Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters
In modern day photonic integrated circuitries (ICs), near-field Coulomb interaction plays an important role in the device performances. In fact, harvesting Coulomb effect intelligently can immensely help to realize advanced photonic devices in micro and nano length scales. In this context, electrica...
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sg-ntu-dr.10356-1562242023-02-28T20:04:05Z Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters Kumar, Deepak Gupta, Manoj Srivastava, Yogesh Kumar Devi, Koijam Monika Kumar, Ranjan Chowdhury, Dibakar Roy School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute Science::Physics::Optics and light Active Metamaterials Near Field Coupling In modern day photonic integrated circuitries (ICs), near-field Coulomb interaction plays an important role in the device performances. In fact, harvesting Coulomb effect intelligently can immensely help to realize advanced photonic devices in micro and nano length scales. In this context, electrically coupled terahertz metasurfaces are investigated for weak and strong near field coupling regimes under the influence of variable photo excitations. Our study demonstrates active tuning of metasurface resonances at relatively low pump powers (up to 10 mW (pump fluence of 12.7 µJ/cm2) and 20 mW (pump fluence of 25.4 µJ/cm2) for strong and weak near field coupling regimes, respectively). We attribute photo induced modifications of substrate electronic properties along with modifications of near-field interactions to be responsible for the resonance modulations. Further, we have demonstrated Coulomb effect parameter can be dynamically tunable with variable pump power. Our study reveals that change in Coulomb parameter is more pronounced for weak near field coupling regime (more than 6 times enhancement in Coulomb parameter) in comparison to strong near field coupling regime. In addition, the optical switching of the fundamental resonance is validated utilizing numerically simulated patterns of surface current & electric field. We envisage such active modulation of Coulomb effects in near-field coupled metasurfaces can lead to realize dynamically tunable terahertz metaphotonic devices. Submitted/Accepted version D K gratefully acknowledges financial assistance from the Department of Science and Technology (DST) INSPIRE doctoral research fellowship, Ministry of Science and Technology, Government of India. D R C acknowledges partial support from the Department of Science and Technology (DST), Project No. CRG/2019/001656. 2022-04-15T10:01:43Z 2022-04-15T10:01:43Z 2022 Journal Article Kumar, D., Gupta, M., Srivastava, Y. K., Devi, K. M., Kumar, R. & Chowdhury, D. R. (2022). Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters. Journal of Optics, 24(4), 045101-. https://dx.doi.org/10.1088/2040-8986/ac4d71 2040-8978 https://hdl.handle.net/10356/156224 10.1088/2040-8986/ac4d71 4 24 045101 en Journal of Optics © 2022 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Optics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://doi.org/10.1088/2040-8986/ac4d71. application/pdf |
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Science::Physics::Optics and light Active Metamaterials Near Field Coupling Kumar, Deepak Gupta, Manoj Srivastava, Yogesh Kumar Devi, Koijam Monika Kumar, Ranjan Chowdhury, Dibakar Roy Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters |
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In modern day photonic integrated circuitries (ICs), near-field Coulomb interaction plays an important role in the device performances. In fact, harvesting Coulomb effect intelligently can immensely help to realize advanced photonic devices in micro and nano length scales. In this context, electrically coupled terahertz metasurfaces are investigated for weak and strong near field coupling regimes under the influence of variable photo excitations. Our study demonstrates active tuning of metasurface resonances at relatively low pump powers (up to 10 mW (pump fluence of 12.7 µJ/cm2) and 20 mW (pump fluence of 25.4 µJ/cm2) for strong and weak near field coupling regimes, respectively). We attribute photo induced modifications of substrate electronic properties along with modifications of near-field interactions to be responsible for the resonance modulations. Further, we have demonstrated Coulomb effect parameter can be dynamically tunable with variable pump power. Our study reveals that change in Coulomb parameter is more pronounced for weak near field coupling regime (more than 6 times enhancement in Coulomb parameter) in comparison to strong near field coupling regime. In addition, the optical switching of the fundamental resonance is validated utilizing numerically simulated patterns of surface current & electric field. We envisage such active modulation of Coulomb effects in near-field coupled metasurfaces can lead to realize dynamically tunable terahertz metaphotonic devices. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Kumar, Deepak Gupta, Manoj Srivastava, Yogesh Kumar Devi, Koijam Monika Kumar, Ranjan Chowdhury, Dibakar Roy |
format |
Article |
author |
Kumar, Deepak Gupta, Manoj Srivastava, Yogesh Kumar Devi, Koijam Monika Kumar, Ranjan Chowdhury, Dibakar Roy |
author_sort |
Kumar, Deepak |
title |
Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters |
title_short |
Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters |
title_full |
Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters |
title_fullStr |
Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters |
title_full_unstemmed |
Photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on Coulomb parameters |
title_sort |
photoinduced dynamic tailoring of near-field coupled terahertz metasurfaces and its effect on coulomb parameters |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/156224 |
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1759853591769645056 |