Design and prototyping of a multi-segment grating for broadband and miniaturized spectrometer

Gebirie Yizengaw Belay; Willem Hoving; Arthur van der Put; Jürgen van Erps; Michael Vervaeke; Hugo Thienpont; Heidi Ottevaere

doi:10.1117/12.2575166

10 October 2020 Design and prototyping of a multi-segment grating for broadband and miniaturized spectrometer

Gebirie Yizengaw Belay, Willem Hoving, Arthur van der Put, Jürgen van Erps, Michael Vervaeke, Hugo Thienpont, Heidi Ottevaere

Author Affiliations +

Proceedings Volume 11548, Optical Design and Testing X; 115480S (2020) https://doi.org/10.1117/12.2575166
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

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.

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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); https://doi.org/10.1117/12.2575166

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