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A multistep thermochemical etching procedure was applied to very large Nd3+:YAG rods to increase their fracture strength. The strengthening procedure combined selection of high-quality material, fine centerless grinding, thermochemical etching, and (after completion of the lapping, polishing and AR coating) an additional hot thermochemical etching, with rod ends protected with poly-tetra-fluoro-ethylene...
We have been investigating light-matter interaction in extreme-parameter structures. We have found that metastructures with unconventional material parameters provide us with unique platforms exhibiting unprecedented classical and quantum metaphotonic features with various potential applications.
We show that introducing asymmetric coupling can force all the modes of a waveguide lattice to localize, except for one topologically protected “edge-state” which becomes extended. This mode has real eigenvalues and retains topological properties.
We study the interface between two artificial gauge fields in a 2D photonic lattice, and find the analogues of Snell's law and Fresnel coefficients of such interfaces.
We present a quantum circuit model for the description of charges and fields around a nanosphere in the context of optical metatronics. We calculate quantum charge fluctuations and note an excellent agreement with full-wave model.
We show how to modify the effective Hamiltonian of a dynamic system in an almost arbitrary fashion, using periodic gauge and driving. As an example, we generalize dynamic localization and counteract disorder effects in waveguide lattices.
We propose a new class of photonic topological insulators, for which we use synthetic dimensions to induce topologically-protected photonic propagation in the bulk of the lattice instead of around the edge.
We experimentally demonstrate localization of visible light in deep subwavelength disordered multilayers with ∼15 nm layer thicknesses, making it possible to sense 2 nm thickness variations in individual layers, and we demonstrate localization enhanced transmission.
We present the first study on the interplay between lattice wave dynamics and curved space. We demonstrate Bloch oscillations and dynamic localization induced by space curvature, for configurations which in flat-space show only discrete diffraction.
We experimentally demonstrate, for the first time, waveguiding using artificial gauge fields. We use a system of waveguide arrays where the gauge field, arising by tilting the waveguides, affects transversal dynamics and generates guided modes.
We present the first topological laser: topologically-protected lasing in photonic honeycomb lattices. We show that the lasing modes are unidirectional and robust to defects.
We propose that waveguide array-based photonic topological insulators can be used to protect the entanglement of quantum states in photonic quantum walks. The promise of the field of ‘topological photonics’ lines in the use of the physics of the quantum Hall effect and topological insulators, usually associated with electrons passing through solid-state materials, to provide robustness to complex...
We show that entangled photons propagating along the edge of a photonic topological insulator preserve their entanglement despite edge defects of any kind. This represents a novel methodology for the transport of quantum information.
We demonstrate theoretically and experimentally topological interface states in a passive effective PT-symmetric dimerized waveguide array. The PT-symmetric system has unbroken PT symmetry: all eigenvalues in the spectrum are real, despite the system's non-Hermiticity.
We present the first PT-symmetric topological insulator system: topologically-protected transport of edge states in PT-symmetric photonic honeycomb lattices.
We present photonic topological modes without a topological edge: topologically protected states which reside at a non-topological interface in the bulk of a photonic topological insulator (a honeycomb lattice of helical waveguides).
We present self-imaging of optical waves along curved trajectories, theoretically and experimentally. Unlike the Talbot effect, the field wave need not be periodic. Paraxially, self-imaging persists indefinitely, while non-paraxially is limited by overall bending angle.
We introduce loss-proof shape-invariant nonparaxial accelerating beams that overcome both diffraction and absorption, and demonstrate their use in acceleration of microparticles inside liquids along curved trajectories that are significantly steeper than ever achieved.
Topological insulators have been recently extended to photonics; however, the measurement of their topological invariant has been limited to probing edge states, an indirect measure. Here we optically measure a topological invariant using only bulk information.
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