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Metal-nanowall grating transparent electrodes: Achieving high optical transmittance at high incident angles with minimal diffraction
Optics Express
  • Ping Kuang, Iowa State University
  • Joong Mok Park, Iowa State University
  • Geyuan Liu, Iowa State University
  • Zhuo Ye, Iowa State University
  • Wai Y. Leung, Iowa State University
  • Sumit Chaudhary, Iowa State University
  • David W. Lynch, Iowa State University
  • Kai-Ming Ho, Iowa State University
  • Kristen P. Constant, Iowa State University
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A novel architecture has been employed to fabricate transparent electrodes with high conductivity and high optical transmittance at high incident angles. Soft lithography is used to fabricate polymer grating patterns onto which thin metallic films are deposited. Etching removes excess metal leaving tall walls of metal. Polymer encapsulation of the structure both protects the metal and minimizes diffraction. Transmission is dependent upon the height of the walls and encapsulation and varies from 60% to 80% for structures with heights of 1400 nm to 300 nm. In encapsulated structures, very little distortion is visible (either parallel to or perpendicular to standing walls) even at viewing angles 60° from the normal. Diffraction is at characterized through measurement of intensity for zeroth through third order diffraction spots. Encapsulation is shown to significantly reduce diffraction. Measurements are supported by optical simulations.

This article is from Optics Express 21 (2013): 2393–2401, doi:10.1364/OE.21.002393. Posted with permission.

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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Optical Society of America
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Ping Kuang, Joong Mok Park, Geyuan Liu, Zhuo Ye, et al.. "Metal-nanowall grating transparent electrodes: Achieving high optical transmittance at high incident angles with minimal diffraction" Optics Express Vol. 21 Iss. 2 (2013) p. 2393 - 2401
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