Second-harmonic generation investigations of asymmetric coupled quantum wells
- 7 March 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 63 (12), 125308
- https://doi.org/10.1103/physrevb.63.125308
Abstract
Second-order nonlinear optical properties of strained asymmetric coupled quantum wells (ACQW’s) have been investigated by using the reflective second-harmonic generation (SHG) technique. Compared with the SHG intensities in ZnSe bulk material, a significant enhancement of the signals was observed in ACQW’s due to the centrosymmetry-breaking effect resulting from the strong-coupling interaction between adjacent quantum wells. The second-harmonic intensity was also found to increase with decreasing cadmium concentration x because of the second-harmonic off-resonance effect. Moreover, the SHG intensity versus the sample azimuthal angle shows an obvious in-plane anisotropy with a period of 180°, and our numerical calculations of the SHG dependence on azimuthal or polarization angle agreed well with experimental results.
Keywords
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