摘要We study the plasmon-assisted transmission of two kinds of slit structures in a 290-nm-thick silver film on a glass substrate. For the two-slit structure, the total transmission intensity spectra displays a complex modulation, which is attributed to different propagation constants of the surface plasmon polaritons (SPPs) on the silver-air and silver-glass interfaces. Replacing one of the two slits by a shallow corrugation results in a simple sinusoidal intensity modulation because of the only effective SPP excitation and propagation on the silver-air interface. These confirm the role of different SPP propagations and interference in the transmission properties of metal nanoslits.
Abstract：We study the plasmon-assisted transmission of two kinds of slit structures in a 290-nm-thick silver film on a glass substrate. For the two-slit structure, the total transmission intensity spectra displays a complex modulation, which is attributed to different propagation constants of the surface plasmon polaritons (SPPs) on the silver-air and silver-glass interfaces. Replacing one of the two slits by a shallow corrugation results in a simple sinusoidal intensity modulation because of the only effective SPP excitation and propagation on the silver-air interface. These confirm the role of different SPP propagations and interference in the transmission properties of metal nanoslits.
LI Zhi;ZHANG Jia-Sen;YAN Hai-Feng;GONG Qi-Huang. Complex Modulation in Plasmon-Assisted Transmission Spectra of a Two-Slit Structure[J]. 中国物理快报, 2007, 24(11): 3233-3236.
LI Zhi, ZHANG Jia-Sen, YAN Hai-Feng, GONG Qi-Huang. Complex Modulation in Plasmon-Assisted Transmission Spectra of a Two-Slit Structure. Chin. Phys. Lett., 2007, 24(11): 3233-3236.
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