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Second-harmonic generation of semiconductor quantum dots studied by near-field optical microscopy

✍ Scribed by G.W. Bryant; A. Liu

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
72 KB
Volume
25
Category
Article
ISSN
0749-6036

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✦ Synopsis

We present a theoretical study of optical second-harmonic generation (SHG) of symmetric semiconductor quantum dots (QDs) excited by the near field of the tip in a near-field scanning optical microscope. We show that the usual optical transition selection rules for the SH nonlinear interaction between the tip field and the QD are broken when the tip is scanned over the QD, because the tip field varies rapidly over the QD domain. It is also demonstrated that the tip-position dependence of the SH signal essentially maps the spatial distribution of the tip field.

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