Journal
OPTICS EXPRESS
Volume 26, Issue 13, Pages 16769-16781Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.016769
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Funding
- National Natural Science Foundation of China (NSFC) [11604110, 11774112]
- National Key Research and Development Program of China [2016YFC0201300]
- Innovation Foundation of Shenzhen Government [JCYJ20160429182829578]
- Fundamental Research Initiative Funds for Huazhong University of Science and Technology [2017KFYXJJ031]
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Here we numerically and experimentally explore the rich phenomena in the optical responses and local electromagnetic fields of a MIM absorber mediated by the dispersive spacer. We first show that the line shape of the spectral absorption is strongly modified by the interaction between the plasmonic resonances and the optical phonons in the silicon dioxide spacer. Importantly, broadening the spectral absorption in the long wave infrared range is achieved by tuning the strength of coupling. Modification to the local electromagnetic field distribution in the epsilon-near-zero region is also numerically studied. The incident-angle dependence and polarization dependence of the broadened absorption spectrum are evaluated. We also show that the spectral broadening mechanism can be generalized to other frequency bands by employing different spacing materials such as silicon nitride and polydimethylsiloxane. Our results can be useful for designing spectrally selective thermal detectors and thermal emitters. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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