Latest in physics.optics

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In-phase and anti-phase synchronization in a laser frequency combAug 22 2019Coupled clocks are a classic example of a synchronization system leading to periodic collective oscillations. This phenomenon already attracted the attention of Christian Huygens back in 1665,who described it as a kind of "sympathy" among oscillators. ... More
Scanning a focus through scattering media without using the optical memory effectAug 22 2019Wavefront shaping makes it possible to form a focus through opaque scattering materials. In some cases, this focus may be scanned over a small distance using the optical memory effect. However, in many cases of interest, the optical memory effect has ... More
Design Study for Telecom-Wavelength Quantum Light-Sources Based on Hybrid Circular Bragg-GratingsAug 22 2019We present a design study of quantum light sources based on hybrid circular Bragg Gratings (CBGs) for emission wavelengths in the telecom O-band. The evaluated CBG designs show photon extraction efficiencies > 95% and Purcell factors close to 30. Using ... More
Tunable Birefringence in Silica Mediated Magnetic FluidAug 22 2019The present study reports magnetic and optical properties of silica mediated lauric acid stabilized magnetic fluids. The tunable birefringence ({\Delta}n) and other properties are investigated as a function of (i) concentrations of silica suspension, ... More
The role of surface depletion layer effects on the enhancement of the UV emission in ZnO induced by a nanostructured Al surface coatingAug 22 2019The UV enhancement of Al-coated ZnO single crystals with a wide range of carrier densities is systematically studied using depth-resolved cathodoluminescence (CL) and photoluminescence (PL) as well as valence band X-ray photoemission spectroscopy (VB-XPS). ... More
Nonreciprocal transition between two nondegenerate energy levelsAug 22 2019Stimulated emission and absorption are two fundamental processes of light-matter interaction, and the coefficients of the two processes should be equal in general. However, we will describe a generic method to realize significant difference between the ... More
Direct observation of the spin-orbit coupling interaction in ring-core optical fibersAug 22 2019Ring-core optical fibers have been designed to carry orbital angular momentum modes. We demonstrate the imaging of these modes, individually identifying modes separated temporally by only 30~ps. A single-pixel camera operating in the short-wave infrared ... More
Dynamical behaviour of coupled atom-cavity systems in the single excitation limitAug 22 2019We investigate the time evolution of the photon-detection probability at various output ports of an all-fiber coupled cavity-quantum-electrodynamics (cavity-QED) system. The setup consists of two atoms trapped separately in the field of two nanofiber ... More
Spatial and Temporal fluctuation of an ABP in an optical trapAug 22 2019Active colloidal systems contain active particle, which converts energy from the environment into directed or persistent motion. An outstanding question, debated to date, pertains to how a quantitative and well-defined means can be established to quantify ... More
Large-Angle, Broadband and Multifunctional Gratings Based on Directively Radiating Waveguide ScatterersAug 21 2019Conventional surface-relief gratings are inefficient at deflecting normally-incident light by large angles. This constrains their use in many applications and limits the overall efficiency of any optical instrument integrating gratings. Here, we demonstrate ... More
Rotational Doppler cooling and heatingAug 21 2019Doppler cooling is a widely used technique to laser cool atoms and nanoparticles exploiting the Doppler shift involved in translational transformations. The rotational Doppler effect arising from rotational coordinate transformations should similarly ... More
Ultra-thin, entirely flat, Umklapp lensesAug 21 2019We design ultra-thin, entirely flat, dielectric lenses using crystal momentum transfer, so-called Umklapp processes, achieving the required wave control for a new mechanism of flat lensing; physically, these lenses take advantage of abrupt changes in ... More
Random Mode Coupling Assists Kerr Beam Self-Cleaning in a Graded-Index Multimode Optical FiberAug 21 2019In this paper, we numerically investigate the process of beam self-cleaning in a graded-index multimode optical fiber, by using the coupled-mode model. We introduce various models of random linear coupling between spatial modes, including coupling between ... More
