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We investigate the intensity and phase response of optical switches based on a photonic crystal waveguide coupled to a nanocavity. In particular, we compare the performances of switches with traditional Lorentzian transmission spectrum to switches displaying an asymmetric Fano shape, as obtained by incorporating a partially transmitting element in the waveguide. Compared to traditional Lorentzian...
We suggest and experimentally demonstrate a photonic-crystal structure with more than 30 dB difference between forward and backward transmission levels. The non-reciprocity relies on the combination of ultrafast carrier nonlinearities and spatial symmetry breaking in a Fano structure employing a single nanocavity.
We developed chalcogenide planar platform for mid-infrared applications. Careful choice of materials and control of fabrication are crucial for low-loss waveguide. The devices were demonstrated as chemical sensor and mid-infrared light source using super-continuum generation.
We have produced μ20mW of mid-infrared super continuum spanning from 1750nm to ≈8000nm spanning using a 1cm long chalcogenide waveguide pumped by a 21MHz train of 320fs pulses at 4μm.
We report the low-loss chalcogenide waveguides for bio sensing in the mid-infrared (MIR), which consisted of a Ge11. 5As24Se64.5 rib waveguide core on a magnesium fluoride crystalline substrate. The losses were < 2dB/cm from 3000-1050cm-1 (3.2 -- 9.5µm).
We have produced a stable 10mW, mid-infrared supercontinuum spanning the full functional group band from 1750nm to >7000nm spanning using a 1cm long chalcogenide waveguide pumped by a 20MHz train of 320fs pulses at 4µm.
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