Femtosecond laser directed fabrication of optical diffusers

RSC Advances
Tawfiq AlqurashiHaider Butt

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.

References

Sep 27, 2006·Optics Letters·Sung-Il ChangDong Ho Shin
Feb 25, 2014·ACS Nano·Haider ButtTimothy D Wilkinson
Jan 22, 2015·Optics Express·Doo-Hee ChoJeong-Ik Lee
Aug 25, 2015·ACS Nano·Qiancheng ZhaoHaider Butt
Dec 3, 2016·Nanoscale·Rajib AhmedHaider Butt
Feb 15, 2017·Advanced Materials·Ali K YetisenSeok-Hyun Yun

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Citations

Mar 15, 2019·ACS Applied Materials & Interfaces·Tawfiq AlqurashiHaider Butt
Nov 1, 2017·ACS Applied Materials & Interfaces·Bader AlQattanHaider Butt
Apr 25, 2018·ACS Nano·Bader AlQattanHaider Butt
Jul 19, 2019·ACS Applied Materials & Interfaces·Bader AlQattanHaider Butt
Feb 11, 2020·ACS Applied Materials & Interfaces·Haodong TangHaider Butt

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Methods Mentioned

BETA
light scattering

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