Study of surface plasmon resonance of Au nanoparticles coated with dielectric layers

Jia-Yu He; Chan-yan Huang; Ning Dai; Da-ming Zhu

doi:10.1117/12.899870

8 September 2011 Study of surface plasmon resonance of Au nanoparticles coated with dielectric layers

Jia-Yu He, Chan-yan Huang, Ning Dai, Da-ming Zhu

Proceedings Volume 8191, International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies; 81910N (2011) https://doi.org/10.1117/12.899870
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

In this work, atomic layer deposition (ALD) was used to deposit different thickness layers of Al₂O₃ on Au nanoparticles fabricated by thermal annealing of Au thin films. The effects of the Au-coated Al₂O₃ layer thickness variation to local surface plasmon resonance (LSPR) in gold (Au) nanoparticles was investigated using transmission surface plasmon resonance (T-SPR) spectroscopy. Thermal annealing of ultrathin films of Au sputtered on transparent substrates can get a dispersed metal particles system which exhibit transmission spectra showing an extinction band attributed to localized surface plasmon resonance (LSPR). The particles prepared by thermal annealing are much more like elliptical rather than sphere. The dielectric medium layer Al₂O₃ was deposited on these Au particles with the thickness from few nanometers to tens of nanometers by ALD. We found that All the LSPR peak positions of particles on different substrates red shifted as the thickness of deposition layer increase, but the LSPR red-shift effect of particles on alumina substrate was much more remarkable than particles on glass substrate. The results in this paper show that it is a very continent method to manipulate LSPR position which is a profound useful effect in solar cell application by controlling the deposition layer thickness on particles prepared by thermal annealing on suitable substrate.

Citation Download Citation

Jia-Yu He, Chan-yan Huang, Ning Dai, and Da-ming Zhu "Study of surface plasmon resonance of Au nanoparticles coated with dielectric layers", Proc. SPIE 8191, International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies, 81910N (8 September 2011); https://doi.org/10.1117/12.899870

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