vladimir kleiner | Technion Israel Institute of Technology (original) (raw)

Papers by vladimir kleiner

We present the incorporation of a metasurface involving spin-orbit interaction phenomenon into a ... more We present the incorporation of a metasurface involving spin-orbit interaction phenomenon into a laser cavity paving the way for the generation of spin-controlled intra-cavity modes with different topologies.

ACS Photonics, Nov 12, 2018

Metasurfaces enable the manipulation of light's disorder strength in a two-dimensional photonic s... more Metasurfaces enable the manipulation of light's disorder strength in a two-dimensional photonic system. Here we report on the spectral interleaving of an ordered and a disordered system within a geometric phase metasurface. The efficiency of prevalent interleaving techniques is limited by the number of functions incorporated within the metasurface. We present a shared-aperture extinction cross-section approach relying on interleaving of spectrally selective nanoantenna arrays, each having a large extinction cross-section, thus allowing to overcome this limitation. Using this approach, we realize a silicon-based spectral interleaving metasurface for spectrum-dependent disguise, holographic tagging, and imaging of a target object. The shared-aperture extinction cross-section concept opens the path for the generation of multiple, efficient, and spectrally resolved functions in a two-dimensional photonic system. The presented order−disorder interleaving approach offers new prospects for the manipulation of light's entropy.

Space-variant polarization manipulation of thermal emission in a narrow spectral-peak is presente... more Space-variant polarization manipulation of thermal emission in a narrow spectral-peak is presented. The emission is attributed to surface phonon-polariton excitation from space-variant subwavelength SiO 2 gratings. We experimentally demonstrated thermal emission in an axially symmetric polarization distribution.

Optics Express, Nov 9, 2018

Metasurfaces facilitate the interleaving of multiple topologies in an ultra-thin photonic system.... more Metasurfaces facilitate the interleaving of multiple topologies in an ultra-thin photonic system. Here, we report on the spectral interleaving of topological states of light using a geometric phase metasurface. We realize that a dielectric spectrally interleaved metasurface generates multiple interleaved vortex beams at different wavelengths. By harnessing the space-variant polarization manipulations that are enabled by the geometric phase mechanism, a vectorial vortex array is implemented. The presented interleaved topologies concept can greatly enhance the functionality of advanced microscopy and communication systems.

Optics Express, Jan 9, 2018

Novel multi-tasking geometric phase metasurfaces were incorporated into a modified degenerate cav... more Novel multi-tasking geometric phase metasurfaces were incorporated into a modified degenerate cavity laser as an output coupler to efficiently generate spin-dependent twisted light beams of different topologies. Multiple harmonic scalar vortex laser beams were formed by replacing the laser output coupler with a shared-aperture metasurface. A variety of distinct wave functions were obtained with an interleaving approach-random interspersing of geometric phase profiles within shared-aperture metasurfaces. Utilizing the interleaved metasurfaces, we generated vectorial vortices by coherently superposing of scalar vortices with opposite topological charges and spin states. We also generated multiple partially coherent vortices by incorporating harmonic response metasurfaces. The incorporation of the metasurface platforms into a laser cavity opens a pathway to novel types of nanophotonic functionalities and enhanced light-matter interactions, offering exciting new opportunities for light manipulation.

Light-Science & Applications, Feb 24, 2017

Shared-aperture technology for multifunctional planar systems, performing several simultaneous ta... more Shared-aperture technology for multifunctional planar systems, performing several simultaneous tasks, was first introduced in the field of radar antennas. In photonics, effective control of the electromagnetic response can be achieved by a geometric-phase mechanism implemented within a metasurface, enabling spin-controlled phase modulation. The synthesis of the shared-aperture and geometric-phase concepts facilitates the generation of multifunctional metasurfaces. Here shared-aperture geometric-phase metasurfaces were realized via the interleaving of sparse antenna sub-arrays, forming Si-based devices consisting of multiplexed geometric-phase profiles. We study the performance limitations of interleaved nanoantenna arrays by means of a Wigner phasespace distribution to establish the ultimate information capacity of a metasurface-based photonic system. Within these limitations, we present multifunctional spin-dependent dielectric metasurfaces, and demonstrate multiple-beam technology for optical rotation sensing. We also demonstrate the possibility of achieving complete real-time control and measurement of the fundamental, intrinsic properties of light, including frequency, polarization and orbital angular momentum.