Generation and characterization of few-pulse attosecond pulse trains at 100kHz repetition rateAug 21 2019Many experiments in attosecond science will benefit from attosecond pulses at high repetition rates with sufficient photon flux for pump-probe experiments. We use 7fs, 800nm pulses from a non-collinear optical parametric chirped pulse amplification (NOPCPA) ... More
Probing non-Hermitian Skin Effect and non-Bloch Phase TransitionsAug 21 2019In non-Hermitian crystals showing the non-Hermitian skin effect, ordinary Bloch band theory and Bloch topological invariants fail to correctly predict energy spectra, topological boundary states, and symmetry breaking phase transitions in systems with ... More
Depth thermography: non-invasive 3D temperature profiling using infrared thermal emissionAug 21 2019We introduce a technique based on infrared thermal emission, termed depth thermography, that can remotely measure the temperature distribution beneath the surface of certain objects. Depth thermography utilizes the thermal-emission spectrum in the semitransparent ... More
Hot exciton transport in WSe2 monolayersAug 20 2019We experimentally demonstrate hot exciton transport in h-BN encapsulated WSe2 monolayers via spatially and temporally resolved photoluminescence measurements at room temperature. We show that the nonlinear evolution of the mean squared displacement of ... More
Light diffusion in birefringent polycrystals and the IceCube ice anisotropyAug 20 2019The IceCube Neutrino Observatory instruments about 1 km^3 of deep, glacial ice at the geographic South Pole with 5160 photomultipliers to detect Cherenkov light from charged relativistic particles. The experiment pursues a wide range of scientific questions ... More
Unitary Light-2D matter Interaction and Universal Absorption in a Monolayer $\mbox{WS}_2$ Van der Waals Heterostructure CavityAug 20 2019A direct bandgap and large exciton binding energies provide an optical response dominated by excitons in monolayer transition-metal-dichalcogenides (TMDs). While various approaches have been applied to light-exciton interaction in TMDs, the achieved strength ... More
Near-unity Light Absorption in a Monolayer $\mbox{WS}_2$ Van der Waals Heterostructure CavityAug 20 2019Aug 22 2019A direct bandgap and large exciton binding energies provide an optical response dominated by excitons in monolayer transition-metal-dichalcogenides (TMDs). While various approaches have been applied to light-exciton interaction in TMDs, the achieved strength ... More
Improving indistinguishability of single photons from colloidal quantum dots using nanocavitiesAug 20 2019Colloidal quantum dots have garnered active research interest as quantum emitters due to their robust synthesis process and straightforward integration with nanophotonic platforms. However, obtaining indistinguishable photons from the colloidal quantum ... More
Cylindrical vector beam generator using a two-element interferometerAug 20 2019We realize a robust and compact cylindrical vector beam generator which consists of a simple two-element interferometer composed of a beam displacer and a cube beamsplitter. The interferometer operates on the higher-order Poincare sphere transforming ... More
Measuring the Faraday effect in olive oil using permanent magnets and Malus' lawAug 20 2019We present a simple permanent magnet set-up that can be used to measure the Faraday effect in gases, liquids and solids. By fitting the transmission curve as a function of polarizer angle (Malus' law) we average over fluctuations in the laser intensity ... More
Single-shot carrier-envelope-phase measurement in ambient airAug 20 2019The ability to measure and control the carrier envelope phase (CEP) of few-cycle laser pulses is of paramount importance for both frequency metrology and attosecond science. Here, we present a phase meter relying on the CEP-dependent photocurrents induced ... More
Li4Ti5O12: A Visible-to-Infrared Broadband Electrochromic Material for Optical and Thermal ManagementAug 20 2019Broadband electrochromism from visible to infrared wavelengths is attractive for applications like smart windows, thermal-camouflage, and temperature control. In this work, the broadband electrochromic properties of Li4Ti5O12 (LTO) and its suitability ... More
