The Study of anomalous Infrared Transmittance of Metallic Gratings with Various Thickness
Date Issued
2007
Date
2007
Author(s)
Wu, Meng-Ju
DOI
zh-TW
Abstract
The optical properties of periodical structure have been studied for a long time. The reason to anomaly of transmission spectrum was not well-discovered. For polarized incident light, the electromagnetic wave excited around one-dimensional metallic grating is more complicated than two-dimensional structure.
In the thesis, we took usage of e-beam lithography system and two kinds of photoresist to define the pattern of grating. The undercut structure was fabricated with wet etching and the metallic grating was deposited with evaporation. The incident light was polarized in TE and TM modes, and the transmission spectrum of sample was measured by Fourier transform infrared spectrometer. We analyzed rising and descending trends of wave in the spectrum and tried to explain the underlying physics of extraordinary transmission points.
Subjects
光柵
厚度
表面電漿
橫電
橫磁
LOR
TE
TM
Surface plasmons
thickness
Type
thesis
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