Abstract

We experimentally demonstrate a photonic crystal (PC) thermal emitter that enables the electrical switching of dual emission peaks from a single light-emitting surface. The emitter consists of an n-GaAs/p-GaAs/n-GaAs stack that incorporates multiple quantum wells (MQWs) inside each pn junction. The MQWs induce narrowband thermal emission at two different wavelengths owing to the intersubband transition (ISB-T), which is enhanced by the second and third-order Γ-point resonant modes of the PC. By changing the electron density in one of the two MQWs with a reverse bias to each pn junction, we realize the separate control of the thermal emission intensity of the two peaks. Such two-wavelength switchable mid-infrared narrowband thermal emitters will benefit a number of practical applications including environmental monitoring and health diagnosis.

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