Femtosecond laser directed fabrication of optical diffusers

Research output: Contribution to journalArticle

External organisations

  • Nanotechnology Laboratory
  • Department of Mechanical Engineering
  • Shaqra University

Abstract

Optical diffusers are widely used in filament lamps, imaging systems, display technologies, lasers, and Light Emitting Diodes (LEDs). Here, a method for the fabrication of optical diffusers through femtosecond laser machining is demonstrated. Float glass surfaces were ablated with femtosecond laser light to form nanoscale ripples with dimensions comparable to the wavelength of visible light. These structures produce highly efficient and wide field of view diffusers. The machined patterns altered the average surface roughness, with the majority of particles in the range of a few hundred nanometers. The optical diffusion characteristic and a maximum diffusion angle of near 172° was achieved with optimum machining parameters. The transmission performance of the diffusers was measured to be ∼30% across the visible spectrum. The demonstrated technique has potential for producing low-cost large area optical devices. The process benefits from the flexibility of the laser writing method and enables the production of custom optical diffusers.

Details

Original languageEnglish
Pages (from-to)18019-18023
Number of pages5
JournalRSC Advances
Volume7
Issue number29
Early online date24 Mar 2017
Publication statusPublished - 2017