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Fabrication of amorphous micro-ring arrays in crystalline silicon using ultrashort laser pulses

AutorFuentes-Edfuf, Yasser ; García-Lechuga, Mario ; Puerto, D. ; Florian, Camilo ; García-Leis, Adianez ; Sánchez-Cortés, Santiago ; Solís Céspedes, Javier ; Siegel, Jan
Fecha de publicación23-may-2017
EditorAmerican Institute of Physics
CitaciónApplied Physics Letters, 110: 211602 (2017)
ResumenWe demonstrate a simple way to fabricate amorphous micro-rings in crystalline silicon using direct laser writing. This method is based on the fact that the phase of a thin surface layer can be changed into the amorphous phase by irradiation with a few ultrashort laser pulses (800 nm wavelength and 100 fs duration). Surface-depressed amorphous rings with a central crystalline disk can be fabricated without the need for beam shaping, featuring attractive optical, topographical, and electrical properties. The underlying formation mechanism and phase change pathway have been investigated by means of fs-resolved microscopy, identifying fluence-dependent melting and solidification dynamics of the material as the responsible mechanism. We demonstrate that the lateral dimensions of the rings can be scaled and that the rings can be stitched together, forming extended arrays of structures not limited to annular shapes. This technique and the resulting structures may find applications in a variety of fields such as optics, nanoelectronics, and mechatronics. Published by AIP Publishing.
Descripción5 pags., 4 figs.
Versión del editorhttp://dx.doi.org/10.1063/1.4984110
URIhttp://hdl.handle.net/10261/156483
DOI10.1063/1.4984110
ISSN0003-6951
E-ISSN1077-3118
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