Far infrared and terahertz quantum well intra-subband photodetector (QWISP)

David Z.-Y. Ting; Yia-Chung Chang; Sumith V. Bandara; Sarath D. Gunapala

doi:10.1117/12.735138

26 September 2007 Far infrared and terahertz quantum well intra-subband photodetector (QWISP)

David Z.-Y. Ting, Yia-Chung Chang, Sumith V. Bandara, Sarath D. Gunapala

Proceedings Volume 6660, Infrared Systems and Photoelectronic Technology II; 66600F (2007) https://doi.org/10.1117/12.735138
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

We describe a new device concept for far infrared (FIR) / terahertz (THz) radiation detection based on the use of dopant-assisted intra-subband absorption mechanism in quantum wells. We compare the Quantum Well Intra-Subband Photodetector (QWISP) to the FIR/THz quantum-well infrared photodetector (QWIP) and heterojunction internal photoemission (HIP) devices to clarify the device concept. We demonstrate QWISP's effectiveness through theoretical simulations by comparing it with the FIR/THz QWIP with comparable dark current levels and peak spectral positions. In particular, our modeling results show that in a device designed for ~110 μm peak response, the QWISP peak absorption coefficient and responsivity, respectively, are approximately 100 and 10 times strong than those for the FIR/THz QWIP. The QWISP is a compact device with normal incidence response, does not require very low barriers, and is compatible with existing GaAs focal-plane array technology.

Citation Download Citation

David Z.-Y. Ting, Yia-Chung Chang, Sumith V. Bandara, and Sarath D. Gunapala "Far infrared and terahertz quantum well intra-subband photodetector (QWISP)", Proc. SPIE 6660, Infrared Systems and Photoelectronic Technology II, 66600F (26 September 2007); https://doi.org/10.1117/12.735138

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