Optomechanical refrigeration via multi-mode cold-damping feedbackAug 20 2019We provide a fully analytical treatment for the partial refrigeration of the thermal motion of a quantum mechanical resonator under the action of feedback. As opposed to standard cavity optomechanics where the aim is to isolate and cool a single mechanical ... More
Quantum synchronization and correlation in bidirectionally and unidirectionally coupled optomechanical oscillatorsAug 20 2019Optically coupled optomechanical oscillators has turned out to be a versatile experimental resource for exploring optomechanical synchronizations and correlations. In this work, we investigate the phenomena of quantum synchronization and quantum correlations ... More
Determination of Electron Band Structure using Temporal InterferometryAug 20 2019We propose an all-optical method to directly reconstruct the band structure of semiconductors. Our scheme is based on the temporal Young's interferometer realized by high harmonic generation (HHG) with a few-cycle laser pulse. As a time-energy domain ... More
Wavelength-scale errors in optical localization due to spin-orbit coupling of lightAug 20 2019The precise determination of the position of point-like emitters and scatterers using far-field optical imaging techniques is of utmost importance for a wide range of applications in medicine, biology, astronomy, and physics. Although the optical wavelength ... More
Strong Mechanical Squeezing for a Levitated Particle by Coherent ScatteringAug 20 2019Levitated particles are a promising platform for precision sensing of external perturbations and probing the boundary between quantum and classical worlds. A critical obstacle for these applications is the difficulty of generating nonclassical states ... More
Experimental demonstration of Cavity-Free Optical Isolators and Optical CirculatorsAug 20 2019Cavity free optical non reciprocity components, which have an inherent strong asymmetric interaction between their co and counter propagation direction, are key to produce such as optical isolators and circulators. According to the proposal presented ... More
Extremely high-aspect-ratio ultrafast Bessel beam generation and stealth dicing of multi-millimeter thick glassAug 20 2019We report on the development of an ultrafast beam shaper capable of generating Bessel beams of high cone angle that maintain a high-intensity hot spot with subwavelength diameter over a propagation distance in excess of 8~mm. This generates a high-intensity ... More
Resonant-state expansion for planar photonic-crystal structuresAug 19 2019We present a new paradigm in the field of photonic crystals and metamaterials, applying the resonant-state expansion (RSE) to planar photonic-crystal structures. The RSE allows us to understand and quantify optical resonances in photonic-crystal structures ... More
Broadband mid-infrared perfect absorber using fractal Gosper curveAug 19 2019Aug 20 2019Designing broadband metamaterial perfect absorbers is challenging due to the intrinsically narrow bandwidth of surface plasmon resonances. Here, the paper reports an ultra-broadband metamaterial absorber by using space filling Gosper curve. The optimized ... More
Broadband mid-infrared perfect absorber using fractal Gosper curveAug 19 2019Designing broadband metamaterial perfect absorbers is challenging due to the intrinsically narrow bandwidth of surface plasmon resonances. Here, the paper reports an ultra-broadband metamaterial absorber by using space filling Gosper curve. The optimized ... More
Breakdown of Raman Selection Rules By Fröhlich Interaction in Few-Layer WS$_2$Aug 19 2019The Raman selection rules arise from the crystal symmetry and then determine the Raman activity and polarization of scattered phonon modes. However, these selection rules can be broken in resonant process due to the strong electron-phonon coupling effect. ... More
Ultraviolet to Near-infrared Single Photon Emitters in hBNAug 19 2019In the field of quantum photon sources, single photon emitter from solid is of fundamental importance for quantum computing, quantum communication, and quantum metrology. However, it has been an ultimate but seemingly distant goal to find the single photon ... More
Ultraviolet to Near-infrared Single Photon Emitters in hBNAug 19 2019Aug 20 2019In the field of quantum photon sources, single photon emitter from solid is of fundamental importance for quantum computing, quantum communication, and quantum metrology. However, it has been an ultimate but seemingly distant goal to find the single photon ... More
