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Special Issue:
SPECIAL TOPIC — 80th Anniversary of Northwestern Polytechnical University (NPU)
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| SPECIAL TOPIC—80th Anniversary of Northwestern Polytechnical University (NPU) |
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Subwavelength asymmetric Au-VO2 nanodisk dimer for switchable directional scattering |
| Han-Mou Zhang(张汉谋), Wu-Yun Shang(尚武云), Hua Lu(陆华), Fa-Jun Xiao(肖发俊), Jian-Lin Zhao(赵建林) |
| MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710129, China |
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Abstract We propose an asymmetric Au-VO2 nanodisk dimer for realizing a switchable directional scattering. Specifically, the directional scattering can be triggered on/off through controlling the phase transition of the VO2 nanodisk from metallic to semiconductor state. More strikingly, an obvious directional scattering with the directivity of~40 dB is achieved under the metallic state of VO2 nanodisk. This tunable directional scattering is further explained with an interference model where the Au and VO2 nanodisks are treated as two weakly interacting electric dipoles. The phase transition controlled scattering patterns of asymmetric Au-VO2 nanodisk dimer are then well interpreted from the phase difference between these two dipoles.
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Received: 14 July 2018
Revised: 07 September 2018
Accepted manuscript online:
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PACS:
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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42.70.-a
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(Optical materials)
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42.25.Fx
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(Diffraction and scattering)
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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 National Key R&D Program of China (Grant No. 2017YFA0303800), the National Natural Science Foundation of China (Grant Nos. 11634010, 61675170, and 11874050), the Natural Science Basic Research Plan in Shaanxi Province, China (Grant No. 2017JM6022), and the Fundamental Research Funds for the Central Universities, China (Grant No. 3102017zy017). |
Corresponding Authors:
Fa-Jun Xiao, Jian-Lin Zhao
E-mail: fjxiao@nwpu.edu.cn;jlzhao@nwpu.edu.cn
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Cite this article:
Han-Mou Zhang(张汉谋), Wu-Yun Shang(尚武云), Hua Lu(陆华), Fa-Jun Xiao(肖发俊), Jian-Lin Zhao(赵建林) Subwavelength asymmetric Au-VO2 nanodisk dimer for switchable directional scattering 2018 Chin. Phys. B 27 117301
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