Determination of the complex refractive index of individual quantum wells from distributed reflectance
Abstract
We investigate the measurement of the complex refractive index of individual quantum wells by reflectance spectroscopy. Placing the wells at half-wavelength spacing to cause resonant feedback produces an order-of-magnitude increase in measurement sensitivity over that of nonresonant structures. Quantum well dispersive and absorptive effects on reflectance can be differentiated in certain spectral regions. Experimental data confirm a theoretical model of refractive index and absorption for quantum wells of GaAs in Al0.2Ga0.8As in the region of the well band gap.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- March 1994
- DOI:
- 10.1063/1.356153
- Bibcode:
- 1994JAP....75.3056H