Multitasking shared-aperture systems have initially emerged as radar phased array antennas. Recen... more Multitasking shared-aperture systems have initially emerged as radar phased array antennas. Recently, the shared-aperture concept has been suggested as a platform for multifunctional optical phased array antennas, accomplished by a reflective metasurface [1]. Metasurfaces consist of metallic or dielectric subwavelength nanoantennas, capable of manipulating light by controlling the local amplitude and phase of an incident electromagnetic wave [2-6]. An effective control of the electromagnetic response can be achieved by a geometric phase mechanism implemented within a metasurface, enabling spin-controlled phase modulation. Shared-aperture geometric phase metasurface (GPM) paves the way for multifunctional nano-optical device. Shared-aperture interleaved phased arrays are formed by the random interspersing of sub-arrays, thus resulting in a device with high flexibility in multifunctional wavefront generation and the angular resolution of the shared aperture. Each sub-array is associated with a specific phase function, sparsely sampled at randomly chosen lattice points. We presented multifunctional spin-dependent dielectric metasurfaces, and demonstrated multiple-beam technology for complete real-time control and measurement of the fundamental intrinsic properties of light, including frequency, polarization, and orbital angular momentum (OAM) [7].

Conference on Lasers and Electro-Optics, 2018

We report on the observation of photonic phase transition emerging from disorder topological defe... more We report on the observation of photonic phase transition emerging from disorder topological defects in geometric phase metasurfaces. Low defect concentration induces isolated vortices, whereas high disorder leads to a random vortex interaction.

We report on photonic spin-symmetry breaking and unexpected optical transport phenomena arising f... more We report on photonic spin-symmetry breaking and unexpected optical transport phenomena arising from disordered geometric phase structures. Weak disorder induces a photonic spin Hall effect, whereas strong disorder leads to a random Rashba effect.

Optics & Photonics News, Dec 1, 2016

Light stripe triangulation configuration based an a colorcoded arrangement allows parallcl. fast,... more Light stripe triangulation configuration based an a colorcoded arrangement allows parallcl. fast, real-time 3-D surface profilameby with an extended depth-measuring range and high axial and lateral remlution"'. The methd exploils polychromatic illumination and a eylindneal element that disperse the incident light along the axis, leading to an increased depth-measuring range without any decrease in the axial or the lateral resolution. In ourrecent experimend'l the cylindrical element was a combined dimactive-refractive optical elcment in which many light stripes, wch of a different wavelengch, are simultaneously focused at different focal lengths, farming a rainbow light sheet. The diserimination of each color stripe was funher impmved by a color decoding technique, in which a spectral filter simultaneously matched the entin wavelength distribution of the light shcct during detection. A 20-fold increase in the depth of focus was experimcnlally obtained, while diffraction-limited light stripes with extremely small sidelober were completcly maintained. To test the optical resolution, we performed a series of me&surements on a flat object. placed at an angle which is shown in Figure 1. The mi dcviatioo of the measured result from the expected linear line was IO' optimal resolvieg depul can be obtained. Figure 2 demonstrates fur example, B 3-D sulfaco topography ora RF aluminum antenna plate which w& obtained by om calor-coded optical profilometer.

