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Fabrication of optical diffusers with randomized periodic units using ultraprecision machining
Author(s): Toru Inomata; Daisuke Seki; Masato Okano; Kazuya Yamamoto; Yukinobu Nishio; Yuya Nakamura; Atsuhiko Nishihara; Seiichiro Kitagawa
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Paper Abstract

We fabricated transmissive optical diffusers with a randomized concavo-convex surface that was designed to control the irradiation distribution and can be fabricated easily. The diffusers were molded from acrylic using the mold cores machined by ultraprecision cutting or milling. Less stray light was observed from the diffuser molded with the cutting core compared with the milling core. As the Fourier optics simulation was consistent with the measured distribution, it was beneficial for the design evaluation of diffusers. Furthermore, we molded a Penrose-tiling micro-lens-array to generate uniform light distribution without random displacement of each lens. The measurement results showed the feasibility of the Penrosetiling micro-lens-array as a diffuser.

Paper Details

Date Published: 22 February 2018
PDF: 9 pages
Proc. SPIE 10544, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XI, 105440O (22 February 2018); doi: 10.1117/12.2289344
Show Author Affiliations
Toru Inomata, Nalux Co., Ltd. (Japan)
Daisuke Seki, Nalux Co., Ltd. (Japan)
Masato Okano, Nalux Co., Ltd. (Japan)
Kazuya Yamamoto, Nalux Co., Ltd. (Japan)
Yukinobu Nishio, Nalux Co., Ltd. (Japan)
Yuya Nakamura, Nalux Co., Ltd. (Japan)
Atsuhiko Nishihara, Nalux Co., Ltd. (Japan)
Seiichiro Kitagawa, Nalux Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 10544:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XI
Georg von Freymann; Winston V. Schoenfeld; Raymond C. Rumpf, Editor(s)

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