Self-assembled periodic sub-wavelength structures by femtosecond laser direct writing

Yang, Weijia, Bricchi, Erica, Kazansky, Peter G., Bovatsek, James and Arai, Alan Y. (2006) Self-assembled periodic sub-wavelength structures by femtosecond laser direct writing. Optics Express, 14 (21), 10117-10124. (doi:10.1364/OE.14.010117).

Abstract

Self-assembled, sub-wavelength periodic structures are induced in fused silica by a tightly focused, linearly polarized, femtosecond laser beam. Two different types of periodic structures, the main one with period (λ_E) in the direction of the laser beam polarization and the second with period (λ_k) in the direction of the light propagation, are identified from the cross-sectional images of the modified regions using scanning electron microscopy. We demonstrate the spatial coherence of these nanogratings in the plane perpendicular to the beam propagation direction. The range of effective pulse energy which could produce nanogratings narrows when the pulse repetition rate of writing laser increases. The period λ_E is proportional to the wavelength of the writing laser and period λ_k in the head of the modified region remains approximately the wavelength of light in fused silica.

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