Experimental observation of mutual coupling in resonator array on thin-metal-film
Abstract
We present the experimental observation of electromagnetic mutual coupling in an array of ring-shaped resonators (meta-atoms) fabricated on a free-standing thin metal film using a maskless direct laser ablation technique. The transmission spectra of various resonator configurations were measured via terahertz time-domain spectroscopy and a vector network analysis. Numerical modeling of periodically arranged resonators, employing multipole decomposition, revealed a clear dependence of inter-element coupling on the number of meta-atoms in the array. Theoretical analysis of electric and magnetic dipoles and quadrupoles elucidates the nature of resonance peak splitting and broadening, resulting in a reduction in the quality factor as the number of meta-atoms increases. We anticipate that observed inter-element coupling behavior along with multipole mode analysis could advance the development of multi-pixel emitters, 2D plasmonic THz sources, sensors, electro-optical modulators, and resonators for subwavelength photonic and plasmonic applications.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (8)
Surya Revanth Ayyagari
Terahertz Photonics Laboratory, Center for Physical Sciences and Technology (FTMC) 1 , Saulėtekio ave. 3, Vilnius LT-10257,
Simonas Indrišiūnas
Laser Microfabrication Laboratory, Center for Physical Sciences and Technology (FTMC) 2 , Savanoriu ave. 231, Vilnius LT-02300,
Alexey Basharin
Theoretical Physics and Quantum Technologies Department, National University of Science and Technology MISIS 1 , 119049 Moscow,
Vytautas Janonis
Terahertz Photonics Laboratory, Center for Physical Sciences and Technology (FTMC) 1 , Saulėtekio ave. 3, Vilnius LT-10257,
Daniil Pashnev
Terahertz Photonics Laboratory, Center for Physical Sciences and Technology (FTMC) 1 , Saulėtekio ave. 3, Vilnius LT-10257,
Guillaume Ducournau
Institut d’Electronique de Microélectronique et de Nanotechnologie (IEMN), Université de Lille 4 Villeneuve d’Ascq 59652,
Polina Kuzhir
Center for Photonics Sciences, University of Eastern Finland 1 , P.O. Box 111, FI-80101, Joensuu 80100,
Irmantas Kašalynas
Department of Optoelectronics, Center for Physical Sciences and Technology (FTMC) 4 , Sauletekio av. 3, Vilnius 10257,