NIR, MWIR and LWIR quantum well infrared photodetector using interband and intersubband transitions
Alves, Fabio Durante P.
MetadataShow full item record
This paper presents the design, fabrication and characterization of a QWIP photodetector capable of detecting simultaneously infrared radiation within near infrared (NIR), mid wavelength infrared (MWIR) and long wavelength infrared (LWIR). The NIR detection was achieved using interband transition while MWIR and LWIR were based on intersubband transition in the conduction band. The quantum well structure was designed using a computational tool developed to solve self-consistently the Schro¨dinger–Poisson equation with the help of the shooting method. Intersubband absorption in the sample was measured for the MWIR and LWIR using Fourier transform spectroscopy (FTIR) and the measured peak positions were found at 5.3 lm and 8.7 lm which agree well with the theoretical values obtained 5.0 lm and 9.0 lm for the two infrared bands which indicates the accuracy of the self-consistent model. The photodetectors were fabricated using a standard photolithography process with exposed middle contacts to allow separate bias and readout of signals from the three wavelength bands. The measured photoresponse gave three peaks at 0.84 lm, 5.0 lm and 8.5 lm wavelengths with approximately 0.5 A/W, 0.03 A/W and 0.13 A/W peak responsivities for NIR, MWIR and LWIR bands, respectively. This work demonstrates the possibility of detection of widely separated wavelength bands using interband and intersubband transitions in quantum wells.
The article of record as published may be located at http://dx.doi.org/10.1016/j.infrared.2006.10.021
Showing items related by title, author, creator and subject.
Yeo, Hwee Tiong (Monterey, California. Naval Postgraduate School, 2004-12);In this thesis, the performance of a step quantum well infrared photodetector (QWIP), which was designed to detect a laser spot at 1.05 m Ã¦ and IR radiation between 9.5 m Ã¦ to 10.5 m Ã¦, was evaluated. In the far infrared ...
Alves, Fabio Durante Pereira (Monterey, California. Naval Postgraduate School, 2005-09);Recent military applications have demanded photodetectors with high sensitivity, high selectivity and multispectral capability for detection and identification of the target. These characteristics have been found in quantum ...
Tan, Chee Yong (Monterey, California ; Naval Postgraduate School, 1999-03);Infrared polarization techniques to improve the target-background contrast are the subject of much study lately. Polarized infrared images of the research vessel, R/V POINT SUR were taken extensively during the Electro-Optical ...