Forward and backward unidirectional scattering by the core-shell nanocube dimer with balanced gain and loss
Name
nanomaterials-10-01440.pdf
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3.27 MB
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Checksum (MD5)
9ba51e1cb4a5a4c32c1dc41ba1699356
Author(s)
Lv, Jingwei
Zhang, Xiaoming
Yu, Xuntao
Mu, Haiwei
Liu, Qiang
Liu, Chao
Sun, Tao
Chu, Paul K.
Date Issued
July 23, 2020
Journal
Nanomaterials
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Lu, Jingwei et al. "Forward and backward unidirectional scattering by the core-shell nanocube dimer with balanced gain and loss." Nanomaterials 10, 8 (July 2020): 1440 ©2020 Author(s)
Version
Final published version
Abstract
An optical nanoantenna consisting of a Au-dielectric core-shell nanocube dimer with switchable directionality was designed and described. Our theoretical model and numerical simulation showed that switching between forward and backward directions can be achieved with balanced gain and loss, using a single element by changing the coefficient κ in the core, which can be defined by the relative phase of the polarizability. The optical response indicated a remarkable dependence on the coefficient κ in the core as well as frequency. The location of the electric field enhancement was specified by the different coefficient κ and, furthermore, the chained optical nanoantenna and coupled electric dipole emitted to the optical nanoantenna played significant roles in unidirectional scattering. This simple method to calculate the feasibility of unidirectional and switchable scattering provides an effective strategy to explore the functionalities of nanophotonic devices.
MIT Department
Massachusetts Institute of Technology. Media Laboratory
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.3390/nano10081440
