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We suggest and demonstrate experimentally a method of performing single-shot sub-wavelength resolution Coherent Diffractive Imaging (CDI), i.e. algorithmic object reconstruction from far-field intensity measurements. The method is applicable to objects that are sparse in a known basis. The prior knowledge of the object's sparsity compensates for the loss of high-spatial frequency information associated...
We show theoretically and experimentally that photonic lattices constructed from random components residing on a ring in momentum space are amorphous, yet they exhibit a bandgap, and support linear and nonlinear defect-state guidance.
We present a new approach for optimizing a 3D non-paraxial volume for multiphoton florescence microscopy. Our optimized solutions demonstrate volume reduction of up to 6.5, compared to the best current design for three-photon microscopy.
We show how to achieve negative radiation pressure in a vacuum gap inside 1D waveguides, made of ordinary dielectric birefringent layered materials. The negative radiation pressure arises from modes with opposite group and phase velocities.
We present a sparsity-based method for subwavelength coherent diffractive imaging: an algorithmic approach for reconstruction of subwavelength images from a single intensity measurement of their far-field diffraction pattern.
We find self-accelerating beams in nonlocal nonlinear media and show that their propagation dynamics is affected by boundary conditions that increase their acceleration, or cause bending in a direction opposite to the initial trajectory.
We present experimental observations of self-accelerating beams in quadratic media. Joint acceleration in the nonlinear medium, asynchronous intensity peaks of the harmonic waves and self-healing effects on the jointly-accelerating beams are shown.
We present the spatially accelerating solutions of the Maxwell equations. Such beams accelerate along a circular trajectory extending beyond the paraxial regime, thus generalizing the concept of accelerating Airy beams.
We present the observation of dispersion-free edge states in a honeycomb lattice. We show the existence of surface states on both zigzag and bearded edges, and display their dispersion-free nature by tilting the input beam
We show that a certain inhomogeneous strain induces an effective magnetic field in photonic crystals that have Dirac points. The magnetic field induces highly degenerate Landau levels and band gaps in between them.
We demonstrate theoretically and experimentally gradient-force induced, nanoparticle shockwaves forming in dense strongly scattering colloidal-suspensions. These light-induced directional ‘spear-shaped’ wavefronts allow concentrating and transporting large amounts of nanoparticles in local regions of a microfluidic channel.
We show that strain can induce large magnetic field effects in “photonic graphene” (honeycomb photonic lattices) without time-reversal symmetry-breaking. Consequently, we predict solitons bifurcating from Landau levels, and discuss how to observe them experimentally.
Honeycomb photonic lattices [1] share not only many common features with electronic grapheme (a monolayer of carbon atoms arranged in a honeycomb geometry), but can be used to explore phenomena far beyond the original electronic system. Of particular interest are complex gain/loss systems, which, under special conditions, may exhibit complex, but PT-symmetric, Hamiltonians. PT-symmetric systems are...
Wave-packets of light propagating along curved trajectories in space are rapidly gaining importance since their introduction in 2007 [1–2]. Interestingly, all such “non-diffracting self-accelerating” beams studied thus far followed a parabolic trajectory as they propagated in free space [1–5]. Here we generate continuous sets of accelerating optical beams propagating along arbitrary 1D curves in space,...
We demonstrate theoretically and experimentally non-broadening optical beams that propagate along any arbitrarily-chosen convex trajectory in space. We present a general method to construct these beams and explore their universal properties using catastrophe theory.
We present accelerating self-trapped first- and second-harmonic beams in a phased-matched quadratic process. The acceleration results from the inner structure of the beams, which exhibit unique properties such as asynchronous interference and irregular power distribution.
We demonstrate experimentally and theoretically that when a spatially-random potential exhibits fast fluctuations also in the propagation direction, transport becomes considerably faster than ballistic. This new concept has major implications on transport of quantum particles.
We show that Rabi oscillations between Bloch-modes of an waveguide array with sub-wavelength periodicity diverge, in both frequency and field amplitude, when the optical wavelength approaches a mathematical exceptional point where the Bloch-mode become self-orthogonal.
We demonstrate that optical tachyons, particles that travel faster than the speed of light, can be generated by PT-symmetry breaking in photonic graphene. We further show that the PT-symmetry can be restored via strain.
We show that strain can induce large magnetic field effects in “photonic graphene” (honeycomb photonic lattices) without time-reversal symmetry-breaking. Consequently, we predict solitons bifurcating from Landau levels, and discuss how to observe them experimentally.
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