Detectivity enhancement in quantum well infrared photodetectors utilizing a photonic crystal slab resonator

作者：Kalchmair S^*; Gansch R; Ahn S I; Andrews A M; Detz H; Zederbauer T; Mujagic E; Reininger P; Lasser G; Schrenk W; Strasser G

来源：Optics Express, 2012, 20(5): 5622-5628.

DOI：10.1364/OE.20.005622

We characterize the performance of a quantum well infrared photodetector (QWIP), which is fabricated as a photonic crystal slab (PCS) resonator. The strongest resonance of the PCS is designed to coincide with the absorption peak frequency at 7.6 mu m of the QWIP. To accurately characterize the detector performance, it is illuminated by using single mode mid-infrared lasers. The strong resonant absorption enhancement yields a detectivity increase of up to 20 times. This enhancement is a combined effect of increased responsivity and noise current reduction. With increasing temperature, we observe a red shift of the PCS-QWIP resonance peak of -0.055 cm (1)/K. We attribute this effect to a refractive index change and present a model based on the revised plane wave method.

• 出版日期2012-2-27