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Broadband High-Efficiency Half-Wave Plate: A Supercell-Based Plasmonic Metasurface Approach
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Zhejiang University, China.
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2015 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 9, no 4, 4111-4119 p.Article in journal (Refereed) Published
Abstract [en]

We design, fabricate, and experimentally demonstrate an ultrathin, broadband half-wave plate in the near-infrared range using a plasmonic metasurface. The simulated results show that the linear polarization conversion efficiency is over 97% with over 90% reflectance across an 800 nm bandwidth. Moreover, simulated and experimental results indicate that such broadband and high-efficiency performance is also sustained over a wide range of incident angles. To further obtain a background-free half-wave plate, we arrange such a plate as a periodic array of integrated supercells made of several plasmonic antennas with high linear polarization conversion efficiency, consequently achieving a reflection-phase gradient for the cross-polarized beam. In this design, the anomalous (cross-polarized) and the normal (copolarized) reflected beams become spatially separated, hence enabling highly efficient and robust, background-free polarization conversion along with broadband operation. Our results provide strategies for creating compact, integrated, and high-performance plasmonic circuits and devices.

Place, publisher, year, edition, pages
2015. Vol. 9, no 4, 4111-4119 p.
Keyword [en]
metasurface, half-wave plate, plasmonic antennas, background-free
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-169153DOI: 10.1021/acsnano.5b00218ISI: 000353867000076PubMedID: 25790895Scopus ID: 2-s2.0-84928978897OAI: oai:DiVA.org:kth-169153DiVA: diva2:820398
Funder
Swedish Research Council, 621-2011-4620
Note

QC 20150612

Available from: 2015-06-12 Created: 2015-06-11 Last updated: 2017-12-04Bibliographically approved

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CiteExportLink to record
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