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12 July 2019 Binary blazed reflection grating for UV/VIS/NIR/SWIR spectral range
Frank Burmeister, Thomas Flügel-Paul, Uwe D. Zeitner, Mane-Si-Laure Lee Bouhours, Gaëlle Lehoucq, Julie Cholet, Brigitte Loiseaux, Nicolas Tetaz, Roman Windpassinger, Matteo Taccola
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Proceedings Volume 11180, International Conference on Space Optics — ICSO 2018; 111801J (2019) https://doi.org/10.1117/12.2535974
Event: International Conference on Space Optics - ICSO 2018, 2018, Chania, Greece
Abstract
We report on the design and fabrication of a reflection grating for hyperspectral applications operating in the range from 340 nm to 1040 nm wavelength. The blazed grating is based on an effective medium approach, where the desired functionality is realized using a binary surface relief structure. For each period, a gradient in size of the local grating features mimics an interface which adds a linear phase profile to the illuminating beam – thus introducing diffraction. The surface relief structure is composed of 2D structures - pillars with diameters from 200 nm to 350 nm to voids with diameters from 300nm to 120 nm. Overall, an entire number of ~50 such features are arranged to establish an overall unit cell of the grating over a length of 30 μm. By purposeful design of size, shape and arrangement of the sub-wavelength features such gratings offer novel opportunities in tailoring the spectral response, i.e. particular broadband efficiency or the enhancement of the efficiency in specific sub-domains of the spectrum. We will present measured performance results of a grating covering a circular area of 80mm in diameter manufactured on a 4inch-wafer. Finally, we will give an outlook on how such structures can be applied to curved surfaces and even ultra-broadband operation.
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Frank Burmeister, Thomas Flügel-Paul, Uwe D. Zeitner, Mane-Si-Laure Lee Bouhours, Gaëlle Lehoucq, Julie Cholet, Brigitte Loiseaux, Nicolas Tetaz, Roman Windpassinger, and Matteo Taccola "Binary blazed reflection grating for UV/VIS/NIR/SWIR spectral range", Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111801J (12 July 2019); https://doi.org/10.1117/12.2535974
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KEYWORDS
Diffraction gratings
Diffraction
Binary data
Optical design
Manufacturing
Nanoimprint lithography
Prototyping
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