Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials

In this work, we experimentally investigate near-field capacitive coupling between a pair of single-gap split ring resonators (SRRs) in a terahertz metamaterial. The unit cell of our design comprises of two coupled SRRs with the split gaps facing each other. The coupling between two SRRs is examined...

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Main Authors: Rao, S. Jagan Mohan, Srivastava, Yogesh Kumar, Kumar, Gagan, Roy Chowdhury, Dibakar
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/88910
http://hdl.handle.net/10220/46985
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-889102023-02-28T19:30:42Z Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials Rao, S. Jagan Mohan Srivastava, Yogesh Kumar Kumar, Gagan Roy Chowdhury, Dibakar School of Physical and Mathematical Sciences Resonance Terahertz DRNTU::Science::Physics In this work, we experimentally investigate near-field capacitive coupling between a pair of single-gap split ring resonators (SRRs) in a terahertz metamaterial. The unit cell of our design comprises of two coupled SRRs with the split gaps facing each other. The coupling between two SRRs is examined by changing the gap of one resonator with respect to the other for several inter resonator separations. When split gap size of one resonator is increased for a fixed inter-resonator distance, we observe a split in the fundamental resonance mode. This split ultimately results in the excitation of narrow band low frequency resonance mode along with a higher frequency mode which gets blue shifted when the split gap increases. We attribute resonance split to the excitation of symmetric and asymmetric modes due to strong capacitive or electric interaction between the near-field coupled resonators, however blue shift of the higher frequency mode occurs mainly due to the reduced capacitance. The ability of near-field capacitive coupled terahertz metamaterials to excite split resonances could be significant in the construction of modulator and sensing devices beside other potential applications for terahertz domain. Published version 2018-12-17T03:36:24Z 2019-12-06T17:13:34Z 2018-12-17T03:36:24Z 2019-12-06T17:13:34Z 2018 Journal Article Rao, S. J. M., Srivastava, Y. K., Kumar, G., & Roy Chowdhury, D. (2018). Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials. Scientific Reports, 8(1), 16773-. doi: 10.1038/s41598-018-34942-2 https://hdl.handle.net/10356/88910 http://hdl.handle.net/10220/46985 10.1038/s41598-018-34942-2 en Scientific Reports © 2018 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. 8 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Resonance
Terahertz
DRNTU::Science::Physics
spellingShingle Resonance
Terahertz
DRNTU::Science::Physics
Rao, S. Jagan Mohan
Srivastava, Yogesh Kumar
Kumar, Gagan
Roy Chowdhury, Dibakar
Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
description In this work, we experimentally investigate near-field capacitive coupling between a pair of single-gap split ring resonators (SRRs) in a terahertz metamaterial. The unit cell of our design comprises of two coupled SRRs with the split gaps facing each other. The coupling between two SRRs is examined by changing the gap of one resonator with respect to the other for several inter resonator separations. When split gap size of one resonator is increased for a fixed inter-resonator distance, we observe a split in the fundamental resonance mode. This split ultimately results in the excitation of narrow band low frequency resonance mode along with a higher frequency mode which gets blue shifted when the split gap increases. We attribute resonance split to the excitation of symmetric and asymmetric modes due to strong capacitive or electric interaction between the near-field coupled resonators, however blue shift of the higher frequency mode occurs mainly due to the reduced capacitance. The ability of near-field capacitive coupled terahertz metamaterials to excite split resonances could be significant in the construction of modulator and sensing devices beside other potential applications for terahertz domain.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Rao, S. Jagan Mohan
Srivastava, Yogesh Kumar
Kumar, Gagan
Roy Chowdhury, Dibakar
format Article
author Rao, S. Jagan Mohan
Srivastava, Yogesh Kumar
Kumar, Gagan
Roy Chowdhury, Dibakar
author_sort Rao, S. Jagan Mohan
title Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
title_short Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
title_full Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
title_fullStr Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
title_full_unstemmed Modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
title_sort modulating fundamental resonance in capacitive coupled asymmetric terahertz metamaterials
publishDate 2018
url https://hdl.handle.net/10356/88910
http://hdl.handle.net/10220/46985
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