Tunable toroidal excitation in a reconfigurable terahertz metamaterial
ORAL
Abstract
Compared with the traditional electric and magnetic multipolar excitation, the existence of a dynamic toroidal moment has received increasing interest in recent years due to its novel electromagnetic response. In this work, we present unique reconfigurable terahertz metamaterials where artificial toroidal metamolecules and traditional MEMS bi-material cantilever structures are integrated within the same unit cell. Through modification of the bending angle through thermal stimulus, the intensity of the toroidal moment increases by approximately 5 orders of magnitude. The toroidal excitation is measured using terahertz time-domain spectroscopy and confirmed numerically with a multipole decomposition method. Our results demonstrate the use of bi-material cantilevers to realize a tunable toroidal moment.
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Presenters
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Chunxu Chen
Boston University, Mechanical Engineering, Boston University
Authors
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Chunxu Chen
Boston University, Mechanical Engineering, Boston University
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Kelson Kaj
University of California San Diego, Physics, University of California San Diego, Department of Physics, University of California, San Diego, University of California, San Diego
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Yuwei Huang
Boston University
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Xiaoguang Zhao
Boston University, Mechanical Engineering, Boston University
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Richard Averitt
University of California, San Diego, University of California San Diego, UC San Diego, Physics, University of California San Diego, Department of Physics, University of California, San Diego, University of California
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Xin Zhang
Boston University, Mechanical Engineering, Boston University