Fabrication and characterization of multi-scale microlens arrays with anti-reflection and diffusion properties.

Nanotechnology

Photonics and Nano-Structure Laboratory, Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan, Republic of China.

Published: May 2011

AI Article Synopsis

  • Researchers developed a method for creating artificial compound-eye structures using microlens arrays (MLAs) with advanced techniques like nanoimprint and thermo-extrusion on a polycarbonate substrate.
  • They successfully replicated these microlens arrays onto a polymethylmethacrylate surface, resulting in three-level compound-eye structures through hot-embossing.
  • The study found that these structures improved optical performance, with increased transmittance and enhanced uniformity in light distribution across the samples.

Article Abstract

In this paper, an effective method for fabricating artificial compound-eye structures is demonstrated. The fabrication of high fill factor microlens arrays (MLAs) with sub-wavelength structures (SWSs) on a polycarbonate (PC) substrate involves nanoimprint and thermo-extrusion techniques by using two different scales of nano/micromolds. In addition, the MLAs with SWSs on the PC substrate would be replicated on a polymethylmethacrylate (PMMA) millimeter concave surface by hot-embossing, forming three-level compound-eye structures. The optical properties of these samples are characterized. The transmittances of two-level PC and three-level PMMA compound structures are increased by 2.5% and 2%, and the uniformities are enhanced by 18% and 24%, respectively.

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http://dx.doi.org/10.1088/0957-4484/22/21/215303DOI Listing

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