Ultraviolet to Near-infrared Single Photon Emitters in hBNAug 19 2019Aug 21 2019In the field of quantum photon sources, single photon emitter from solid is of fundamental importance for quantum computing, quantum communication, and quantum metrology. However, it has been an ultimate but seemingly distant goal to find the single photon ... More
High-Speed Phase-Only Spatial Light Modulators with Two-Dimensional Tunable Microcavity ArraysAug 18 2019Spatial light modulators (SLMs) are central to numerous applications ranging from high-speed displays to adaptive optics, structured illumination microscopy, and holography. After decades of advances, SLM arrays based on liquid crystals can now reach ... More
Quantum light propagation in a uniformly moving dissipative slabAug 18 2019Within the framework of a phenomenological quantization scheme, we present the quantization of the electromagnetic field in the presence of a moving absorptive and dispersive magneto-dielectric slab (MDS) with uniform velocity in the direction parallel ... More
Spacing gain and absorption in a simple $\mathcal{PT}$-symmetric model: spectral singularities and ladders of eigenvalues and resonancesAug 18 2019We consider a parity-time ($\mathcal{PT}$-) symmetric waveguide consisting of a localized gain and loss elements separated by a variable distance. The situation is modelled by a Schr\"odiner operator with localized complex $\mathcal{PT}$-symmetric potential. ... More
Enhanced stability, bistability, and exceptional points in saturable active photonic couplersAug 17 2019A generic photonic coupler with active and lossy parts, gain saturation and asymmetric characteristics is examined. Saturable activity is shown to be able to enhance the overall stability of the steady states, prevent evolution to undesirable unbounded ... More
Third method for generation of spectral holes in chiral sculptured thin filmsAug 17 2019The introduction of either a central layer defect or a central twist defect in a periodic structurally chiral material generates circular-polarization-sensitive spectral holes in the remittance spectrums for normally incident plane waves. We propose and ... More
Coherent interaction between free electrons and cavity photonsAug 16 2019Since its inception, research of cavity quantum electrodynamics (CQED) has extended our understanding of light-matter interactions and our ability to utilize them. Thus far, all the work in this field has been focused on light interacting with bound electron ... More
Multimode Fiber Coupled Superconducting Nanowire Single Photon Detectors with High Detection Efficiency and Time ResolutionAug 16 2019In the past decade superconducting nanowire single photon detectors (SNSPDs) have gradually become an indispensable part of any demanding quantum optics experiment. Until now, most SNSPDs are coupled to single-mode fibers. SNSPDs coupled to multimode ... More
Ballistic Supercavitating Nano Swimmer Driven by Single Gaussian Beam Optical Pushing and Pulling ForcesAug 16 2019Directed high-speed motion of nanoscale objects in fluids (nano swimmers) can have a wide range of applications like molecular machinery, nano robotics, drug delivery, and material assembly. Here, we report ballistic plasmonic Au nanoparticle (NP) swimmers ... More
Controlling single-photon scattering in a rectangular waveguide by a V-type three-level emitterAug 16 2019The single-photon scattering in a rectangular waveguide by a V-type three-level emitter is studied for large range of input-photon energy beyond the single-mode region. By using Lippmann-Schwinger formalism, the necessary and sufficient conditions of ... More
Fresnel drag in space-time modulated metamaterialsAug 16 2019A moving medium drags light along with it as measured by Fizeau and explained by Einstein's theory of special relativity. Here we show that the same effect can be obtained in a situation where there is no physical motion of the medium. Modulations of ... More
Correlative Study of Enhanced Excitonic Emission in ZnO Coated with Al Nanoparticles using Electron and Laser ExcitationAug 16 2019Metal nanoparticle (NP) surface coatings are known to significantly enhance the ultra-violet luminescence intensity of ZnO. Although there is general agreement that resonantly excited Localized Surface Plasmons (LSPs) in metal NPs can directly couple ... More
