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Title: Nonperiodic metallic gratings transparent for broadband terahertz waves

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 91; Journal Issue: 4; Related Information: CHORUS Timestamp: 2017-06-22 23:31:08; Journal ID: ISSN 1098-0121
American Physical Society
Country of Publication:
United States

Citation Formats

Ren, Xiao-Ping, Fan, Ren-Hao, Peng, Ru-Wen, Huang, Xian-Rong, Xu, Di-Hu, Zhou, Yu, and Wang, Mu. Nonperiodic metallic gratings transparent for broadband terahertz waves. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.045111.
Ren, Xiao-Ping, Fan, Ren-Hao, Peng, Ru-Wen, Huang, Xian-Rong, Xu, Di-Hu, Zhou, Yu, & Wang, Mu. Nonperiodic metallic gratings transparent for broadband terahertz waves. United States. doi:10.1103/PhysRevB.91.045111.
Ren, Xiao-Ping, Fan, Ren-Hao, Peng, Ru-Wen, Huang, Xian-Rong, Xu, Di-Hu, Zhou, Yu, and Wang, Mu. 2015. "Nonperiodic metallic gratings transparent for broadband terahertz waves". United States. doi:10.1103/PhysRevB.91.045111.
title = {Nonperiodic metallic gratings transparent for broadband terahertz waves},
author = {Ren, Xiao-Ping and Fan, Ren-Hao and Peng, Ru-Wen and Huang, Xian-Rong and Xu, Di-Hu and Zhou, Yu and Wang, Mu},
abstractNote = {},
doi = {10.1103/PhysRevB.91.045111},
journal = {Physical Review B},
number = 4,
volume = 91,
place = {United States},
year = 2015,
month = 1

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevB.91.045111

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Cited by: 8works
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  • In this work, we demonstrate both theoretically and experimentally that nonperiodic metallic gratings can become transparent for broadband terahertz waves. It is shown that broadband high transmission appears in aperiodic metallic gratings (including quasiperiodic and disordered ones), which originates from the nonresonant excitations in the grating system. Quasiperiodic and disordered metallic gratings effectively weaken and even eliminate Wood's anomalies, which are the diffraction-related characters of periodic gratings. Consequently, both the transparence bandwidth and transmission efficiency are significantly increased due to the structural aperiodicity. An optimal condition is also achieved for broadband high transparency in aperiodicmetallic gratings. Experimental measurements at themore » terahertz regime reasonably agree with both analytical analysis and numerical simulations. Furthermore, we show that for a specific light source, for example, a line source, a corresponding nonperiodic transparent grating can be also designed. We expect that our findings can be applied for transparent conducting panels, perfect white-beam polarizers, antireflective conducting solar cells, and beyond.« less
  • The authors investigate light absorption in organic solar cells in which indium tin oxide (ITO) is replaced by a new metallic architecture (grating) as a transparent electrode. Different from typical metal nanowire gratings, our gratings consist of metal nanowalls with nanoscale footprint and (sub)microscale height [Adv. Mater. 23, 2469 (2011)], thus ensuring high optical transmittance and electrical conductivity. Simulations reveal that a broadband and polarization-insensitive light absorption enhancement is achieved via two mechanisms, when such silver nanowall gratings are employed in P3HT:PCBM based solar cells. Overall absorption enhanced by ~23% compared to a reference cell with ITO electrode.
  • The incorporation of plasmonic nanostructures in the thin-film solar cells (TFSCs) is a promising route to harvest light into the nanoscale active layer. However, the light trapping scheme based on the plasmonic effects intrinsically presents narrow-band resonant enhancement of light absorption. Here we demonstrate that by cascading metal nanogratings with different sizes atop the TFSCs, broadband absorption enhancement can be realized by simultaneously exciting multiple localized surface plasmon resonances and inducing strong coupling between the plasmonic modes and photonic modes. As a proof of concept, we demonstrate of 66.5% in the photocurrent in an ultrathin amorphous silicon TFSC with two-dimensionalmore » cascaded gratings over the reference cell without gratings.« less
  • Transparent conducting electrodes, which are not made from indium tin oxide, and which display a strong angular dependence are useful for various technologies. Here, we introduce a tilted silver grating that combines a large conductance with a strong and angle-specific transmittance. When the light incidence angle matches the tilt angle of the grating, transmittance is close to the maximum along a very broadband range. We explain the behavior through simulations that show in detail the plasmonic and interference effects at play.
  • In this letter, we have demonstrated that serrated metal gratings, which introduce gradient coatings, can give rise to broadband transmission enhancement of acoustic waves. Here, we have experimentally and theoretically studied the acoustic transmission properties of metal gratings with or without serrated boundaries. The average transmission is obviously enhanced for serrated metal gratings within a wide frequency range, while the Fabry-Perot resonance is significantly suppressed. An effective medium hypothesis with varying acoustic impedance is proposed to analyze the mechanism, which was verified through comparison with finite-element simulation. The serrated boundary supplies gradient mass distribution and gradient normal acoustic impedance, whichmore » could efficiently reduce the boundary reflection. Further, by increasing the region of the serrated boundary, we present a broadband high-transmission grating for wide range of incident angle. Our results may have potential applications to broadband acoustic imaging, acoustic sensing, and acoustic devices.« less