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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 1 — Jan. 1, 2013
  • pp: 140–148

Dispersive full-wave finite-difference time-domain analysis of the bipolar cylindrical cloak based on the effective medium approach

Yong Yoon Lee and Doyeol Ahn  »View Author Affiliations


JOSA B, Vol. 30, Issue 1, pp. 140-148 (2013)
http://dx.doi.org/10.1364/JOSAB.30.000140


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Abstract

A dispersive full-wave finite-difference time-domain model is used to study the performance of bipolar cylindrical invisibility cloaking devices. We have considered two different cloaking structures generated by the mapping of the σ axis and the mapping of the τ axis of bipolar coordinates. The permittivity and permeability tensors for the cloaking devices are obtained from an effective medium approach in general relativity. The σ-axis mapped bipolar cylindrical cloak is found to be imperfect, and the cloaking performance is found to depend on the polarization of the incident waves, the direction of propagation of the waves, and the loss tangents of the metamaterial. Only the case of TM waves for the specific propagation direction shows good cloaking performance. On the other hand, the τ-mapped cloaking device shows good cloaking performance for all polarizations and directions of propagation. However, this structure has a singular boundary at the inner radius. Realistic cloaking materials with loss still show a cloak that is working, but attenuated backscattering waves exist.

© 2012 Optical Society of America

OCIS Codes
(000.2780) General : Gravity
(350.6980) Other areas of optics : Transforms
(160.3918) Materials : Metamaterials
(260.2710) Physical optics : Inhomogeneous optical media
(230.3205) Optical devices : Invisibility cloaks

ToC Category:
Materials

History
Original Manuscript: September 19, 2012
Revised Manuscript: October 22, 2012
Manuscript Accepted: November 1, 2012
Published: December 13, 2012

Citation
Yong Yoon Lee and Doyeol Ahn, "Dispersive full-wave finite-difference time-domain analysis of the bipolar cylindrical cloak based on the effective medium approach," J. Opt. Soc. Am. B 30, 140-148 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-1-140

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