Possible implementation of epsilon-near-zero metamaterials working at optical frequencies |
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| Authors: | Alessio Monti Filiberto Bilotti Alessandro Toscano Lucio Vegni |
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| Institution: | 1. Departamento de Física, Universidad de La Serena, Av. Juan Cisternas 1200, La Serena, Chile;2. Departamento de Física, Universidad de Tarapacá, Casilla 7-D, Arica, Chile;3. Instituto de Alta Investigación IAI, Universidad de Tarapacá, Casilla 7-D, Arica, Chile;1. Department of Applied Physics and Applied Mathematics, Columbia University, New York 10027, USA;2. School of Energy Science & Engineering, Harbin Institute of Technology, Harbin 150001, China;1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu 210023, China;2. ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Sydney, NSW 2006, Australia;3. School of Physics, Zhengzhou University, Zhengzhou 453000, China;4. Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100190, China;5. Department of Physics, Tohoku University, Sendai 980-8578, Japan;1. College of Electronics, Communication, and Physics, Shandong University of Science and Technology, Qingdao 266510, China;2. State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, PR China;1. School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, China;2. Department of Mathematics and Physics, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China |
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| Abstract: | Metamaterials (MTMs) exhibiting a near-zero real part of the permittivity function in a given frequency range have been demonstrated to be useful in several application fields, including field localization and focusing. So far, however, the realistic implementations of such materials working at optical frequencies and exhibiting a reasonable level of losses are rare. In this work, we propose a possible implementation of optical epsilon-near-zero (ENZ) MTMs based on the employment of an array of core-shell nano-spheres embedded in a dielectric medium. The core of the nano-spheres and the host medium are both made of silica, while the shell is formed by a plasmonic material (i.e. silver). Using classical homogenization formulas, we show that it is possible to design the array in such a way to exhibit near-zero values of the effective real permittivity with relatively low losses at optical frequencies. These results are supported and confirmed by proper full-wave simulations and design examples. |
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