http://scholars.ntou.edu.tw/handle/123456789/1758
Title: | Perfect Dual-Band Absorber Based on Plasmonic Effect with the Cross-Hair/Nanorod Combination | Authors: | Yuan-Fong Chou Chau Chung-Ting Chou Chao Hung Ji Huang Muhammad Raziq Rahimi Kooh N. T. R. N. Kumara Chee Ming Lim Hai-Pang Chiang |
Keywords: | plasmonic effect;localized plasmon modes;dual-band plasmonic perfect absorber;absorptance peaks;plasmonic sensor | Issue Date: | 9-Mar-2020 | Journal Volume: | 10 | Journal Issue: | 3 | Start page/Pages: | 493 | Source: | Nanomaterials | Abstract: | Plasmonic effect using a cross-hair can convey strongly localized surface plasmon modes among the separated composite nanostructures. Compared to its counterpart without the cross-hair, this characteristic has the remarkable merit of enhancing absorptance at resonance and can make the structure carry out a dual-band plasmonic perfect absorber (PPA). In this paper, we propose and design a novel dual-band PPA with a gathering of four metal-shell nanorods using a cross-hair operating at visible and near-infrared regions. Two absorptance peaks at 1050 nm and 750 nm with maximal absorptance of 99.59% and 99.89% for modes 1 and 2, respectively, are detected. High sensitivity of 1200 nm refractive unit (1/RIU), figure of merit of 26.67 and Q factor of 23.33 are acquired, which are very remarkable compared with the other PPAs. In addition, the absorptance in mode 1 is about nine times compared to its counterpart without the cross-hair. The proposed structure gives a novel inspiration for the design of a tunable dual-band PPA, which can be exploited for plasmonic sensor and other nanophotonic devices. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/1758 | DOI: | 10.3390/nano10030493 |
Appears in Collections: | 光電與材料科技學系 |
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