| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Unidirectional plasmonic Bragg reflector based on longitudinally asymmetric nanostructures |
| Mingsong Chen(陈名松)1, Lulu Pan(潘璐璐)1,2, Yuanfu Lu(鲁远甫)2, Guangyuan Li(李光元)2 |
1 School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China;
2 Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China |
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Abstract Plasmonic Bragg reflectors are essential components in plasmonic circuits. Here we propose a novel type of plasmonic Bragg reflector, which has very high reflectance for the right-side incidence and meanwhile has extremely large absorption for the left-side incidence. This device is composed of longitudinally asymmetric nanostructures in a metal-insulator-metal waveguide. In order to efficiently analyze, design, and optimize the reflection and transmission characteristics of the proposed device, we develop a semi-analytic coupled-mode model. Results show that the reflectance extinction ratio between plasmonic modes incident from the right-side and the left-side reaches 11 dB. We expect this device with such striking unidirectional reflection performance can be used as insulators in nanoplasmonic circuits.
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Received: 19 April 2019
Revised: 14 May 2019
Accepted manuscript online:
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PACS:
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42.79.Fm
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(Reflectors, beam splitters, and deflectors)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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| Fund: Project supported by the Shenzhen Research Foundation, China (Grant Nos. JCYJ20160608153308846, JSGG20170822093953679, and JCYJ20180507182444250), the National Key Research and Development Program of China (Grant No. 2017YFC0803506), the National Natural Science Foundation of China (Grant Nos. 61261033 and 61162007), and the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 20160320). |
Corresponding Authors:
Yuanfu Lu, Guangyuan Li
E-mail: yf.lu@siat.ac.cn;gy.li@siat.ac.cn
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Cite this article:
Mingsong Chen(陈名松), Lulu Pan(潘璐璐), Yuanfu Lu(鲁远甫), Guangyuan Li(李光元) Unidirectional plasmonic Bragg reflector based on longitudinally asymmetric nanostructures 2019 Chin. Phys. B 28 074208
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