Subpicosecond photocarrier lifetimes in GaSb/ErSb nanoparticle superlattices at 1.55 μm

Hanson, M. P.; Driscoll, D. C.; Zimmerman, J. D.; Gossard, A. C.; Brown, E. R.
October 2004
Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3110
Academic Journal
We demonstrate subpicosecond photocarrier lifetimes at 1.55 μm in GaSb/ErSb nanoparticle superlattices grown by molecular beam epitaxy. Pump–probe measurements were made with a 1.55 μm mode-locked laser in transmission geometry to determine the photocarrier lifetime. The lifetime is found to be dependent on the size of the ErSb particles, amount of ErSb, and the distance between layers of particles. Through manipulation of these three parameters the photocarrier lifetime can be tuned down to less than 300 fs, the temporal limit of our experiment.


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