| Issue |
EPL
Volume 138, Number 5, June 2022
|
|
|---|---|---|
| Article Number | 55001 | |
| Number of page(s) | 6 | |
| Section | Atomic, molecular and optical physics | |
| DOI | https://doi.org/10.1209/0295-5075/ac6e82 | |
| Published online | 08 June 2022 | |
Broadside-coupling–enabled insulator-to-metal transition in a terahertz metasurface
Department of Physics, Mahindra University - 62/1A, Bahadurpally, Hyderabad 500043, India
(a) dibakar.roychowdhury@mahindrauniversity.edu.in (corresponding author)
Received: 13 January 2022
Accepted: 11 May 2022
We theoretically demonstrate stacked-dipole-resonators–based (broadside near-field coupling configuration) multilayer metasurfaces separated by a vanadium dioxide film to achieve stronger field confinement in the spacer (VO2) region. Under relatively intense terahertz excitation (20 Vm−1) assisted by larger area electric field confinement, insulator-to-metal transition (IMT) in VO2 spacer is realized resulting in frequency (dipole mode) and amplitude (Fano mode) tunable metasurfaces. Enhancement in probing THz field triggers much stronger field confinement 
inside the spacer layer leading to increased VO2 conductivity (responsible for IMT) through the Poole-Frankel effect. Such broadside coupled IMT-based terahertz metamaterials can help in realizing active meta devices for THz domain.
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