Demonstration of surface plasmons in metal island films and the effect of the surrounding medium - An undergraduate experiment

被引:26
作者
Orfanides, P [1 ]
Buckner, TF
Buncick, MC
Meriaudeau, F
Ferrell, TL
机构
[1] Memphis State Univ, Dept Phys, Memphis, TN 38152 USA
[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
关键词
D O I
10.1119/1.1285859
中图分类号
G40 [教育学];
学科分类号
040101 ; 120403 ;
摘要
We present a demonstration of the surface plasmon phenomenon as it occurs in thin metal island films. The metal films are deposited on glass microscope slides. The effect of the surface plasmon resonance may be observed visually on the slide without further apparatus. Heating the film changes the shape of the islands and therefore the resonant frequency of the surface plasmon and changes the color of the film. Placing the film in a dielectric medium changes the resonance condition for the surface plasmon again and changes the color again. We show this by coating the slides with commercially available liquids with different indices of refraction. We present a theoretical model that assumes the islands are oblate spheroids. There are enough details given so that the equations can be programed and the theoretical optical absorbance can be reproduced. We also present a modification to the theory so that the shift in resonant frequency can be calculated when the spheroids are immersed in the index fluids. We describe our apparatus for making thin films and our optical spectrometer system. We then present optical absorbance measurements of thin films of both Ag and Au in air and in two liquids with different indices of refraction. (C) 2000 American Association of Physics Teachers.
引用
收藏
页码:936 / 942
页数:7
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