Optical Anapole Metamaterial

Pin Chieh Wu; Chun Yen Liao; Vassili Savinov; Tsung Lin Chung; Wei Ting Chen; Yao-Wei Huang; Pei Ru Wu; Yi-Hao Chen; Ai-Qun Liu; Nikolay I. Zheludev; Din Ping Tsai

doi:10.1021/acsnano.7b08828

journal article·2018-02-27

Optical Anapole Metamaterial

Pin Chieh Wu, Chun Yen Liao, Vassili Savinov, Tsung Lin Chung, Wei Ting Chen, Yao-Wei Huang, Pei Ru Wu, Yi-Hao Chen, Ai-Qun Liu, Nikolay I. Zheludev, Din Ping Tsai

ACS Nano· Volume 12· Issue 2

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Source abstract

Abstract

The toroidal dipole is a localized electromagnetic excitation independent from the familiar magnetic and electric dipoles. It corresponds to currents flowing along minor loops of a torus. Interference of radiating induced toroidal and electric dipoles leads to anapole, a nonradiating charge-current configuration. Interactions of induced toroidal dipoles with electromagnetic waves have recently been observed in artificial media at microwave, terahertz, and optical frequencies. Here, we demonstrate a quasi-planar plasmonic metamaterial, a combination of dumbbell aperture and vertical split-ring resonator, that exhibits transverse toroidal moment and resonant anapole behavior in the optical part of the spectrum upon excitation with a normally incident electromagnetic wave. Our results prove experimentally that toroidal modes and anapole modes can provide distinct and physically significant contributions to the absorption and dispersion of slabs of matter in the optical part of the spectrum in conventional transmission and reflection experiments.

Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Metamaterials and Metasurfaces Applications · Plasmonic and Surface Plasmon Research · Orbital Angular Momentum in Optics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan

Department of Physics, National Taiwan University, Taipei 10617, Taiwan

Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton SO17 1BJ, U.K.

School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore

TPI and Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore

College of Engineering, Chang Gung University, Taoyuan 33302, Taiwan

Funding

Engineering and Physical Sciences Research Council · Ministry of Education - Singapore · Academia Sinica · Ministry of Science and Technology, Taiwan · Nano-Electro-Mechanical-System Research Center, National Taiwan University · Research Center for Applied Sciences, Academia Sinica

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