Formation Mechanisms of Sub-Wavelength Ripples During Femtosecond Laser Pulse Train Processing of Dielectrics

Abstract

A new model is proposed to investigate femtosecond laser pulse train processing of dielectrics by including the laser wave properties in the photon particle properties based plasma model. In the case studies, the pulse duration is 50fs and the pulse delays are 0, 25, 50 and 75fs. Both the laser waveparticle duality and transient localized changes of material properties are considered in the proposed model, and the formation mechanism of sub-wavelength ripples is revealed. This study shows that the interference between surface plasmons and laser field plays a key role in the formation of sub-wavelength ripples for which the excitation of surface plasmons is necessary. The predicted period of sub-wavelength ripples is in agreement with the experiments. © 2012 IOP Publishing Ltd.

Department(s)

Mechanical and Aerospace Engineering

Second Department

Electrical and Computer Engineering

International Standard Serial Number (ISSN)

0022-3727

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 Institute of Physics - IOP Publishing, All rights reserved.

Publication Date

01 Jan 2012

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