Over the past decades, topology has provided unique insights into numerous physical phenomena [1,... more Over the past decades, topology has provided unique insights into numerous physical phenomena [1, 2]. Here, we report on observation of spin-enabled photonic transport induced by creation of bound vortex pairs (VPs) and unbound vortices from geometric phase metasurfaces (GPMs). The GPM is consisted of anisotropic nanoantennas oriented in an on-demand profile, providing vast opportunities to observe intriguing physical phenomena such as topological defects (TDs) [3], multiple wave-front shaping [4], photonic transition [5], and single photon entanglement [6]. We achieve topological behaviour by randomly inserting geometrical phase defects into the GPM system with different concentrations (Fig.1 a, b and c). As a result, photonic bound VPs — two closely located TDs with topological charges of +1 and −1 — are observed in the near field of the metasurfaces by interference patterns (Fig.1 d). The observed number of VPs increases with the defect concentration of metasurfaces, up to a point where the vortices are unbound. The geometric phase induces a spin-orbit interaction, which enables the observation of the photonic spin Hall effect (PSHE) in the bound VPs state and a photonic random Rashba effect in the unbound vortices state. We found that the PSHE originates from a single spin-dependent VP. Therefore, when isolated VPs were randomly aligned in the near field, the spin-deflection in momentum space obeys a simple vector summation rule dictating the orientation of the PSHE from these VPs (Fig. 1 e). A continual increase in the number of VPs resulted in random phase fluctuations — the proliferation of unbound vortices. Accordingly, the momentum space is manifested by numerous spin-dependent modes beyond the diffraction limit, until these modes fill the entire momentum space, exhibiting a random Rashba effect.

Geometric phase metasurface (GPM) elements are two dimensional space variant gradient structures,... more Geometric phase metasurface (GPM) elements are two dimensional space variant gradient structures, which enable exotic light manipulation. Such structures consist of a dense assembly of resonant optical nanoantennas, the size parameters and orientation of which dictate local light-matter interactions. The GPM elements have been extensively studied, showing that they can control of the phase, amplitude, polarization and orbital angular momentum of light beams [1-4]. The GPM elements have been used as flat optical elements with unique features, as polarization control elements, and as spectro-polarimetric devices.

We present the alliance of the interleaved phased antenna array and spin-enabled optics of dielec... more We present the alliance of the interleaved phased antenna array and spin-enabled optics of dielectric nanoantennas incorporated within a two-dimensional nanophotonic system, enabling the detection of the fundamental properties of light.

Materials Horizons, 2022

Room-temperature wavelength multiplexing of the two-primary bright excitonic channels (Ab-, Bb-) ... more Room-temperature wavelength multiplexing of the two-primary bright excitonic channels (Ab-, Bb-) in monolayer transition metal dichalcogenides (TMDs) arising from a dark exciton mediated transition.

Nature Nanotechnology, 2020

Conference on Lasers and Electro-Optics, Jul 1, 2018

The shared-aperture concept and the geometric phase phenomenon were incorporated within a metasur... more The shared-aperture concept and the geometric phase phenomenon were incorporated within a metasurface to obtained photonic spin-control multifunctional devices. The shared-aperture metasurface platform opens a pathway to novel types of nanophotonic functionality.

ACS Photonics, Mar 15, 2018

Incorporation of a metasurface that involves spin-orbit interaction phenomenon into a laser cavit... more Incorporation of a metasurface that involves spin-orbit interaction phenomenon into a laser cavity provides a route to the generation of spin-controlled intracavity modes with different topologies. By utilizing the geometric phase, Pancharatnam-Berry phase, we found a spin-enabled self-consistent cavity solution of a Nd:YAG laser with a silicon-based metasurface. Using this solution we generated a laser mode possessing spin-controlled orbital-angular momentum. Moreover, an experimental demonstration of a vectorial vortex is achieved by the coherent superposition of modes with opposite spin and orbital angular momenta. We experimentally achieved a high mode purity of ∼95% due to laser mode competition and purification. The photonic spin-orbit interaction mechanism within a laser-cavity can be implemented with multifunctional sharedaperture nanoantenna arrays to achieve multiple intracavity topologies.