Ultrafast intersubband relaxation and nonlinear susceptibility at 1.55 μm in GaN/AlN multiple-quantum wells

Hamazaki, J.; Matsui, S.; Kunugita, H.; Ema, K.; Kanazawa, H.; Tachibana, T.; Kikuchi, A.; Kishino, K.
February 2004
Applied Physics Letters;2/16/2004, Vol. 84 Issue 7, p1102
Academic Journal
Using a degenerate pump–probe technique on the Brewster configuration at room temperature, we investigate the dynamics of the intersubband transition in GaN/AlN multiple-quantum wells. The relaxation dynamics is found to consist of ultrafast (∼140 fs) and slower (∼1.3 ps) components. We estimate the third-order susceptibility for the Brewster configuration to be ∼5.5×10[sup -18] m[sup 2]/V[sup 2], which indicates that its value becomes ∼2.2×10[sup -16] m[sup 2]/V[sup 2] when a light beam is parallel to the well. © 2004 American Institute of Physics.


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