期刊
OPTICS EXPRESS
卷 25, 期 8, 页码 8680-8689出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.25.008680
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资金
- National Science Foundation (NSF) [IIP-1444922]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1444922] Funding Source: National Science Foundation
We demonstrate unpolarized wideband reflectors fashioned with orthogonal serial resonant reflectors. Unpolarized incident light generates internal TM- and TE-polarized reflections that are made to cooperate to extend the bandwidth of the composite spectral reflectance. The experimental results presented show similar to 42% band extension by a two-grating module. In addition, good angular tolerance is found because the orthogonal arrangement simultaneously supports classical and fully conic mountings at oblique angles. The resulting spectra form contiguous zero-order reflectance across wide spectral/angular regions. Furthermore, using a multimodule device with serial reflectors fabricated with silicon-on-quartz wafers with different device layer thicknesses, extreme band extension is achieved providing similar to 56% fractional bandwidth with reflectance exceeding 98%. These results imply potential for developing lossless unpolarized mirrors operating in diverse spectral regions of practical interest. (C) 2017 Optical Society of America
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