Spatially and Spectrally Resolved Narrowband Optical Absorber Based on 2D Grating Nanostructures on Metallic Films
Published in Advanced Optical Materials, 2016
Abstrac: two spatially and spectrally resolved narrowband absorbers based on 2D grating nanostructures (polymethylmethacrylate (PMMA) grating and gold grating) on metallic films are designed, fabricated, and characterized. For PMMA grating on a metallic film, the measured absorption bandwidth is 12 nm with a nearly 80% absorption at normal incidence. The transverse electric (TE) localized mode shows a calculated 3.5° angular width. The transverse magnetic (TM) resonant mode supports both a localized mode and a lattice mode. The TM lattice mode shows a calculated angular width of 0.75° and exhibits a large wavelength-angle sensitivity of nearly 15 nm per degree and a large absorption-angle sensitivity of 77.5% per degree. For gold grating on a metallic film, the measured absorption bandwidth is 40 nm with a nearly 70% absorption. Such spatially and spectrally resolved 2D nanostructure arrays with large angle sensitivities have potential applications in angle measurement, thermal emitters, optical filters, and biosensors.
Recommended citation: Yurui Qu, Qiang Li, Hanmo Gong, Kaikai Du, Songang Bai, Ding Zhao, Hui Ye, Min Qiu, Advanced Optical Materials, 2016, 3(4): 480-486 https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.201500651