期刊
ACS PHOTONICS
卷 7, 期 5, 页码 1153-1162出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b01776
关键词
multipole decomposition technique; plasmonic antennas; extended point multipole theory; polarizability retrieval; multipole polarizability; multiple-scattering theory
类别
资金
- National Research Foundation (NRF) - Ministry of Science and ICT (MSIT), Korea [NRF-2019R1A2C3003129, CAMM-2019M3A6B3030637, NRF-2019R1A5A8080290, NRF-2018M3D1A1058998]
- NRF-MSIT, Korea [NRF-2017H1A2A1043322]
- Hyundai Motor Chung Mong-Koo Foundation
- NRF fellowship by Ministry of Education, Korea [NRF-2019R1A6A3A13091132]
- National Research Foundation of Korea [2018M3D1A1058997] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In nanophotonics, multipole framework has become an indispensable theoretical tool for analyzing subwavelength meta-atoms and their radiation properties. This work presents higher-order exact dynamic polarizability (alpha) tensors, which can fully represent anisotropic meta-atoms with higher-order multipole transitions. By using the irreducible exact Cartesian multipoles and field components as the basis, the exact alpha-tensor rigorously reflects symmetry information on particles, including reciprocity. In addition, the exact alpha-tensor can be obtained from a T-matrix simply using basis transformation. Finally, we show that the description of meta-atoms using alpha-tensors incorporated with a multiple-scattering theory vastly extends the applicability of the multipole framework in nanophotonics, allowing accurate and efficient depiction of complicated, random, multiscale systems.
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