THz Wave Generation by Difference Frequency Mixing in Photonic Crystal Cavity
KANSAI ADVANCED RESEARCH CENTER KOBE (JAPAN)
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It is known that a defect mode within a photonic band gap is localized in the photonic crystal. This suggests that a high-Q and loss-less cavity for an electromagnetic wave can be realized, and that it is possible to make an efficient and compact oscillator using such a photonic crystal cavity. In this paper we report observation of defect modes in a pseudo-simple-cubic lattice dO.4 mm generated by excitation of a nonlinear crystal defect layer embedded in the photonic crystal with femtosecond pulses. The observed defect modes show different magnitudes and frequencies for defect layers with different thickness, suggesting a layer-thickness dependence of the defect modes. For the purpose of an efficient generation of narrow band THz radiation by difference frequency mixing DFM in the photonic crystal cavity, an experimental scheme using a chirped pulse beating is proposed.