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Type: Artigo de periódico
Title: Optical diffraction gratings produced by laser interference structuring of amorphous germanium-nitrogen alloys
Author: Mulato, M
Zanatta, AR
Toet, D
Chambouleyron, IE
Abstract: We use the interference of two pulsed laser beams (wavelength=355 nm) to produce an optical diffraction grating in amorphous germanium-nitrogen alloy (a-GeN). At the constructive maxima of the interference pattern, the absorption of light leads to crystallization. The crystallized region results of pure microcrystalline germanium (muc-Ge). An indication that Ge-N bonds have broken and nitrogen outdiffused of the film is obtained from infrared spectroscopy and confirmed by Raman spectra. A pattern of alternating a-GeN and muc-Ge lines with a period of about 4 mum acts as an optical diffraction grating due to the difference in optical properties between the two materials, and the three dimensional surface profile, caused by N-2 effusion, that is formed on the sample. (C) 2002 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Applied Physics Letters. Amer Inst Physics, v. 81, n. 15, n. 2731, n. 2733, 2002.
Rights: aberto
Identifier DOI: 10.1063/1.1512307
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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