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As an important transportation phenomenon, Bloch oscillations have been studied extensively in Hermitian systems. Here by exploiting the concept of parity-time symmetry, we experimentally realize for the first time Bloch oscillations in a non-Hermitian silicon photonic lattice and show that such system contains intriguing physics.
We have demonstrated a proof-of-concept for an athermal silicon slot waveguide using Ormocomp as a top cladding. Preliminarily theoretical and experimental results show that the slot waveguide geometry can completely cancel out its thermo-optical coefficient, by tailoring the optical mode overlap with silicon, silicon dioxide, and Ormocomp.
By applying chemical functionalization to a nanobeam photonic crystal cavity, an ultrasensitive gas-phase chemical sensor was demonstrated. Its nonlinear thermo-optical bi-stability is utilized to realize a novel threshold detector for cumulative chemical exposure.
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