14 May 2008 IC-compatible microspectrometer using a planar imaging diffraction grating
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Proceedings Volume 6992, Micro-Optics 2008; 699215 (2008); doi: 10.1117/12.781103
Event: SPIE Photonics Europe, 2008, Strasbourg, France
Abstract
The design and performance of a highly miniaturized spectrometer fabricated using MEMS technologies are reported in this paper. Operation is based on an imaging diffraction grating. Minimizing fabrication complexity and assembly of the micromachined optical and electronic parts of the microspectrometer implies a planar design. It consists of two parallel glass plates, which contain all spectrograph components, including slit and diffraction grating, and can be fabricated on a single glass wafer with standard lithography. A simple analytical model for determining spectral resolution from device dimensions was developed and used for finding the optimal parameters of a miniaturized spectrometer as a compromise between size and spectral resolution. The fabricated spectrometer is very compact (11 × 1.5 × 3 mm3), which allowed mounting directly on top of an image sensor. The realized spectrometer features a 6 nm spectral resolution over a 100 nm operating range from 600 nm to 700 nm, which was tested using a Ne light source.
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S. Grabarnik, A. Emadi, H. Wu, G. De Graaf, G. Vdovin, R. F. Wolffenbuttel, "IC-compatible microspectrometer using a planar imaging diffraction grating", Proc. SPIE 6992, Micro-Optics 2008, 699215 (14 May 2008); doi: 10.1117/12.781103; https://doi.org/10.1117/12.781103
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KEYWORDS
Spectroscopy

Diffraction gratings

Spectral resolution

Glasses

Diffraction

Optical design

Lithography

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