Abstract
Degenerate four-wave mixing in metal colloids and photochromic glasses reveals enhancements of the conjugate signal which can be 6-8 orders of magnitude above the background value.1,2 The local field enhancement at the surface-plasmon resonance is the cause of the observed enhancement. The structure of the resonance is determined by the dielectric properties of the conducting material and the shape of the particle. Generally, the dielectric properties cannot be greatly altered by changing the temperature or the alloying; however, small deformations in the particle shape lead to a large shift of the resonance frequencies.2 When the resonance is sharp, intrinsic optical bistability can be expected and has been predicted for silver particle composites.3
© 1989 Optical Society of America
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