Direct measurement of local field factors for second-harmonic generation from quantum dot Langmuir monolayers compressed through the metal-insulator transition

C. P. Collie Department of Chemistry and Biochemistry, 405 Hilgard Avenue, University of California, Los Angeles, California, 90095-1569, USA

S. Henrich Department of Chemistry and Biochemistry, 405 Hilgard Avenue, University of California, Los Angeles, California, 90095-1569, USA

name J. R. Heath Department of Chemistry and Biochemistry, 405 Hilgard Avenue, University of California, Los Angeles, California, 90095-1569, USA; Phone: Telephonet (310) 825-2836 Fax: Telephonet (310) 825-2836 E-mail: [email protected].

Abstract

The frequency-dependent complex optical dielectric function ε was determined in situ in order to calculate local electric field factors responsible for large (500-fold) enhancements in second-harmonic generation (SHG) observed from two-dimensional superlattices of silver quantum dots compressed through a reversible metal-insulator transition. For all films studied, the local field contribution amounted to, at most, a few per cent of the total SHG enhancement observed. This indicates that the enhancement is dominated by changes in the intrinsic optical nonlinearity X(2) of the system and not by linear optical effects.

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Direct measurement of local field factors for second-harmonic generation from quantum dot Langmuir monolayers compressed through the metal-insulator transition

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Direct measurement of local field factors for second-harmonic generation from quantum dot Langmuir monolayers compressed through the metal-insulator transition

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