A5045376945- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Topological Materials and Phenomena
- Nonlinear Optical Materials Studies
- Laser-Matter Interactions and Applications
- Photorefractive and Nonlinear Optics
- Polydiacetylene-based materials and applications
- Advanced Fluorescence Microscopy Techniques
- Magneto-Optical Properties and Applications
- Transition Metal Oxide Nanomaterials
- Strong Light-Matter Interactions
- Terahertz technology and applications
- Quantum optics and atomic interactions
- Polymer Nanocomposites and Properties
- Optical Coherence Tomography Applications
- Neural Networks and Reservoir Computing
- Testicular diseases and treatments
- Mechanical and Optical Resonators
- High voltage insulation and dielectric phenomena
- Random lasers and scattering media
- Dielectric materials and actuators
- Advanced Biosensing Techniques and Applications
Australian National University
2020-2024
Indian Institute of Technology Delhi
1991-2020
Hebrew University of Jerusalem
2019
Dielectric metasurfaces have become efficient tools for creating ultrathin optical components with various functionalities imaging, holography, quantum optics, and topological photonics. While static all-dielectric resonant metaphotonics is reaching maturity, challenges remain in the design fabrication of reconfigurable tunable metasurface structures. A promising pathway toward by incorporating phase-transition materials into photonic structure design. Here we demonstrate Mie-resonant...
The study of topological phases light underpins a promising paradigm for engineering disorder-immune compact photonic devices with unusual properties. Combined an optical gain, structures provide novel platform micro- and nanoscale lasers, which could benefit from nontrivial band topology spatially localized gap states. Here, we propose demonstrate experimentally active nanophotonic cavities incorporating III-V semiconductor quantum wells as gain medium in the structure. We observe...
We study active dielectric metasurfaces composed of two-dimensional arrays split-nanodisk resonators fabricated in InGaAsP membranes with embedded quantum wells. Depending on the geometric parameters, such can operate optical anapole regime originating from an overlap electric dipole and toroidal Mie-resonant modes, thus supporting strongly localized fields high-Q resonances. demonstrate room-temperature lasing lattices engineered low threshold high coherence.
Higher-order optical harmonics entered the realm of nanostructured solids being observed recently in gratings and metasurfaces with a subwavelength thickness. Structuring materials at scale allows us toresonantly enhance efficiency nonlinear processes reduce size high-harmonic sources. We report observation up to seventh harmonic generated from single resonator made AlGaAs material. This process is enabled by careful engineering geometry for supporting an mode associated quasi-bound state...
Abstract Nonlinear structured illumination microscopy (nSIM) is an effective approach for super-resolution wide-field fluorescence with a theoretically unlimited resolution. In nSIM, carefully designed, highly-contrasted patterns are combined the saturation of optical transition to enable sub-diffraction imaging. While technique proved useful two-dimensional imaging, extending it three-dimensions challenging due fading organic fluorophores under intense cycling conditions. Here, we present...
Abstract Optical nonreciprocity is manifested as a difference in the transmission of light for opposite directions excitation. Nonreciprocal optics traditionally realized with relatively bulky components such optical isolators based on Faraday rotation, hindering miniaturization and integration systems. Here we demonstrate free-space nonreciprocal through metasurface comprised two-dimensional array nanoresonators made silicon hybridized vanadium dioxide (VO 2 ). This effect arises from...
<title>Abstract</title> Vibrational spectroscopy is a powerful tool for spectral imaging of biological samples, thanks to its narrow bandwidth (10 cm⁻¹) compared fluorescence. Single-molecule vibrational has been demonstrated with near-field amplification as in surface-enhanced Raman or fluorescence detection stimulated excited and bond-selective fluorescence-detected infrared-excited spectro-microscopy. However, these methods involve complex sample preparation produce high backgrounds,...
We demonstrate the effect of spin-momentum locking upconversion photoluminescence emitted from rare-earth doped nanocrystals coupled to a phase-gradient dielectric metasurface. observe different directionalities for left and right circular polarized light associate this experimental observation with photonic Rashba realized upconverted that is manifested in spin-dependent splitting momentum space.
Abstract Objectives Rare-earth-doped nanocrystals are emerging light sources that can produce tunable emissions in colours and lifetimes, which has been typically achieved chemistry material science. However, one important optical challenge – polarization of photoluminescence remains largely out control by methods. Control over be gained via coupling emitters to resonant nanostructures such as antennas metasurfaces. the resulting is sensitive position disorder emitters, difficult mitigate....
Multiphoton processes of absorption photoluminescence have enabled a wide range applications including three-dimensional microfabrication, data storage, and biological imaging. While the two-photon three-photon luminescence matured considerably, higher-order remain more challenging to study due their lower efficiency, particularly in subwavelength systems. Here, we report observation five-photon from single nanoantenna at room temperature by Mie resonances. We excite an AlGaAs resonator...
We demonstrate nonreciprocal one-way transmission through a half-a-micron-thick nonlinear silicon-VO 2 metasurface for low-power CW excitation. Reciprocity is broken by optically self-induced phase transition of VO occurring at different intensities the opposite directions illumination.
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We demonstrate nonreciprocal one-way transmission through a half-a-micron-thick nonlinear silicon-VO 2 metasurface for low-power CW excitation. Reciprocity is broken by optically self-induced phase transition of VO occurring at different intensities the opposite directions illumination.
We fabricate nanophotonic topological cavities incorporating III-V semiconductor quantum wells and observe room-temperahrre lasing with narrow spectrum, high coherence, threshold behavior. The emitted beam hosts a singularity encoded by the specific triade cavity mode.
We design and fabricate individual subwavelength AlGaAs nanoantennas supporting Mie resonances in the mid-infrared spectral range. Near resonant modes, we observe five-photon upconversion photoluminescence visible
We study multiphoton photoluminescence from several types of nonlinear resonant metaphotonic structures. develop a general theoretical approach to describe such effects and confirm our predictions in experiments with perovskite metasurfaces AlGaAs nanoantennas.
We generate up to the 7 th optical harmonic from a single AlGaAs resonator. The resonator hosts engineered modes associated with bound states in continuum. investigate both direct and cascade mechanisms of high generation.
We combine the concepts of engineering efficiency light trapping (meta-photonics) and those matter interaction (engineering gain media) to demonstrate functioning active nanophotonic devices like lasers, sources, switchable devices.
We show topology-controlled polarization of photoluminescence from rare-earth doped nanocrystals using disorder-immune zigzag arrays dielectric nanoparticles. Topological control is verified by comparing emission deposited on trivial and nontrivial
We study active metasurfaces composed of arrays split-nanodisk resonators made InGaAs slab with embedded InGaAsP quantum wells. demonstrate lasing from high-Q localized anapole modes high coherence, narrow linewidth, and low threshold.