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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 2 — Jan. 16, 2012
  • pp: 1552–1560

What makes single-helical metamaterials generate “pure” circularly polarized light?

Lin Wu, ZhenYu Yang, Ming Zhao, Peng Zhang, ZeQing Lu, Yang Yu, ShengXi Li, and XiuHua Yuan  »View Author Affiliations


Optics Express, Vol. 20, Issue 2, pp. 1552-1560 (2012)
http://dx.doi.org/10.1364/OE.20.001552


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Abstract

Circular polarizers with left-handed helical metamaterials can transmit right-handed circularly polarized (RCP) light with few losses. But a certain amount of left-handed circularly polarized (LCP) light will occur in the transmitted light, which is the noise of the circular polarizer. Therefore, we defined the ratio of the RCP light intensity to the LCP light intensity as the signal-to-noise (S/N) ratio. In our previous work, it’s found that circular polarizers with multi-helical metamaterials have two orders higher S/N ratios than that of single-helical metamaterials. However, it has been a great challenge to fabricate such multi-helical structures with micron or sub-micron feature sizes. Is it possible for the single-helical metamaterials to obtain equally high S/N ratios as the multi-helical ones? To answer this question, we systematically investigated the influences of structure parameters of single-helical metamaterials on the S/N ratios using the finite-different time-domain (FDTD) method. It was found that the single-helical metamaterials can also reach about 30dB S/N ratios, which are equal to the multi-helical ones. Furthermore, we explained the phenomenon by the antenna theory and optimized the performances of the single-helical circular polarizers.

© 2012 OSA

OCIS Codes
(260.5430) Physical optics : Polarization
(160.1585) Materials : Chiral media
(160.3918) Materials : Metamaterials

ToC Category:
Metamaterials

History
Original Manuscript: November 7, 2011
Revised Manuscript: December 13, 2011
Manuscript Accepted: December 31, 2011
Published: January 10, 2012

Citation
Lin Wu, ZhenYu Yang, Ming Zhao, Peng Zhang, ZeQing Lu, Yang Yu, ShengXi Li, and XiuHua Yuan, "What makes single-helical metamaterials generate “pure” circularly polarized light?," Opt. Express 20, 1552-1560 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-2-1552


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