Universal momentum-to-real-space mapping of topological singularitiesAug 15 2019Topological properties of materials, as manifested in the intriguing phenomena of quantum Hall effect and topological insulators, have attracted overwhelming transdisciplinary interest in recent years. Topological edge states, for instance, have been ... More
Controlling branching angle of waveguide splitters based on GRIN lensesAug 15 2019Designing beam splitting structures with wide branching angles is of great significance. The branching angle of conventional Y-junctions is limited. In this paper, we investigate the possibility of utilizing gradient index (GRIN) lenses with two focal ... More
Exciting Pseudospin Dependent Edge States in Plasmonic MetasurfacesAug 15 2019We study a plasmonic metasurface that supports pseudospin dependent edge states confined at a subwavelength scale, considering full electrodynamic interactions including retardation and radiative effects. The spatial symmetry of the lattice of plasmonic ... More
Non-stationary Statistics and Formation Jitter in Transient Photon CondensationAug 15 2019While equilibrium phase transitions are well described by a free-energy landscape, there are few tools to describe general features of their non-equilibrium counterparts. On the other hand, near-equilibrium free-energies are easily accessible but their ... More
Enhancing the speed and sensitivity of a nonlinear optical sensor with noiseAug 15 2019We demonstrate how noise can be turned into an advantage for optical sensing using a nonlinear cavity. The cavity is driven by a continuous wave laser into the regime of optical bistability. Due to the influence of fluctuations, the cavity randomly switches ... More
Four-wave Mixing of Topological Edge Plasmons in Graphene MetasurfacesAug 15 2019We study topologically-protected four-wave mixing (FWM) interactions in a plasmonic metasurface consisting of a periodic array of nanoholes in a graphene sheet, which exhibits a wide topological bandgap at terahertz frequencies upon the breaking of time-reversal ... More
Non-reciprocity using quadrature-phase time-varying slab resonatorsAug 14 2019In this paper, it is shown that non-reciprocity can be observed in time-varying media without employing spatio-temporal modulated permittivities. We show that by using only two one dimensional Fabry-Perot slabs with time-periodic permittivities having ... More
On-axis diffraction-limited design of bi-parabolic singlet lensesAug 14 2019A lens limited by diffraction and having two parabolic surfaces is presented. The knowledge of the following parameters: object distance, relative refractive index, lens thickness, and image distance, enables to analytically calculate the parabolic front ... More
Three-dimensional Near-field Anatomy Reveals Geometric Resonance of Hyperbolic Phonon Polariton Micro-StructuresAug 14 2019Standing waves of defined momentum arise when the propagating wave is confined by finite boundaries of suitable dimensions and symmetry. Phonon polaritons, often supported by two-dimensional materials, are waves formed from hybridization of collective ... More
Breach of symmetries in rotating arrays and metamaterials observed in their rest frameAug 14 2019Polarizability theory and discrete dipole approximation in a rotating medium rest-frame is developed and discussed. The analysis is based on a rigorous rotating medium Green's function, and is used to study the effect of rotation on various arrays and ... More
Quantum Emergence of Linear Particle Accelerator and Anomalous Photon-induced Near-field Electron Microscopy in a Strong Coupling RegimeAug 14 2019Photon-induced near-field electron microscopy (PINEM) is a currently developing spectral approach that characterizes quantum electron-light interactions in electron energy gain/loss spectrum, with symmetrically discretized gains or losses of light quanta ... More
Visible blue-to-red 10 GHz frequency comb via on-chip triple-sum frequency generationAug 14 2019A broadband visible blue-to-red, 10 GHz repetition rate frequency comb is generated by combined spectral broadening and triple-sum frequency generation in an on-chip silicon nitride waveguide. Ultra-short pulses of 150 pJ pulse energy, generated via electro-optic ... More
