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Open AccessArticle

Experiment and Simulation of a Selective Subwavelength Filter with a Low Index Contrast

1
Institute of Engineering Thermophysics, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Institute of Material Research and Engineering, A*STAR Research Entities, 1 Fusionopolis Way, Singapore 138632, Singapore
4
Singapore Institute of Manufacturing Technology, A*STAR Research Entities, 1 Fusionopolis Way, Singapore 138632, Singapore
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2019, 9(10), 1497; https://doi.org/10.3390/nano9101497
Received: 6 September 2019 / Revised: 29 September 2019 / Accepted: 14 October 2019 / Published: 21 October 2019
(This article belongs to the Special Issue Design of Nanostructured Optic and Optoelectronic Devices)
Subwavelength gratings have been of great interest recently due to their ability to eliminate multiple orders. However, high index contrast ( Δ n 3 ) is typically achieved using metals or high-index dielectrics surrounded by vacuum in order to maintain good optical selectivity. Here, we theoretically propose and experimentally realize a selective subwavelength grating using an index contrast of Δ n 1.2 without vacuum. Despite its low index contrast, our simulation and experiments show that good optical selectivity is achieved using the same physics as subwavelength gratings made of high-index contrast. Such polymer-based encapsulated gratings are easier to scale up for use in large-area applications such as photovoltaics and lighting. View Full-Text
Keywords: contrast; nanophotonics; grating; selective contrast; nanophotonics; grating; selective
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Li, T.; Asbahii, M.; Lim, J.-Y.; Xie, H.; Koh, C.-W.; Goh, M.-H.; Ong, K.-S.; Zhang, H.; Ding, D. Experiment and Simulation of a Selective Subwavelength Filter with a Low Index Contrast. Nanomaterials 2019, 9, 1497.

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