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We present a new tuning scheme for THz quantum-cascade lasers based on active photonic crystal (PhC) resonators. An injected gas changes the resonance condition of the PhC and thereby the emission frequency of the device.
The integration of photonic crystal (PC) resonators into the active region of terahertz quantum cascade lasers emitting around 2.7 THz is presented. The PC acts as frequency selective mirror and allows the tuning of the emission frequency throughout the entire gain region of the active zone. The PC and the gain region are embedded in a double-metal wave guide.
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