Broadband High-Efficiency Half-Wave Plate: A Supercell-Based Plasmonic Metasurface Approach
2015 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 9, no 4, 4111-4119 p.Article in journal (Refereed) Published
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.
metasurface, half-wave plate, plasmonic antennas, background-free
IdentifiersURN: urn:nbn:se:kth:diva-169153DOI: 10.1021/acsnano.5b00218ISI: 000353867000076PubMedID: 25790895ScopusID: 2-s2.0-84928978897OAI: oai:DiVA.org:kth-169153DiVA: diva2:820398
FunderSwedish Research Council, 621-2011-4620
QC 201506122015-06-122015-06-112015-06-12Bibliographically approved