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Title: Dielectric metamaterials with toroidal dipolar response

Toroidal multipoles are the terms missing in the standard multipole expansion; they are usually overlooked due to their relatively weak coupling to the electromagnetic fields. Here, we propose and theoretically study all-dielectric metamaterials of a special class that represent a simple electromagnetic system supporting toroidal dipolar excitations in the THz part of the spectrum. In addition, we show that resonant transmission and reflection of such metamaterials is dominated by toroidal dipole scattering, the neglect of which would result in a misunderstanding interpretation of the metamaterials’ macroscopic response. Due to the unique field configuration of the toroidal mode, the proposed metamaterials could serve as a platform for sensing or enhancement of light absorption and optical nonlinearities.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5]
  1. Institute of Electronic Structure and Laser (IESL), Crete (Greece); National Research Univ. "Moscow Power Engineering Institute", Moscow (Russia)
  2. Institute of Electronic Structure and Laser (IESL), Crete (Greece); Univ. of Crete, Heraklion (Greece)
  3. Institute of Electronic Structure and Laser (IESL), Crete (Greece); Iowa State Univ., Ames, IA (United States)
  4. Univ. of Southampton (United Kingdom)
  5. Univ. of Southampton (United Kingdom); Nanyang Technological Univ. (Singapore)
Publication Date:
OSTI Identifier:
1176978
Report Number(s):
IS-J-8811
Journal ID: ISSN 2160-3308; PRXHAE
Grant/Contract Number:
AC02-07CH11358; 13-02-00732; 13-08-01278; MOE2011-T3-1-005; 6260
Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE