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Opt Express. 2008 Apr 14;16(8):5206-17.

Terahertz quantum cascade lasers based on two-dimensional photonic crystal resonators.

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  • 1Institute of Physics, University of Neuchâtel, CH-2000 Neuchâtel, Switzerland.


We demonstrate high spectral control from surface emitting THz Quantum Cascade Lasers based on a two-dimensional photonic crystal cavity. The perforated top metallic contact acts as an in plane resonator in a tight double-metal plasmonic waveguide providing a strong optical feedback without needing three-dimensional cavity features. The optical far-field patterns do not exhibit the expected symmetry and the shape of the cavity mode. The difference is attributed to a metal surface plasmon mediated light outcoupling mechanism also responsible for the relatively low extraction efficiency.

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