Multi-channel frequency and spatial filter composed of Ag-air nanofilm
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1.
School of Science, Jiangsu University, Zhenjiang 212013, China;
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2.
Department of Physics, Zhenjiang Watercraft College, Zhenjiang 212003, China
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Received Date:
2010-01-21
Accepted Date:
2010-01-28
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Abstract
The optical transmission property of Ag-air nanofilm was studied based on Bloch's theorem and the transfer matrix method.At a given incident angle,there are some discrete frequency channels;at a given frequency,there are also some discrete spatial channels.Through changing the thickness of air,the positions of frequency channels and spatial channels can be easily adjusted.The loss of Ag influences the transmittance but does not change the position of filtering channel.Through decreasing the thickness of Ag layer,the loss cannot influence the filtering function of the Ag-air structure.The results indicate that the Ag-air structure can be used as a multi-channel frequency filter and spatial filter.
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