Compact folded metasurface spectrometer
An optical design space that can highly benefit from the recent developments in metasurfaces is the folded optics architecture where light is confined between reflective surfaces, and the wavefront is controlled at the reflective interfaces. In this manuscript, we introduce the concept of folded metasurface optics by demonstrating a compact spectrometer made from a 1-mm-thick glass slab with a volume of 7 cubic millimeters. The spectrometer has a resolution of ~1.2 nm, resolving more than 80 spectral points from 760 to 860 nm. The device is composed of three reflective dielectric metasurfaces, all fabricated in a single lithographic step on one side of a substrate, which simultaneously acts as the propagation space for light. The folded metasystem design can be applied to many optical systems, such as optical signal processors, interferometers, hyperspectral imagers, and computational optical systems, significantly reducing their sizes and increasing their mechanical robustness and potential for integration.
© The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received 01 August 2018; Accepted 05 September 2018; Published 10 October 2018. Data availability: The data that support the findings of this study are available from the corresponding author upon request. This work was supported by Samsung Electronics. M.F. was partly supported by The Natural Sciences and Engineering Research Council of Canada (NSERC). S.M.K. is supported as part of the Department of Energy (DOE) "Light-Material Interactions in Energy Conversions" Energy Frontier Research Center under grant no. DE-SC0001293. The device nano-fabrication was performed at the Kavli Nanoscience Institute at Caltech. We would like to thank Dr. Tian Zhong for providing the Nd:YVO_4 sample, and Dr. Seunghoon Han and Dr. Duhyun Lee for useful discussions. Author Contributions: M.F., E.A., A.A. and A.F. conceived the experiment. M.F. and E.A. fabricated the samples. M.F, E.A., A.A., S.M.K. and H.K. performed the simulations, measurements, and analyzed the data. M.F., E.A., A.A. and A.F. co-wrote the manuscript. All authors discussed the results and commented on the manuscript. The authors declare no competing interests.
Published - s41467-018-06495-5.pdf
Submitted - 1807.10985.pdf
Supplemental Material - 41467_2018_6495_MOESM1_ESM.pdf
Supplemental Material - 41467_2018_6495_MOESM2_ESM.pdf
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