Periodic nanoripples in the surface and subsurface layers in ZnO irradiated by femtosecond laser pulses

We present the formation of periodic ripples in ZnO crystal irradiated by a wavelength-tunable femtosecond laser. The results indicate that in the surface thin layer, the periods change from 0.1 lambda to lambda with laser fluences and pulse numbers, and in the subsurface layer the periods are alway...

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Bibliographic Details
Published in:Optics letters 2010-04, Vol.35 (8), p.1248-1250
Main Authors: JIA, X, JIA, T. Q, ZHANG, Y, XIONG, P. X, FENG, D. H, SUN, Z. R, QIU, J. R, XU, Z. Z
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
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Summary:We present the formation of periodic ripples in ZnO crystal irradiated by a wavelength-tunable femtosecond laser. The results indicate that in the surface thin layer, the periods change from 0.1 lambda to lambda with laser fluences and pulse numbers, and in the subsurface layer the periods are always lambda/2n, where n is the refractive index. The formation processes and mechanisms are also discussed.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.35.001248