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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 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.
Second Harmonic Generation, due to its surface selectivity, is a well suited tool to study the surface of nanoparticles. In this contribution we analyse and model experiments on SHG at dielectric, metallic and core-shell particles.
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