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Title: Role of surface electromagnetic waves in metamaterial absorbers

Metamaterial absorbers have been demonstrated across much of the electromagnetic spectrum and exhibit both broad and narrow-band absorption for normally incident radiation. Absorption diminishes for increasing angles of incidence and transverse electric polarization falls off much more rapidly than transverse magnetic. We unambiguously demonstrate that broad-angle TM behavior cannot be associated with periodicity, but rather is due to coupling with a surface electromagnetic mode that is both supported by, and well described via the effective optical constants of the metamaterial where we achieve a resonant wavelength that is 19.1 times larger than the unit cell. Furthermore, experimental results are supported by simulations and we highlight the potential to modify the angular response of absorbers by tailoring the surface wave.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [3] ;  [2] ;  [4]
  1. Boston College, Chestnut Hill, MA (United States)
  2. Duke Univ., Durham, NC (United States)
  3. SensorMetrix, Inc., San Diego, CA (United States)
  4. Boston College, Chestnut Hill, MA (United States); Duke Univ., Durham, NC (United States)
Publication Date:
OSTI Identifier:
1242435
Grant/Contract Number:
SC0005240
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 6; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; metamaterials; surface waves; infrared; scattering measurements