Investigation and modeling of UV band-passfiltering white compound materials for potting or embedding in micro-optical applications

Junfeng Zhu, Keisuke Nakakubo, Yuya Mikami, Hiroaki Yoshioka, Kinichi Morita, Yuji Oki

Research output: Contribution to journalArticle

Abstract

A novel white compound material with spectral band pass filtering was proposed and demonstrated in the UV region for wavelengths smaller than 310 nm. This compound material can be obtained by dispersing CaF 2 in polydimethylsiloxane (PDMS). Refractive index matching (RIM) of the compound material resulted in transmittance of up to 80% at RIM wavelength. In no-RIM wavelength region, refractive index difference about 0.005 could result in transmittance of down to 30% due to intense Rayleigh isotropic scattering. A good reproducibility of the transparent wavelength can be obtained with the specific CaF 2 particle and PDMS matrix in this study. Meanwhile, simple calculation based on Rayleigh- Gans-Debye approximation [J. Am. Ceram. Soc. 86(3), 480-486 (2003)] in the soft diffusion model can explain the CaF 2 : PDMS compound film transmittance spectrum in the UV region, and the bandwidth narrowing condition.

Original languageEnglish
Pages (from-to)1002-1014
Number of pages13
JournalOptical Materials Express
Volume9
Issue number3
DOIs
Publication statusPublished - Mar 1 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

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