A spectral element method calculation of extraordinary light transmission through periodic subwavelength slits
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A spectral element method together with a surface integral equation as the radiation boundary condition is used to simulate the scattering properties of periodic subwavelength slits. The surface integral equation utilizes the periodic Green's function in the wave number space and is solved by the method of moments, while the interior inhomogeneous medium is modeled by the spectral element method. The solution convergence is found to be exponential; i.e., the error decreases exponentially with the order of basis functions. To our knowledge, such a fast solver with spectral accuracy is new in the scattering problem of periodic structures. Scattering properties of a gold slit grid within the whole wavelength-incidence angle parameter space are investigated, with the confirmation that strong transmission of light through subwavelength slits is achievable. © 2010 Optical Society of America.
Published Version (Please cite this version)10.1364/JOSAB.27.000560
Publication InfoLuo, M; Liu, QH; & Guo, J (2010). A spectral element method calculation of extraordinary light transmission through periodic subwavelength slits. Journal of the Optical Society of America B: Optical Physics, 27(3). pp. 560-566. 10.1364/JOSAB.27.000560. Retrieved from https://hdl.handle.net/10161/4232.
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Professor of Electrical and Computer Engineering
Qing H. Liu received the Ph.D. degree in electrical engineering from the University of Illinois at Urbana-Champaign in 1989. His research interests have been in computational electromagnetics and acoustics, inverse problems, and their application in geophysics, nanophotonics, and biomedical imaging. He has published more than 300 refereed journal papers in these areas. He was a Research Assistant (September 1986 to December 1988) and then a Postdoctoral Research Associate (January 1989 to Feb