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We analyze self-collimation in two-dimensional periodic complex lattices. We consider P-symmetric and PT-symmetric complex lattices with different geometries, where the periodic modulations of both refractive index and gain-loss are either in-phase, or dephased a quarter of wavelength of the modulation. The non-diffractive propagation of light beams is analytically predicted using coupled mode approach...
We investigate spatial propagation effect behind the Photonic Crystal under particular dispersion conditions, which lead to a near field focusing. We analyze and experimentally demonstrate full two-dimensional near field focusing of light beams at visible frequencies behind the flat three-dimensional woodpile photonic crystal. Experimental results correspond well with numerical FDTD calculations as...
Photonic crystals (PhCs) are materials with spatially modulated refraction index on a wavelength scale. They are well-known due to their temporal dispersion and photonic band-gaps, but also for the spatial dispersion properties, allowing the management of spatial propagation properties of light. For particular geometries PhCs may provide non-diffractive propagation of light or even negative spatial...
We study parametric frequency conversion in quadratic nonlinear media with disordered ferroelectric domains. We demonstrate that disorder allows realizing broadband second- and third-harmonic generation via cascading of two second-order quasi-phase matched nonlinear processes. Application to short-pulse measurements is demonstrated.
This article proposes an alternative method for spatial filtering based on the propagation of the beam through a thin slice of photonic crystal. With this method, undesired spatial spectra components are strongly deflected, whereas the "clean" part of the beam propagates through the crystal without any deflection and losses.
We report the results of an experimental study on broadband second-harmonic (SH) parametric scattering in an un-poled strontium barium niobate (SBN) crystal with random-size ferroelectric domains. We consider different geometries of the interacting waves. The observed spatial distribution of the SHG is due to the larger facility to achieve phase matching conditions in the presence of disorder, and...
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