A5059288362- Orbital Angular Momentum in Optics
- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Thermal Radiation and Cooling Technologies
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Advanced Fiber Laser Technologies
- Advanced Optical Imaging Technologies
- Laser-Matter Interactions and Applications
- Advanced Antenna and Metasurface Technologies
- Advanced optical system design
- Photorefractive and Nonlinear Optics
- Solid State Laser Technologies
- Optical Polarization and Ellipsometry
- Laser Design and Applications
- Quantum and electron transport phenomena
- Optical measurement and interference techniques
- Neural Networks and Reservoir Computing
- Topological Materials and Phenomena
- Advanced Measurement and Metrology Techniques
- Optical properties and cooling technologies in crystalline materials
- Quantum Electrodynamics and Casimir Effect
- Random lasers and scattering media
Technion – Israel Institute of Technology
2013-2023
Ames National Laboratory
2013
Weizmann Institute of Science
1989-2005
Gradient metasurfaces are two-dimensional optical elements capable of manipulating light by imparting local, space-variant phase changes on an incident electromagnetic wave. These surfaces have thus far been constructed from nanometallic antennas, and high diffraction efficiencies limited to operation in reflection mode. We describe the experimental realization dielectric gradient metasurface also achieving transmission mode visible spectrum. Ultrathin gratings, lenses, axicons realized...
Space-variant Pancharatnam–Berry phase optical elements based on computer-generated subwavelength gratings are presented. By continuously controlling the local orientation and period of grating we can achieve any desired element. We present a theoretical analysis experimentally demonstrate phase-based diffraction for laser radiation at wavelength 10.6 µm.
Spin optics provides a route to control light, whereby the photon helicity (spin angular momentum) degeneracy is removed due geometric gradient onto metasurface. The alliance of spin and metamaterials offers dispersion engineering structured matter in polarization helicity-dependent manner. We show that polarization-controlled optical modes arise where spatial inversion symmetry violated. emerged spin-split spontaneous emission originates from spin-orbit interaction generating selection rule...
Multifunction planar optics Specially designed two-dimensional (2D) arrays of nanometer-scale metallic antennas, or metasurfaces, may allow bulky optical components to be shrunk down a device structure. Khorasaninejad et al. show that nanoscale fins TiO can function as high-end lenses. At just fraction the size objectives, such devices could turn your phone camera contact lens into compound microscope. Maguid interleaved sparse 2D metal antennas get multifunctional behavior from one...
We present a novel method for forming radially and azimuthally polarized beams by using computer-generated subwavelength dielectric gratings. The elements were deposited upon GaAs substrates produced with polarization purity of 99.2% at wavelength 10.6 microm . have verified the properties full space-variant analysis measurement, we show that such certain vortexlike they carry angular momentum.
Quantized Pancharatnam–Berry phase diffractive optics using computer-generated space-variant subwavelength dielectric grating is presented. The formation of the geometrical done by discrete orientation local grating. We discuss a theoretical analysis and experimentally demonstrate quantized blazed polarization diffraction grating, as well dependent focusing lens for infrared radiation at wavelength 10.6 μm.
Observation of surface-plasmon phenomena that are dependent upon the handedness circularly polarized incident light (spin) is presented. The polarization-dependent near-field intensity distribution obtained in our experiment attributed to presence a geometric phase arising from interaction with an anisotropic and inhomogeneous nanoscale structure. A vortex surface mode spin-dependent topological charge was plasmonic microcavity. remarkable phenomenon polarization-sensitive focusing structure...
Going quantum with metamaterials Metasurfaces should allow wafer-thin surfaces to replace bulk optical components. Two reports now demonstrate that metasurfaces can be extended into the regime. Wang et al. determined state of multiple photons by simply passing them through a dielectric metasurface, scattering single-photon detectors. Stav used metasurface generate entanglement between spin and orbital angular momentum single photons. The results aid development integrated optic circuits...
We examine the spin-orbit coupling effects that appear when a wave carrying intrinsic angular momentum interacts with medium. The Berry phase is shown to be manifestation of Coriolis effect in noninertial reference frame attached wave. In most general case, both direction propagation and state are varied, given by simple expression unifies spin redirection Pancharatnam-Berry phase. theory supported experiment demonstrating electromagnetic waves via surface plasmon nanostructure. measurements...
Observation of optical spin Hall effects (OSHEs) manifested by a spin-dependent momentum redirection is presented. The effect occurring solely as result the curvature coupled localized plasmonic chain regarded locally isotropic OSHE, while anisotropic OSHE arises from interaction between and local anisotropy mode rotating along chain. A wavefront phase dislocation was observed in circular curvature, which strength enhanced effect.
Shared-aperture technology for multifunctional planar systems, performing several simultaneous tasks, was first introduced in the field of radar antennas. In photonics, effective control electromagnetic response can be achieved by a geometric-phase mechanism implemented within metasurface, enabling spin-controlled phase modulation. The synthesis shared-aperture and concepts facilitates generation metasurfaces. Here metasurfaces were realized via interleaving sparse antenna sub-arrays,...
