Efficient Terahertz Generation in Triply Resonant Nonlinear Photonic Crystal Microcavities

Details Efficient Terahertz Generation in Triply Resonant Nonlinear Photonic Crystal Microcavities Efficient Terahertz Generation in Triply Resonant Nonlinear Photonic Crystal Microcavities

2009-08-04

arxiv.org/abs/0908.0463v1

Physics

Optics

8 pages, 3 figures

Scientific paper

We propose a scheme for efficient cavity-enhanced nonlinear THz generation via difference-frequency generation (DFG) processes using a triply resonant system based on photonic crystal cavities. We show that high nonlinear overlap can be achieved by coupling a THz cavity to a doubly-resonant, dual-polarization near-infrared (e.g. telecom band) photonic-crystal nanobeam cavity, allowing the mixing of three mutually orthogonal fundamental cavity modes through a chi(2) nonlinearity. We demonstrate through coupled-mode theory that complete depletion of the pump frequency - i.e., quantum-limited conversion - is possible in an experimentally feasible geometry, with the operating output power at the point of optimal total conversion efficiency adjustable by varying the mode quality (Q) factors.

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