Share Email Print
cover

Proceedings Paper

Strong intersubband absorption by photogenerated carriers in quantum wells
Author(s): Elliott R. Brown; K. Alexander McIntosh; Kirby B. Nichols
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Intersubband absorption spectra in the 10-micrometers region are measured between 4.2 and 290 K in four n-type GaAs/Al0.28Ga0.72As multiple-quantum-well samples. The carriers responsible for the absorption are generated by a cross-gap pump laser operating at 0.75 micrometers . The absorption strength per unit pump power is found to depend strongly on the background electron sheet density (sigma) B, and is greatest by far in a sample having (sigma) B approximately equals 4 X 1010 cm-2. By measuring the speed of response, the cause of the strong photoabsorption is found to be a long photoelectron lifetime. The sample with the strongest photoabsorption is used to make an efficient CO2-laser modulator.

Paper Details

Date Published: 3 September 1992
PDF: 11 pages
Proc. SPIE 1675, Quantum Well and Superlattice Physics IV, (3 September 1992); doi: 10.1117/12.137616
Show Author Affiliations
Elliott R. Brown, Lincoln Lab./MIT (United States)
K. Alexander McIntosh, Lincoln Lab./MIT (United States)
Kirby B. Nichols, Lincoln Lab./MIT (United States)


Published in SPIE Proceedings Vol. 1675:
Quantum Well and Superlattice Physics IV

© SPIE. Terms of Use
Back to Top