1 August 1990 Compositionally asymmetrical multiquantum wells: quasi-molecules for giant optical nonlinearities in the infrared (9-11 um)
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Proceedings Volume 1273, Nonlinear Optical Materials III; (1990) https://doi.org/10.1117/12.20472
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands
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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emmanuel Rosencher, Emmanuel Rosencher, Philippe Francis Bois, Philippe Francis Bois, Julien Nagle, Julien Nagle, } "Compositionally asymmetrical multiquantum wells: quasi-molecules for giant optical nonlinearities in the infrared (9-11 um)", Proc. SPIE 1273, Nonlinear Optical Materials III, (1 August 1990); doi: 10.1117/12.20472; https://doi.org/10.1117/12.20472
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