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

Citation
Gw. Bryant et As. Liu, Second-harmonic generation of semiconductor quantum dots studied by near-field optical microscopy, SUPERLATT M, 25(1-2), 1999, pp. 361-365
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SUPERLATTICES AND MICROSTRUCTURES
ISSN journal
0749-6036 → ACNP
Volume
25
Issue
1-2
Year of publication
1999
Pages
361 - 365
Database
ISI
SICI code
0749-6036(199901/02)25:1-2<361:SGOSQD>2.0.ZU;2-9
Abstract
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 betwee n the tip field and the QD are broken when the tip is scanned ever the QD, because the tip field varies rapidly over the QD domain. It is also demonst rated that the tip-position dependence of the SH signal essentially maps th e spatial distribution of the tip field. (C) 1999 Academic Press.