Motional Sideband Asymmetry of a Nanoparticle Optically Levitated in Free SpaceAug 14 2019The hallmark of quantum physics is Planck's constant $h$, whose finite value entails the quantization that gave the theory its name. The finite value of $h$ gives rise to inevitable zero-point fluctuations even at vanishing temperature. The zero-point ... More
Optical fingerprint of bright and dark localized excitonic states in atomically thin 2D materialsAug 14 2019Point defects, local strain or impurities can crucially impact the optical response of atomically thin two-dimensional materials as they offer trapping potentials for excitons. These trapped excitons appear in photoluminescence spectra as new resonances ... More
Understanding the image contrast of material boundaries in IR nanoscopy reaching 5 nm spatial resolutionAug 14 2019Scattering-type scanning near-field optical microscopy (s-SNOM) allows for nanoscale resolved Infrared (IR) and Terahertz (THz) imaging, and thus has manifold applications ranging from materials to biosciences. However, a quantitatively accurate understanding ... More
Optical Black-hole Analog Created by Topological Phase Transition with a Long-lived HorizonAug 14 2019Hawking radiation, a manifestation of quantum field theory in curved spacetime, has stimulated extensive theoretical and experimental studies of various black-hole (BH) analogs. However, an undisputed confirmation of Hawking radiation remains elusive. ... More
Towards Topological Protection based millimetre wave devicesAug 14 2019Feasibility of Topological Metawaveguides supporting helical propagation in the microwave range has been recently proven. The advantages of unidirectional propagation supported by such waveguides however can only be exploited in real devices if topological ... More
Silicon metasurfaces for third harmonic geometric phase manipulation and multiplexed holographyAug 14 2019Nonlinear wavefront control is a crucial requirement in realizing nonlinear optical applications with metasurfaces. Numerous aspects of nonlinear frequency conversion and wavefront control have been demonstrated for plasmonic metasurfaces. However, several ... More
Metasurface interferometry towards quantum sensorsAug 14 2019Optical metasurfaces open new avenues for precise wavefront control of light for integrated quantum technology. Here, we demonstrate a hybrid integrated quantum photonic system that is capable to entangle and disentangle two-photon spin states at a dielectric ... More
Towards Simultaneous Observation of Path and Interference of Single Photon in a Modified Mach-Zehnder InterferometerAug 14 2019Classical wisdom of wave-particle duality says that it is impossible to observe simultaneously the wave and particle nature of microscopic object. Mathematically the principle requests that the interference visibility V and which-path distinguishability ... More
Multimode Lasing in Wave-Chaotic Semiconductor MicrolasersAug 14 2019We investigate experimentally and theoretically the lasing behavior of dielectric microcavity lasers with chaotic ray dynamics. Experiments show multimode lasing for both D-shaped and stadium-shaped wave-chaotic cavities. Theoretical calculations also ... More
Photochemical Upconversion Theory: Importance of Triplet Energy Levels and Triplet QuenchingAug 14 2019Photochemical upconversion is a promising way to boost the efficiency of solar cells using triplet exciton annihilation. Currently, predicting the performance of photochemical upconversion devices is challenging. We present an open source software package ... More
Generative Multi-Functional Meta-Atom and Metasurface Design NetworksAug 13 2019Metasurfaces are being widely investigated and adopted for their promising performances in manipulating optical wavefronts and their potential for integrating multi-functionalities into one flat optical device. A key challenge in metasurface design is ... More
Inelastic scattering of photon pairs in qubit arrays with subradiant statesAug 13 2019We develop a rigorous theoretical approach for analyzing inelastic scattering of photon pairs in arrays of two-level qubits embedded in a waveguide. Our analysis reveals strong enhancement of the scattering when the energy of incoming photons resonates ... More
Towards infrared toroidal photodevices: A ReviewAug 13 2019Plasmon excitations in metallic nanostructures can decay directly into dynamic electron-hole pairs (EHPs), exploitable for photocurrent generation. This approach has extensively been employed to develop nanoplasmonic light-sensing devices with significant ... More
