27 August 2010 A tunable terahertz photodetector based on electrical confinement
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The terahertz region in the electromagnetic spectrum has attracted much research interest recently, because of its potential applications in many areas, such as biological and medical imaging, free-space communications, and homeland security. Here, a tunable quantum dot photodetector for terahertz detection based on intersublevel transitions is proposed and simulated. The intersublevels are formed by a lateral electric field confinement on quantum wells. The intersublevel spacing can be tuned and in hence different wavelengths in the terahertz region can be detected. Our simulation results show a tunability of peak detection wavelength from ~3.3 to ~12 THz by only changing the electrical confinement voltages and the peak absorption coefficients of the detection are in the range of 103 cm-1. The peak calculated detectivity of the tunable photodetector is as big as 1.7x109 Jones. Compared with quantum dot terahertz photodetectors produced by self-assembled growth method, the detector presented here is easier to be tuned and the effective sizes have a much higher uniformity, because of the uniform electrical confinement.
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Wei Wu, Hooman Mohseni, "A tunable terahertz photodetector based on electrical confinement", Proc. SPIE 7763, Terahertz Emitters, Receivers, and Applications, 77630G (27 August 2010); doi: 10.1117/12.861478; https://doi.org/10.1117/12.861478


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