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Open AccessArticle

Miniature Spectroscopes with Two-Dimensional Guided-Mode Resonant Metal Grating Filters Integrated on a Photodiode Array

Department of Finemechanics, Tohoku University, Miyagi 980-8579, Japan
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Author to whom correspondence should be addressed.
Materials 2018, 11(10), 1924; https://doi.org/10.3390/ma11101924
Received: 18 September 2018 / Revised: 3 October 2018 / Accepted: 5 October 2018 / Published: 10 October 2018
(This article belongs to the Special Issue New Horizon of Plasmonics and Metamaterials)
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Abstract

A small spectroscope with 25 color sensors was fabricated by combining metamaterial color filters and Si photodiodes. The metamaterial color filters consisted of guided-mode resonant metal gratings with subwavelength two-dimensional periodic structures. Transmittance characteristics of the color filters were designed to obtain peak wavelengths proportional to grating periods. For each color sensor, a peak wavelength of the spectral sensitivity could be tuned in the range of visible wavelengths by adjusting each grating period. By performing spectrum reconstruction using Tikhonov regularization, the spectrum of an incident light was obtained from the signal of photodiodes. Several monochromatic lights were made incident on the fabricated device and the spectral characteristics of the incident light were reconstructed from the output signals obtained from the respective color sensors. The peak wavelengths of the reconstructed spectra were in good agreement with the center wavelengths of the monochromatic lights. View Full-Text
Keywords: spectroscopes; metamaterial; plasmonics; structural color filters; photodiodes spectroscopes; metamaterial; plasmonics; structural color filters; photodiodes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kanamori, Y.; Ema, D.; Hane, K. Miniature Spectroscopes with Two-Dimensional Guided-Mode Resonant Metal Grating Filters Integrated on a Photodiode Array. Materials 2018, 11, 1924.

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