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Optical beams of the Bessel-type can counteract diffraction and thus maintain their profile during propagation and for this reason they have attracted considerable attention [1]. In terms of applications, Bessel beams have been studied in connection to particle manipulation, filamentation, and microscopy among others [2]. Such beams follow straight trajectories even though waves with Bessel-like profile...
We report on the first experimental investigation [1-2] of light propagation around defects in parity-time (PT) symmetric photonic lattices. An extended PT mesh lattice, as depicted in Fig. 1a, is realized using a setup consisting of two coupled fiber loops with different lengths (Fig. 1b) and time dependent modulation of net gain/loss. Time-multiplexing is applied to map a 1D grid of transverse positions...
We demonstrate stable beam self-trapping in soft-matter systems with artificial saturable self-focusing nonlinearities. Our experiments reveal optical beam interactions that can vary from attractive to repulsive as well as an energy exchange.
We report the experimental realization of a non-Hermitian optical isolator based on semiconductor nonlinear waveguide arrays. Such non-Hermitian isolators can in principle be integrated on the same semiconductor platform along with the laser source.
We theoretically and experimentally demonstrate self-accelerating Bessel-like optical beams propagating along arbitrary trajectories in free space. Such beams possess nearly symmetric nondiffracting main lobes and exhibit self-healing properties, promising for a variety of applications.
We demonstrate that supersymmetry can furnish apparently dissimilar optical structures with the same scattering and guided-wave characteristics. We explore continuous one-dimensional SUSY arrangements in order to design a new class of versatile integrated filters.
We demonstrate two conductively coupled split ring resonators that together exhibit a new resonance. The resonance quality factor is enhanced by more than one order of magnitude when compared to that of individual split rings.
We demonstrate that four-level atomic media provide a versatile platform for realizing parity-time (PT) symmetric optical potentials. The peculiar propagation dynamics emerging from such arrangements are examined both below and above the PT threshold.
We report the first experimental observation of solitons propagating in discrete steps through a temporal photonic lattice, which is implemented in a fiber-loop setup. Stable propagation over fifty coupling lengths is achieved.
We study defect and surface states in PT-symmetric optical mesh lattices. Such localized states can emerge in both the real and complex domain and can exhibit peculiar properties that are otherwise unattainable in Hermitian systems.
We investigate the acceleration dynamics of non-paraxial Bessel beams. We show that this acceleration behavior can persist even in the presence of evanescent components. Our study can be useful in plasmonic and other sub-wavelength settings.
We study propagation dynamics in a new class of optical lattices which are bi-periodic and discrete in both coordinates. These mesh structures exhibit peculiar linear and nonlinear properties which are unattainable in traditional optical lattices.
We propose a versatile platform for generating multipartite W-states in appropriately engineered on-chip photonic lattices. One and two dimensional waveguide configurations are investigated for producing W-states with predesigned probability amplitudes and relative phases.
We demonstrate that the longevity of an optical filament can be drastically increased by prudently surrounding it with a low intensity annular wavefront. Here, we systematically study the dynamics and robustness of such dressed filaments.
We demonstrate theoretically and experimentally that optical vortices can be navigated along arbitrary trajectories with a preserving donut-shaped main lobe. The possibility of using such self-accelerating vortex-Bessel-like optical beams for particle manipulation is also illustrated.
We show that supersymmetry can provide a versatile platform for a new class of optical structures. Here we introduce SUSY to two-dimensional fiber geometries that could pave the way towards integrated optical angular-momentum multiplexing schemes.
Aqueous suspensions containing pure gold nanoparticles and silica-gold core-shells are shown to exhibit different polarizibilities, thus allowing self-trapping of long needles of light. The different nonlinear mechanisms behind these processes are investigated.
We report the first observation of classical Bloch-like oscillations and revivals of light in a new class of dynamic optical systems-the so-called Glauber-Fock oscillator lattices.
We demonstrate optical trapping and rotation of microparticles and bacteria with propelling beams. The rotation is achieved in a tweezers-like setting and fully controlled by SLM without the need of mechanical movement or phase-sensitive interference.
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