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Title: Active control of near-field coupling in conductively coupled microelectromechanical system metamaterial devices
Authors: Pitchappa, Prakash
Manjappa, Manukumara
Ho, Chong Pei
Qian, You
Singh, Ranjan
Singh, Navab
Lee, Chengkuo
Keywords: Metamaterials
Microelectromechanical systems
Issue Date: 2016
Source: Pitchappa, P., Manjappa, M., Ho, C. P., Qian, Y., Singh, R., Singh, N., et al. (2016). Active control of near-field coupling in conductively coupled microelectromechanical system metamaterial devices. Applied Physics Letters, 108(11), 111102-.
Series/Report no.: Applied Physics Letters
Abstract: We experimentally report a structurally reconfigurable metamaterial for active switching of near-field coupling in conductively coupled, orthogonally twisted split ring resonators (SRRs) operating in the terahertz spectral region. Out-of-plane reconfigurable microcantilevers integrated into the dark SRR geometry are used to provide active frequency tuning of dark SRR resonance. The geometrical parameters of individual SRRs are designed to have identical inductive-capacitive resonant frequency. This allows for the excitation of classical analogue of electromagnetically induced transparency (EIT) due to the strong conductive coupling between the SRRs. When the microcantilevers are curved up, the resonant frequency of dark SRR blue-shifts and the EIT peak is completely modulated while the SRRs are still conductively connected. EIT modulation contrast of ∼50% is experimentally achieved with actively switchable group delay of ∼2.5 ps. Electrical control, miniaturized size, and readily integrable fabrication process of the proposed structurally reconfigurable metamaterial make it an ideal candidate for the realization of various terahertz communication devices such as electrically controllable terahertz delay lines, buffers, and tunable data-rate channels.
ISSN: 0003-6951
DOI: 10.1063/1.4943974
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2016 AIP Publishing LLC. This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of AIP Publishing LLC. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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