Plasmonics properties of nano-torus: An FEM method |
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| Authors: | Qiang Shi Zhongyuan Yu Yumin Liu Hui Gong Haozhi Yin Wen Zhang Jiantao Liu Yiwei Peng |
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| Affiliation: | 1. Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-14766 Tabriz, Iran;2. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749 South Korea;1. Department of Environmental Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea;2. Division of General Education, Kwangwoon University, Seoul 139-701, Republic of Korea;1. Graduate School of Advanced Integration of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba, Japan;2. Institute for Catalysis and Division of Quantum Science and Technology, Graduate School of Engineering, Hokkaido University, Kita 21-10, Sapporo, Japan;3. Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba, Japan;4. Physics Department, Washington University, Seattle, WA 98185, USA;1. National Institute of Material Physics, Lab. Optical Processes in Nanostructured Materials, P.O. Box MG-7, R-77125 Bucharest, Romania;2. University of Bucharest, Faculty of Physics, 077125 Bucharest, Romania;1. Lund University, Box 118, SE-221 00 Lund, Sweden;2. Department of Mathematics and Statistics, University of Reading, Reading RG6 6AX, United Kingdom |
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| Abstract: | Nano-torus particles are promising in nano-photonics applications. In this paper, we investigate the plasmonics resonant spectrum of torus and the corresponding horizontal and vertical dimers with the finite element method (FEM) based on strict electromagnetic theory. Compared with sphere, single torus and horizontal dimer under perpendicular polarization are characterized with narrower line width and wider tunability throughout visible and infrared frequencies. These properties make single torus and horizontal dimer suitable for high sensitivity sensing. Furthermore, Purcell factor and local field enhancement of horizontal dimer which are important to high efficient single photon devices are one order of magnitude higher than those of single torus respectively. However, vertical dimer under perpendicular polarization has no above advanced characteristics. |
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