Excitation of Surface Plasmons on a Metal Grating and Its Application to an Index Sensor
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- OKUNO Yoichi
- Graduate School of Science and Technology, Kumamoto University
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- SUYAMA Taikei
- Graduate School of Science and Technology, Kumamoto University
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- HU Rui
- Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University
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- HE Sailing
- Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University
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- MATSUDA Toyonori
- Division of Electromagnetic Theory, Royal Institute of Technology
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Abstract
Excitation of plasmons on the surface of a metal grating placed in planar or conical mounting is investigated in detail. Most of the results of numerical computations are compared with experimental data. When a TM wave illuminates a metal grating, total or partial absorption of incident light occurs at angles of incidence at which the plasmon surface waves are excited. In planar mounting the absorption is generally strong and nearly total absorption is observed. While in conical mounting, it is not so strong as that in the planar mounting case and a considerable amount of incident power is reflected. This, however, is accompanied by enhanced TM-TE mode conversion and the greater part of the reflected wave is in the TE polarization. The reciprocal of the TM-wave efficiency, hence, is a practical measure in finding the angles of incidence at which the plasmons are excited. Because the angles are sensitive functions of the refractive index of a material over the grating surface, this phenomenon can be used as an index sensor.
Journal
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- IEICE transactions on electronics
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IEICE transactions on electronics 90 (7), 1507-1514, 2007-07-01
The Institute of Electronics, Information and Communication Engineers
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Details 詳細情報について
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- CRID
- 1572824502428169344
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- NII Article ID
- 110007538904
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- NII Book ID
- AA10826283
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- ISSN
- 09168524
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- Text Lang
- en
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- Data Source
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- CiNii Articles