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.
| Original language | English |
|---|---|
| Pages (from-to) | 1299-1305 |
| Number of pages | 7 |
| Journal | Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties |
| Volume | 79 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 1999 |
| Externally published | Yes |
Funding
ACKNOWLEDGEMENTS We acknowledge support from the National Science Foundation Grants for the Organization of an Academic Liaison with Industry, from the Alfred P. Sloan Foundation and from the Packard Foundation. We acknowledge many helpful discussions with Professor Y. R. Shen, Professor R. J. Saykally, Professor R. D. Levine and Professor F. Remacle.