On-chip directional octave-spanning supercontinuum generation from high order mode in near ultraviolet to infrared spectrum using AlN waveguidesAug 13 2019On-chip ultraviolet to infrared (UV-IR) spectrum frequency metrology is of crucial importance as a characterization tool for fundamental studies on quantum physics, chemistry, and biology. Due to the strong material dispersion, traditional techniques ... More
Photoexcitation of PbS Nanosheets Leads to Highly Mobile Charge Carriers and Stable ExcitonsAug 13 2019Solution-processable two-dimensional (2D) semiconductors with chemically tunable thickness and associated tunable band gaps are highly promising materials for ultrathin optoelectronics. Here, the properties of free charge carriers and excitons in 2D PbS ... More
Frequency combs in a microring optical parametric oscillatorAug 13 2019We report the soliton frequency comb generation in microring optical parametric oscillators operating in the down-conversion regime and with the simultaneous presence of the $\chi^{(2)}$ and Kerr nonlinearities. The combs are studied considering a typical ... More
An Analytical and Rigorous Method for Analysis of an Array of Magnetically-Biased Graphene RibbonsAug 13 2019A sheet of graphene under magnetic bias attains anisotropic surface conductivity, opening the door for realizing compact devices such as Faraday rotators, isolators and circulators. In this paper, an accurate and analytical method is proposed for a periodic ... More
Nanoparticles manipulation in 3D nanotips excited with plasmonic vortexAug 13 2019Aug 15 2019Recent advances in nanotechnologies have prompted the need for tools to accurately and non invasively manipulate individual nanoobjects. Among the possible strategies, optical forces have been widely used to enable nano optical tweezers capable of trapping ... More
Nanoparticles manipulation in 3D nanotips excited with plasmonic vortexAug 13 2019Recent advances in nanotechnologies have prompted the need for tools to accurately and non invasively manipulate individual nanoobjects. Among the possible strategies, optical forces have been widely used to enable nano optical tweezers capable of trapping ... More
CPA-laser effect and exceptional points in PT-symmetric multilayer structuresAug 13 2019The simultaneous existence of coherent perfect absorption (CPA) and lasing is one of the most intriguing features of non-Hermitian photonics. However, the link between CPA lasing and PT symmetry breaking at the exceptional point (EP) needs clarification. ... More
On-chip label-free biosensing based on active whispering gallery mode resonators pumped by a light-emitting diodeAug 13 2019Biosensing based on whispering-gallery mode (WGM) resonators has been continuously studied with great attention due to its excellent sensitivity guaranteeing the label-free detection. However, its practical impact is insignificant to date despite notable ... More
Realization of complex conjugate media using pseudo-HermiticityAug 13 2019Pseudo-Hermitian systems possessing an antilinear symmetry can exhibit a real spectrum in the symmetry-exact phase. Here we show that to achieve pseudo-Hermiticity in photonic crystals, the average non-Hermiticity strength within the unit cell for the ... More
Synthetic gauge field in a single optomechanical resonatorAug 13 2019Synthetic gauge fields have recently emerged, arising in the context of quantum simulations, topological matter, and the protected transportation of excitations against defects. For example, an ultracold atom experiences a light-induced effective magnetic ... More
How Perfect are Perfect Vortex Beams?Aug 12 2019Perfect (optical) vortex (PV) beams are fields which are mooted to be independent of the orbital angular momentum (OAM) they carry. To date, the best experimental approximation of these modes is obtained from passing Bessel-Gaussian beams through a Fourier ... More
Topological Control of Extreme WavesAug 12 2019From optics to hydrodynamics, shock and rogue waves are widespread. Although they appear as distinct phenomena, new theories state that transitions between extreme waves are allowed. However, these have never been experimentally observed because of the ... More
