Flexible Gray-Scale Surface Patterning Through Spatiotemporal-Interference-Based Femtosecond Laser Shaping

Bohong Li, Lan Jiang, Xiaowei Li, Zemeng Lin, Lingling Huang, Andong Wang, Weina Han, Zhi Wang, Yongfeng Lu

Research output: Contribution to journalArticle

Abstract

The function of a laser-shaped material depends on the geometrical morphology of its laser-induced surface structures, which is mainly determined by the spatial intensity distribution of the laser. However, conventional patterning methods based on laser shaping techniques have shortcomings in efficiency or flexibility. A novel patterning method is developed in the present study for mask-free and flexible fabrication of surface structures through a time-saving spatiotemporal-interference-based femtosecond laser shaping technique that is based on a Michelson interferometer. The phase-difference distribution is controlled by a spatial light modulator so that the interference intensity distribution can be modulated to user-designed shapes. The congruence between the interference intensity distribution and the geometries on phase holograms enables the generation of phase holograms without complicated algorithms and time-consuming calculations. This uniquely simple technique realizes flexible gray-scale patterning on bulk material surfaces with a single femtosecond laser pulse. Thus, by using the on-the-fly technique, fabrication of large-area surface structures is realized. Moreover, this technique is applied to fabricate complex structures through splicing. As an application example, three types of terahertz filters, including band-stop and band-pass filters, are fabricated successfully; their transmittance is in good agreement with the finite-difference time-domain simulation results.

Original languageEnglish (US)
Article number1801021
JournalAdvanced Optical Materials
Volume6
Issue number24
DOIs
StatePublished - Dec 17 2018

Fingerprint

gray scale
Ultrashort pulses
Surface structure
interference
Lasers
Holograms
lasers
Fabrication
Michelson interferometers
Bandpass filters
congruences
Masks
splicing
fabrication
light modulators
bandpass filters
Geometry
transmittance
flexibility
masks

Keywords

  • femtosecond laser shaping
  • patterning
  • spatiotemporal interference

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Flexible Gray-Scale Surface Patterning Through Spatiotemporal-Interference-Based Femtosecond Laser Shaping. / Li, Bohong; Jiang, Lan; Li, Xiaowei; Lin, Zemeng; Huang, Lingling; Wang, Andong; Han, Weina; Wang, Zhi; Lu, Yongfeng.

In: Advanced Optical Materials, Vol. 6, No. 24, 1801021, 17.12.2018.

Research output: Contribution to journalArticle

Li, Bohong ; Jiang, Lan ; Li, Xiaowei ; Lin, Zemeng ; Huang, Lingling ; Wang, Andong ; Han, Weina ; Wang, Zhi ; Lu, Yongfeng. / Flexible Gray-Scale Surface Patterning Through Spatiotemporal-Interference-Based Femtosecond Laser Shaping. In: Advanced Optical Materials. 2018 ; Vol. 6, No. 24.
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