Abstract Structured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields inhomogeneous cannot be approximated by a single plane wave. Even interference two waves, or (evanescent) wave, provides number nontrivial phenomena additional functionalities as compared to Complex with inhomogeneities in amplitude, phase, polarization, including topological structures singularities, underpin modern nanooptics photonics, yet they equally important, e.g....
We report the appearance of a geometrical phase in space-variant polarization-state manipulations. This is related to classic Pancharatnam-Berry phase. show method with which calculate it and experimentally demonstrate its effect, using subwavelength metal stripe gratings. The experiment based on unique grating for converting circularly polarized light at wavelength 10.6 mum into an azimuthally beam. Our experimental evidence relies analysis far-field images resultant polarization.
Laser resonator configurations for obtaining pure azimuthal and radial polarized beams are presented. They involve the coherent summation, inside laser resonator, of two orthogonally TEM01 modes. Basic principles experimental results with a Nd:YAG The include full space variant polarization measurement show efficient formation high-quality beams.
Spiral phase elements with topological charges based on space-variant Pancharatnam-Berry optical are presented. Such can be achieved by use of continuous computer-generated subwavelength dielectric gratings. We present a theoretical analysis and experimentally demonstrate spiral geometrical phases for infrared radiation at wavelength 10.6microm .
We report a novel aspheric holographic optical element, the axilens, for achieving extended focal depth while keeping high lateral resolution. The element is designed according to special optimization techniques and recorded as computer-generated hologram. results specific which has of focus 30 mm, resolution 80 μm, length 1250 diameter 12.5 mm at wavelength 633 nm, are presented.
We examine, both experimentally and theoretically, an interaction of tightly focused polarized light with a slit on metal surface supporting plasmon-polariton modes. Remarkably, this simple system can be highly sensitive to the polarization incident offers perfect quantum-weak-measurement tool built-in post-selection in mode. observe plasmonic spin Hall effect coordinate momentum spaces which is interpreted as weak measurements helicity real imaginary values determined by input polarization....
Linearly polarized vectorial vortices are analyzed according to their Pancharatnam phase and experimentally demonstrated using a geometric element consisting of space-variant subwavelength gratings. It is shown that in the absence phase, stable have no angular momentum arise. In contrast, if present orbital collapse upon propagation.
Observation of a spin symmetry breaking effect in plasmonic nanoscale structures due to spin-orbit interaction is presented. We demonstrate nanoplasmonic structure which exhibits crucial role an angular momentum (AM) selection rule light-surface plasmon scattering process. In our experiment, the intrinsic AM (spin) incident radiation coupled extrinsic (orbital AM) surface plasmons via interaction. Due this effect, we achieved spin-controlled enhanced transmission through coaxial nanoaperture.
Metasurfaces provide unprecedented control over light propagation by imparting local, space-variant phase changes on an incident electromagnetic wave. They can improve the performance of conventional optical elements and facilitate creation components with new functionalities form factors. Here, we build knowledge from shared aperture phased array antennas Si-based gradient metasurfaces to realize various multifunctional capable achieving multiple distinct functions within a single surface...
We present omnidirectional near-unity absorption of light in an ultrathin planar semiconductor layer on a metal substrate. Using full-field simulations and modal analysis, it is shown that more than 98% the incident energy can be absorbed mere 12 nm thick Ge Ag substrate at wavelength 625 over wide range angles (80% up to 66° transverse magnetic 67° electric polarizations). The physical origin such remarkable properties coupling Brewster mode supported by structure. dispersion connects...
Photonic gradient metasurfaces are ultrathin electromagnetic wave-molding metamaterials that provide a route for realizing flat optics. However, the up-to-date metasurface design, manifested by imprinting required phase profile single, on-demand light manipulation functionality, is not compatible with desired goal of multifunctional Here, we report on generic concept to control optics disordered (random) custom-tailored geometric phase. This approach combines peculiar ability random patterns...
We present a unique method for converting circularly polarized light into radially and azimuthally beams. The is based on the use of computer-generated space-variant subwavelength metal stripe gratings. elements were realized GaAs substrates produced beams with high polarization purity at wavelength 10.6 μm. As result conversion, also undergo phase modification, which has an effect their propagation. demonstrate experimentally, calculate it using full analysis rigorous coupled-wave Jones calculus.
Propagation-invariant vectorial Bessel beams with linearly polarized axial symmetry based on quantized Pancharatnam-Berry phase optical elements are described. The geometric is formed through the use of discrete computer-generated space-variant subwavelength dielectric gratings. We have verified polarization properties our for laser radiation at 10.6-microm wavelength and also demonstrated propagation-invariant, controlled rotation a propeller-shaped intensity pattern simple polarizer.