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10 October 2020 Design and prototyping of a multi-segment grating for broadband and miniaturized spectrometer
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Compact and broadband spectrometers are used for diagnosis of cancers to distinguish healthy and tumorous tissues at point-of-care locations and remote clinical centers. In this paper, we present a design of a broadband and compact spectrometer based on a three-segment grating which is able to operate from 300 nm to 1700 nm. The spectrometer has a resolution of 6 nm in the ultraviolet-visible-near infrared (UV-VIS-NIR) spectral range and 10 nm in the short wave infrared (SWIR) range. A minimum signal-to-noise ratio (SNR) of 650 in the VIS range and 9300 in the NIR- SWIR range is achieved. Afterwards, the designed three-segment grating was fabricated in-house with ultra-precision diamond tooling followed by replication in poly-methyl-methacrylate (PMMA). The replicated three-segment grating was then experimentally characterized. The experimental results show that the three-segment grating significantly improves the acquired signal level of the spectrometer in the NIR-SWIR spectral region by at least a factor of 2 compared to a corresponding single segment Richardson grating. This result opens a new way of realizing compact and broadband spectrometers which could be integrated with portable devices.
Conference Presentation
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gebirie Yizengaw Belay, Willem Hoving, Arthur van der Put, Jürgen van Erps, Michael Vervaeke, Hugo Thienpont, and Heidi Ottevaere "Design and prototyping of a multi-segment grating for broadband and miniaturized spectrometer", Proc. SPIE 11548, Optical Design and Testing X, 115480S (10 October 2020);

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