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Optical absorption cross section of quantum dots

Osborne, Simon W., Blood, Peter, Smowton, Peter Michael ORCID:, Xin, Y. C., Stintz, A., Huffaker, D. and Lester, L. F. 2004. Optical absorption cross section of quantum dots. Journal of Physics: Condensed Matter 16 (35) , S3749. 10.1088/0953-8984/16/35/016

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We have measured the modal optical absorption spectrum of a three-layer system of InAs quantum dots in a slab waveguide geometry, observing distinct absorption peaks for the ground and excited states. The spectrally integrated absorption cross section for the ground and first excited states are determined to be σ0 = (0.43 ± 0.1) × 10−15 and (0.92 ± 0.2) × 10−15 cm2 eV, respectively. Assuming that the spectral shapes are determined primarily by the inhomogeneous size distribution of dots the Gaussian linewidths are 16 and 19 meV for the ground and first excited state transitions, respectively. The peak ground state absorption cross section is 1.1 × 10−14 cm2. The ground state spectrally integrated cross section estimated by a theory with the envelope function overlap integral taken to be unity is 0.40 × 10−15 cm2 eV, in agreement with the measured value. We conclude that on the basis of the spectrally integrated cross section there is no evidence for a substantial reduction in the strength of the fundamental light–matter interaction in dots compared with systems of higher dimensionality.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: IOP Publishing
ISSN: 0953-8984
Last Modified: 25 Oct 2022 09:39

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