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Theoretical analyses and simulations of terahertz generation based on difference frequency generation in nonlinear crystal ZnTe are presented in this paper. Owing to the phase mismatching and crystal absorption, the crystal length has great influence on the spectral width and determines the central frequency of the terahertz radiation. The dependence of the temporal and spectral waveforms on the pump...
Ultra-high-quality (Q>4times106) microdisk resonators are demonstrated in a Si3N4 platform at 655 nm with straight and curved in-plane coupling waveguides on a Si substrate. Selective coupling to specific radial orders and polarizations is demonstrated with phase-matching. TM modes show higher sensitivity to environmental modifications for sensing.
We have produced spectrally-bright polarization-entangled biphotons using a cavity-enhanced type-II PPKTP parametric downconverter. By detuning the cavity birefringence we have generated a novel time-bin dependent polarization-entangled biphoton state.
We have periodically poled 42/spl deg/ rotated Y-cut near-stoichiometric lithium tantalate crystals. These crystals enable QPM in surface-normal configurations for scaling to large apertures. Initial SHG results are consistent with theoretical expectations.
Summary form only given. One of the distinctive features of two-(2D) and three-dimensional (3D) photonic crystals is that the energy-wavevector dispersions of the photonic bands are anomalous, other than the existence of the band gap. In this paper, we report on a finding that the phase-matching condition in second-harmonic generation (SHG) can be readily fulfilled in a 2D photonic crystal. An experiment...
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