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Title: Ultra-high Q even eigenmode resonance in terahertz metamaterials

We report the simultaneous excitation of the odd and the even eigenmode resonances in a periodic array of square split-ring resonators, with four resonators per unit cell. When the electric field is parallel to their gaps, only the two well-studied odd eigenmodes are excited. As the resonators are rotated relative to one another, we observe the emergence and excitation of an extremely sharp even eigenmode. In uncoupled split-ring resonators, this even eigenmode is typically radiative in nature with a broad resonance linewidth and low Q-factor. However, in our coupled system, for specific range of rotation angles, our simulations revealed a remarkably high quality factor (Q ∼ 100) for this eigenmode, which has sub-radiant characteristics. This type of quad-supercell metamaterial offers the advantage of enabling access to all the three distinct resonance features of the split-ring resonator, which consists of two odd eigenmodes in addition to the high-Q even eigenmode, which could be exploited for high performance multiband filters and absorbers. The high Q even eigenmode could find applications in designing label free bio-sensors and for studying the enhanced light matter interaction effects.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston, Ontario K7L 3N6 (Canada)
  2. School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)
  3. Centre for Disruptive Photonic Technologies, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore 637371 (Singapore)
Publication Date:
OSTI Identifier:
22395632
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRIC FIELDS; EXCITATION; FILTERS; METAMATERIALS; PERFORMANCE; PERIODICITY; QUALITY FACTOR; RESONANCE; ROTATION; SENSORS; SPLIT-RING RESONATORS; THZ RANGE; VISIBLE RADIATION