Share Email Print

Proceedings Paper

Compositionally asymmetrical multiquantum wells: quasi-molecules for giant optical nonlinearities in the infrared (9-11 um)
Author(s): Emmanuel Rosencher; Philippe Francis Bois; Julien Nagle
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

Transitions between the subbands of quantum wells have extremely large oscillator strengths. Since second-order nonlinear optical coefficients are proportional to the square of oscillator strength, strong nonlinear effects are expected in such systems, provided inversion symmetry is broken. This paper reviews the main results (optical rectification, second harmonic generation) obtained in structures in which the symmetry breaking has been realized by growing AlGaAs multiquantum wells with asymmetrical Al gradients. We show that, in these structures, the dipole matrix elements have magnitudes comparable to the well thicknesses, i.e. in the few nanometers range instead of the few picometers usually found in molecules. These Compositionally Asymmetrical multiquantum wells may thus be viewed as giant "quasi-molecules" optimized for optical nonlinearities in the mid infared.

Paper Details

Date Published: 1 August 1990
PDF: 12 pages
Proc. SPIE 1273, Nonlinear Optical Materials III, (1 August 1990); doi: 10.1117/12.20472
Show Author Affiliations
Emmanuel Rosencher, Thomson-CSF (France)
Philippe Francis Bois, Thomson-CSF (France)
Julien Nagle, Thomson-CSF (France)

Published in SPIE Proceedings Vol. 1273:
Nonlinear Optical Materials III
Peter Guenter, Editor(s)

© SPIE. Terms of Use
Back to Top