Measurement of optical absorption in single quantum wells using photothermal deflection spectroscopy

Penna, A. F. S.; Shah, Jagdeep; DiGiovanni, A. E.; Cho, A. Y.; Gossard, A. C.
September 1985
Applied Physics Letters;9/15/1985, Vol. 47 Issue 6, p591
Academic Journal
We report the measurement of the optical absorption spectra of single quantum wells of GaAs (104 Ã… thick) and InGaAs (75 Ã… thick) by photothermal deflection spectroscopy. The room-temperature spectra show distinct structure due to heavy- and light-hole excitons in both GaAs and InGaAs samples. The measurements also show that absorption spectra in extremely thin (<10 Ã…) quantum wells, single heterostructures, or other microstructures with very small absorptance can be obtained by this technique.


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