Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.4969061
Title: Active control of electromagnetically induced transparency with dual dark mode excitation pathways using MEMS based tri-atomic metamolecules
Authors: Pitchappa, Prakash 
Manjappa, Manukumara
Ho, Chong Pei 
Singh, Ranjan
Singh, Navab
Lee, Chengkuo 
Keywords: Science & Technology
Physical Sciences
Physics, Applied
Physics
TERAHERTZ METAMATERIALS
DYNAMIC MANIPULATION
RESONANCES
FABRICATION
ANISOTROPY
ANALOG
WAVES
Issue Date: 2016
Publisher: AMER INST PHYSICS
Citation: Pitchappa, Prakash, Manjappa, Manukumara, Ho, Chong Pei, Singh, Ranjan, Singh, Navab, Lee, Chengkuo (2016/11/21). Active control of electromagnetically induced transparency with dual dark mode excitation pathways using MEMS based tri-atomic metamolecules. APPLIED PHYSICS LETTERS 109 (21). ScholarBank@NUS Repository. https://doi.org/10.1063/1.4969061
Abstract: We report experimental results of the active switching of electromagnetically induced transparency (EIT) analogue by controlling the dark mode excitation pathways in a microelectromechanical system based tri-atomic metamolecule, operating in the terahertz spectral region. The tri-atomic metamolecule consists of two bright cut wire resonators (CWRs) on either side of the dark split ring resonators (SRRs). Each of the CWRs can independently excite the dark inductive-capacitive resonance mode of the SRRs through inductive coupling, and this allows for the dual pathways of dark mode excitation. The CWRs are made movable along the out-of-plane direction and electrically isolated to achieve selective reconfiguration. Hence, by controlling the physical position of these CWRs, the excitation pathways can be actively reconfigured. This enables the strong excitation of EIT analogue at 0.65 THz, only when one of the pathways is made accessible. Moreover, the transparency peak is completely modulated when both pathways are made either inaccessible or equally accessible. The proposed approach of realizing independent control of constituent resonators in a multi-resonator coupled system, enables the realization of efficient slow light devices and tunable high-Q resonators in terahertz spectral region.
Source Title: APPLIED PHYSICS LETTERS
URI: https://scholarbank.nus.edu.sg/handle/10635/188921
ISSN: 00036951
10773118
DOI: 10.1063/1.4969061
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