Abstract
A highly sensitive tunable far-infrared photodetector using the 1 → 2 intersubband Stark shift in compositionally asymmetric coupled quantum cells (CACQWs) is proposed here. The operation of this device is based on the infrared absorption by electrons in the ground state transited from the ground-state subband E 1 of the CACQW to the first-excited-state subband E 2. A very large variation of eigenenergy spacing ΔE 21 ( E 2 − E 1) under an applied electric field can be achieved. Since the infrared radiation is absorbed via the intersubband resonance absorption ([ hstrok] ω = E 2 − E 1), the detected infrared wavelength can be tuned by the ΔE 21 which can be adjusted by the applied electric field. Based on theoretical calculations, a tuning range from 8 to 16 μm is predicted. This tuning capability is achieved by varying the applied electric field in the 90 to −60 kV/cm range. The absorption coefficient is evaluated by the density-of-state formalism and a very large absorption coefficient is obtained for the proposed CACQW structure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
