A High-resolution Compact Spectrometer based on a Custom-printed Varied-line-spacing Concave Blazed Grating
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AbstractWe present the modeling, design and characterization of a compact spectrometer, achieving a resolution better than 1.5 nm throughout the visible spectrum (360–825 nm). The key component in the spectrometer is a custom-printed varied-line-space (VLS) concave blazed grating, where the groove density linearly decreases from the center of the grating (530 g/mm) at a rate of 0.58 nm/mm to the edge (528 g/mm). Parametric models have been established to deterministically link the system performance with the VLS grating design parameters, e.g., groove density, line-space varying rate, and to minimize the system footprint. Simulations have been performed in ZEMAX to confirm the results, indicating a 15% enhancement in system resolution versus common constant line-space (CLS) gratings. Next, the VLS concave blazed grating is fabricated via our vacuum nanoimprinting system, where a polydimethylsiloxane (PDMS) stamp is non-uniformly expanded to form the varied-line-spacing pattern from a planar commercial grating master (600 g/mm) for precision imprinting. The concave blazed grating is measured to have an absolute diffraction efficiency of 43%, higher than typical holographic gratings (~30%) used in the commercial compact spectrometers. The completed compact spectrometer contains only one optical component, i.e., the VLS concave grating, as well as an entrance slit and linear photodetector array, achieving a footprint of 11 × 11 × 3 cm3, which makes it the most compact and resolving (1.46 nm) spectrometer of its kind.
All Author(s) ListChen Jianwei, Chen Wang, Zhang Guodong, Hui Lin, Chen Shih-Chi
Journal nameOptics Express
Volume Number25
Issue Number11
Place of PublicationUSA
Pages12446 - 12454
LanguagesEnglish-United States
Keywordsspectrometer, nanoimprinting, concave grating

Last updated on 2020-18-10 at 02:02