Abstract
We demonstrate spectrally single-mode, low-divergence surface-emission from photonic-crystal quantum cascade lasers operating in the mid-infrared spectral range (λ~7.2μm). The photonic-crystal resonator is defined by the sole top metallization. No semiconductor etch is employed. The effective index contrast is induced by the different profiles of surface plasmon and air-confined modes. Numerical electromagnetic simulations show that the resonator Q-factor depends strongly on the r/a ratio. The devices – which operate up to 220 K - exhibit single mode emission with a side mode suppression ratio ≥20/25dB. The far-field emission pattern is doughnut-shaped, with a full divergence angle of ~12 degrees.
© 2009 Optical Society of America
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