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

Tawfiq Alqurashi*, Yunuen Montelongo, Pavel Penchev, Ali K. Yetisen, Stefan Dimov, Haider Butt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
418 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)13808-13819
Number of pages12
JournalNanoscale
Volume9
Issue number36
Early online date4 Sept 2017
DOIs
Publication statusPublished - 28 Sept 2017

Keywords

  • gratings
  • phase modulation
  • laser ablation
  • microphotonics
  • diffraction
  • Fresnel Zone Plate lens
  • holograms

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