Deep-Subwavelength 2D Periodic Surface Nanostructures on Diamond by Double-Pulse Femtosecond Laser Irradiation

Year: 2021

Authors: Mastellone M., Bellucci A., Girolami M., Serpente V., Polini R., Orlando S., Santagata A., Sani E., Hitzel F., Trucchi D.M.

Autors Affiliation: CNR, Ist Struttura Mat ISM, DiaTHEMA Lab, Sede Secondaria Montelibretti, I-00015 Rome, Italy; Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy; CNR, Ist Struttura Mat ISM, Sede Secondaria Tito Scalo, Area Ind Contrada S Loia, I-85050 Potenza, Italy; CNR, Ist Nazl Ott INO, I-50125 Florence, Italy; Semilab Germany GmbH, D-38106 Braunschweig, Germany

Abstract: Two-dimensional laser-induced periodic surface structures with a deep-subwavelength periodicity (80 nm ? ?/10) are obtained for the first time on diamond surfaces. The distinctive surface nanotexturing is achieved by employing a single step technique that relies on irradiation with two temporally delayed and cross-polarized femtosecond-laser pulses (100 fs duration, 800 nm wavelength, 1 kHz repetition rate) generated with a Michelson-like interferometer configuration, followed by chemical etching of surface debris. In this Letter, we demonstrate that, if the delay between two consecutive pulses is <=2 ps, the 2D periodicity of nanostructures can be tuned by controlling the number of pulses irradiating the surface. Under scanning mode, the method is effective in treating uniformly large areas of diamond, so to induce remarkable antireflection properties able to enhance the absorptance in the visible up to 50 times and to pave the route toward the creation of metasurfaces for future diamond-based optoelectronic devices. Journal/Review: NANO LETTERS

Volume: 21 (10)      Pages from: 4477  to: 4483

KeyWords: diamond, laser, LIPSSs, metasurface, surface texturing
DOI: 10.1021/acs.nanolett.1c01310

Citations: 48
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