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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15896–15903

Subcell misalignment in vertically cascaded metamaterial absorbers

Qin Chen, Fuhe Sun, and Shichao Song  »View Author Affiliations


Optics Express, Vol. 21, Issue 13, pp. 15896-15903 (2013)
http://dx.doi.org/10.1364/OE.21.015896


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Abstract

Metamaterial has demonstrated exotic electromagnetic (EM) properties and various applications, for example perfect absorbers. Cascaded perfect absorbers further extend the spectral engineering ability. Perfect alignment of subcells was usually presumed in previous studies. We numerically investigated the effect of lateral misalignments existing in the multiple lithography steps for vertically cascaded metamaterial absorbers and found that the position deviations of the subcells play an important role of the spectral response. As an example, near-unity absorbance reduces to only 30% for a λ/10 subcell misalignment. The detailed investigation of EM field and induced current distributions reveals that the relative position variations of strongly coupled subcells contribute to this phenomenon. The results give us an evaluation that how much registration accuracy is required in multi-step lithography for cascaded metamaterials and on the other side a hint of the potential application of this high position sensitivity.

© 2013 OSA

OCIS Codes
(160.3918) Materials : Metamaterials
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures
(040.6808) Detectors : Thermal (uncooled) IR detectors, arrays and imaging

ToC Category:
Metamaterials

History
Original Manuscript: May 6, 2013
Revised Manuscript: June 7, 2013
Manuscript Accepted: June 12, 2013
Published: June 25, 2013

Citation
Qin Chen, Fuhe Sun, and Shichao Song, "Subcell misalignment in vertically cascaded metamaterial absorbers," Opt. Express 21, 15896-15903 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-13-15896


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