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Structures, images, and optical performance of the thin-film wavelength selective filter. (A) Cross-sectional SEM image showing the multilayered SiO2/TiO2 stacks. (B) Photograph of a released thin-film filter on a flexible polydimethylsiloxane sheet. (C) Microscopic image of a filter (size: 150 μm × 230 μm) patterned by laser milling. (D–G) Measured and simulated transmission spectra and contour plots at varied incident angles for a filter transferred on glass.
