Browsing by Author "Zheng, Jun"

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Compact Transreflective Color Filters and Polarizers by Bilayer Metallic Nanowire Gratings on Flexible Substrates
(2013-05-01)
Ye, Zhi-Cheng
;
Zheng, Jun
;
Sun, Shu
;
Guo, Lin-Dong
;
Shieh, Han-Ping D.
An integrated transmitted polarizer and reflective color filters with structure of bilayer metallic nanowire grating on a flexible polyethylene terephthalate substrate was demonstrated by theory, experiment, and numerical simulation. Two kinds of waveguide resonances, which led to the comprehensive characters, were analyzed. The slits in the bilayer metallic grating permit the transmission of TM light (transverse magnetic field) in surface plasmon waveguide mode and prohibit the propagating of TE light (transverse electric field) with wavelengths larger than cutoff value to obtain polarization effect. The lateral guiding mode resonances on the interfaces of the metallic/substrate or metallic/air excite surface plasmon waves with certain wavelengths, which makes a single peak in the reflection spectrum of TM light and dips in transmission for color filtering effect of TM light. The experimental results and theoretical analyses are in good agreement. This new bilayer structure featured with nonabsorption, integrated functions and simple fabrication has a great potential in power saving and thickness reduction for display devices.
Highly anisotropic metasurface: a polarized beam splitter and hologram
(2014-09-29)
Zheng, Jun
;
Ye, Zhi-Cheng
;
Sun, Nan-Ling
;
Zhang, Rui
;
Sheng, Zheng-Ming
Two-dimensional metasurface structures have recently been proposed to reduce the challenges of fabrication of traditional plasmonic metamaterials. However, complex designs and sophisticated fabrication procedures are still required. Here, we present a unique one-dimensional (1-D) metasurface based on bilayered metallic nanowire gratings, which behaves as an ideal polarized beam splitter, producing strong negative reflection for transverse-magnetic (TM) light and efficient reflection for transverse-electric (TE) light. The large anisotropy resulting from this TE-metal-like/TM-dielectric-like feature can be explained by the dispersion curve based on the Bloch theory of periodic metal-insulator-metal waveguides. The results indicate that this photon manipulation mechanism is fundamentally different from those previously proposed for 2-D or 3-D metastructures. Based on this new material platform, a novel form of metasurface holography is proposed and demonstrated, in which an image can only be reconstructed by using a TM light beam. By reducing the metamaterial structures to 1-D, our metasurface beam splitter exhibits the qualities of cost-efficient fabrication, robust performance, and high tunability, in addition to its applicability over a wide range of working wavelengths and incident angles. This development paves a foundation for metasurface structure designs towards practical metamaterial applications.