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Proceedings Paper

Surface plasmon mediated inverse polarization transmission through metallic gratings in deep ultraviolet band
Author(s): Guoguo Kang; Quan Chi; Xiaodi Tan
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Paper Abstract

Using conventional wire grid polarizers to manipulate the polarization of deep ultraviolet (DUV) light is generally known as difficult because of the limits of the current nano-fabrication technologies. To ease the fabrication, two metallic gratings, Al-air and Al-SiO2 gratings, with periods slightly smaller than the DUV wavelength, were designed to exhibit an inverse polarizing effect, i. e. with TE transmittance largely exceeding TM transmittance. Both gratings were experimentally verified to possess inverse polarization transmission, whereas an enhanced TE transmission through Al- SiO2 grating was observed. By using the Fourier modal method and the planar waveguide theory, we show that the strong coupling of the incident DUV wave to surface plasmons results in the minimum in TM transmittance, whereas the coupling to low-loss TE mode leads to the TE transmission through the grating region. By conformally filling the grating slits with the substrate dielectrics-SiO2, the effective refractive index of the TE guided mode approaching that of the substrate greatly reduces the reflection of the mode at the grating-substrate interface. Thus, the TE transmittance of Al- SiO2 grating is largely enhanced compared with Al-air case. At the DUV lithographic wavelength-193 nm, the measured inverse polarization extinction ratio of Al-SiO2 grating is 103, suggesting itself a qualified compact polarizer for ArF 193 nm lithography system.

Paper Details

Date Published: 10 September 2014
PDF: 8 pages
Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91630Q (10 September 2014); doi: 10.1117/12.2060512
Show Author Affiliations
Guoguo Kang, Beijing Institute of Technology (China)
Quan Chi, Beijing Institute of Technology (China)
Xiaodi Tan, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 9163:
Plasmonics: Metallic Nanostructures and Their Optical Properties XII
Allan D. Boardman, Editor(s)

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