Tunable surface-plasmon-resonance wavelength of silver island films

doi:10.1088/1674-1056/19/11/117310

Abstract This paper experimentally and theoretically investigates the effect of the underlayer medium on tuning of the surface plasmon resonance (SPR) wavelength of silver island films, and the effect of substrate temperature on the morphologies and optical properties of the films. From the absorption spectra of single Ag with various thickness and overcoated (Ag/TiO₂) films deposited on glass substrates at various substrate temperatures by RF magnetron sputtering, we demonstrate that the surface plasmon resonance wavelength can be made tunable by changing the underlayer medium, the thickness of metal layer and the substrate temperature. By varying substrate temperatures, the interparticle coupling effects on plasmon resonances of nanosilver particles enhance as the spacing between the particles reduces. When the substrate temperature is up to 500 ℃, the absorption peak decreases sharply and shifts to shorter wavelength side due to the severe coalescence between silver islands in the film.

Keywords: Ag/TiO₂ island thin film surface plasmons absorption spectrum substrate temperature

Received: 16 May 2010
Revised: 23 June 2010
Accepted manuscript online:

PACS:	68.55.-a	(Thin film structure and morphology)
	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	78.66.Bz	(Metals and metallic alloys)
	81.15.Cd	(Deposition by sputtering)

Fund: Project supported by the Distinguished Youth Foundation of Hunan Province, China (Grant No. 03JJY1008), the Science Foundation for Post-doctorate of China, (Grant No. 2004035083), and the Natural Science Foundation of Hunan Province, China (Grant No. 06JJ2034).

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Wang Ji-Fei(王继飞), Li Hong-Jian(李宏建), Zhou Zi-You(周子游), Li Xue-Yong(李雪勇), Liu Ju(刘菊), and Yang Hai-Yan(杨海艳) Tunable surface-plasmon-resonance wavelength of silver island films 2010 Chin. Phys. B 19 117310

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Tunable surface-plasmon-resonance wavelength of silver island films

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