Nonlinear Spectroscopy and All-Optical Switching of Femtosecond Soliton MoleculesAug 12 2019The emergence of confined structures and pattern formation are exceptional manifestations of concurring nonlinear interactions found in a variety of physical, chemical and biological systems[1]. Optical solitons are a hallmark of extreme spatial or temporal ... More
Crystal Symmetry and Polarization of High-order Harmonics in ZnOAug 12 2019We carried out a joint theoretical and experimental study of the polarization of high-order harmonics generated from ZnO by intense infrared laser pulses. Experimentally we found that the dependence of parallel and perpendicular polarizations on the crystal ... More
Coherent control of light for non-line-of-sight imagingAug 12 2019Non-line-of-sight (NLOS) imaging relies on collecting light that is rendered incoherent from the multiple scattering events and is then post-processed to provide an estimate of the hidden scene. Here we employ coherent phase control of the outgoing laser ... More
Impact of photon addition and subtraction on nonclassical and phase properties of a displaced Fock stateAug 12 2019Various nonclassical and quantum phase properties of photon added then subtracted displaced Fock state have been examined systematically and rigorously. Higher-order moments of the relevant bosonic operators are computed to test the nonclassicality of ... More
Plasmonic Heterodyne Spectrometry for Resolving the Spectral Signatures of Ammonia over a 1-5 THz Frequency RangeAug 12 2019We present a heterodyne terahertz spectrometry platform based on plasmonic photomixing, which enables the resolution of narrow spectral signatures of gases over a broad terahertz frequency range. This plasmonic heterodyne spectrometer replaces the terahertz ... More
Microparticle transport networks with holographic optical tweezers and cavitation bubblesAug 12 2019Optical transport networks for active absorbing microparticles are made with holographic optical tweezers. The particles are powered by the optical potentials that make the network and transport themselves via random vapor propelled hops to different ... More
Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systemsAug 11 2019Aug 21 2019Time-varying metasurfaces are emerging as a powerful instrument for the dynamical control of the electromagnetic properties of a propagating wave. Here we demonstrate an efficient time-varying metasurface based on plasmonic nano-antennas strongly coupled ... More
Negative refraction in time-varying, strongly-coupled plasmonic antenna-ENZ systemAug 11 2019Time-varying metasurfaces are emerging as a powerful instrument for the dynamical control of the electromagnetic properties of a propagating wave. Here we demonstrate an efficient time-varying metasurface based on plasmonic nano-antennas strongly coupled ... More
Conformal whispering gallery modes for multiple direction emission designed by polygonal mappingsAug 11 2019Designing anisotropic emission whispering gallery modes (WGMs) via transformation optics have been reported recently. Unidirectional and bidirection emission have been demonstrated in these cavities. However, there is no report on multiple direction light ... More
Optical polarimetry based on geometric phase measurements: unitary Jones matricesAug 11 2019We demonstrate a polarimetry technique based on geometric phase measurements. The technique can be used to obtain either the polarization state of a light beam or the properties of a polarizing optical system. On the one hand, we apply our method to determine ... More
Theory of Optical Nonlocality in Polar DielectricsAug 10 2019Sub-wavelength confinement of mid-infrared light can be achieved exploiting the metal-like optical response of polar dielectric crystals in their Reststrahlen spectral region, where they support evanescent modes termed surface phonon polaritons. In the ... More
Newtonian orbits of nanoparticles interacting with structured light beamsAug 10 2019We perform numerical analysis to study the orbits described by subwavelength size particles interacting with structured light beams. Our solution to the particle dynamics considers: (i) the gradient force, (ii) the radiation pressure, and (iii) the force ... More
Topological photonic integrated circuits based on valley kink statesAug 10 2019Valley pseudospin, a new degree of freedom in photonic lattices, provides an intriguing way to manipulate photons and enhance the robustness of optical networks. Here we experimentally demonstrated topological waveguiding, refracting, resonating, and ... More