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Nonlinear absorption of intense short pulse laser over a metal surface embedded with nanoparticles

Published online by Cambridge University Press:  11 July 2011

Ashok Kumar*
Affiliation:
Department of Physics, Amity Institute of Applied Sciences, ASET, Amity University, Noida, India
A. L. Verma
Affiliation:
Department of Physics, Amity Institute of Applied Sciences, ASET, Amity University, Noida, India
*
Address correspondence and reprint requests to: Ashok Kumar, Department of Physics, Amity Institute of Applied Sciences, ASET, Amity University, Noida, U.P., 201303, India. E-mail: ashokkumarthakur@yahoo.com

Abstract

The anomalous absorption of laser, incident at an arbitrary angle of incidence on a metal surface embedded with nanoparticles, is studied. The electrons inside a nanoparticle resonantly absorb laser energy when the laser frequency equals the frequency of surface charge oscillations of the nanoparticle. A monolayer of nanoparticles of radius rnp0 ≈ 50 A with inter-particle separation d ~ 10rnp0 can cause up to 40% reduction of the reflection of p-polarized laser light. The absorption coefficient increases with the angle of incidence and has a sharp peak at a resonant frequency width of about 1%. At high laser power, even if the nanoparticles are initially off resonant with the laser, the particle heating and subsequent expansion reduces the resonance frequency, and the resonance absorption is realized after a time delay. The delay is found to be directly proportional to the cluster size and inversely proportional to the laser intensities.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2011

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