Feasibility Study on Ultrafast Nonlinear Optical Properties of 1.55-µm Intersubband Transition in AlGaN/GaN Quantum Wells
- 1 August 1997
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 36 (8A) , L1006
- https://doi.org/10.1143/jjap.36.l1006
Abstract
The feasibility of the intersubband transition (ISBT) in Al(Ga)N/GaN quantum wells (QWs) as a device mechanism for ultrafast optical switches is theoretically investigated. The 1.55-µ m ISBT is shown to be feasible because of its large conduction band discontinuity. The intersubband relaxation time at 1.55-µ m is estimated to be 80 fs, which is about 30 times shorter than that in InGaAs QWs. The third order nonlinear susceptibility is estimated to be 1.6×10-15 m2· V-2 for N=1×1018 cm-3. These characteristics suggest that the ISBT in nitride QWs is a promising mechanism for multi-terabit/s optical switches.Keywords
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