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Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

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Abstract

Femtosecond laser ablation allows direct patterning of engineering materials in industrial settings without requiring multistage processes such as photolithography or electron beam lithography. However, femtosecond lasers have not been widely used to construct volumetric microphotonic devices and holograms with high reliability and cost efficiency. Here, a direct femtosecond laser writing process is developed to rapidly produce transmission 1D/2D gratings, Fresnel Zone Plate lenses, and computer-generated holograms. The optical properties including light transmission, angle-dependent resolution, and light polarization effects for the microphotonic devices have been characterized. Varying the depth of the microgratings from 400 nm to 1.5 μm allowed the control over their transmission intensity profile. The optical properties of the 1D/2D gratings were validated through a geometrical theory of diffraction model involving 2D phase modulation. The produced Fresnel lenses had transmission efficiency of ∼60% at normal incidence and they preserved the polarization of incident light. The computer-generated holograms had an average transmission efficiency of 35% over the visible spectrum. These microphotonic devices had wettability resistance of contact angle ranging from 44° to 125°. These devices can be used in a variety of applications including wavelength-selective filters, dynamic displays, fiber optics, and biomedical devices.

Graphical abstract: Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

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Publication details

The article was received on 18 Jun 2017, accepted on 02 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR04377E
Citation: Nanoscale, 2017, Advance Article
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    Femtosecond laser ablation of transparent microphotonic devices and computer-generated holograms

    T. Alqurashi, Y. Montelongo, P. Penchev, A. K. Yetisen, S. Dimov and H. Butt, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR04377E

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