Surface plasmon resonance tuning in gold film on silver nanospheres through optical absorption

Sensing and Bio-Sensing Research

Zhengwang Li¹  Weiyuan Sun²  Hongyu Wang³  Jialin Ji³ 

[1] Corresponding author.;Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 Jun Gong Road, Shanghai 200093, People's Republic of China;Tongda college of Nanjing University of Post and Telecommunications, No. 33 South of Runyang Road, Yangzhou 225127, People's Republic of China;

关键词: Surface plasmon resonance (SPR);    Blue shift;    Thermal annealing;    Silver nanospheres;    Surface-enhanced Raman scattering (SERS);   

DOI  :  

来源: DOAJ

【 摘 要 】

The surface plasmon resonance wavelength in a gold film above silver nanospheres on a silica substrate was measured using transmission absorption spectroscopy. The structure, surface morphology, and optical properties of the gold/silver nanosphere thin films were investigated using X-ray diffraction (XRD), atomic force microscopy (AFM), UV-VIS-NIR double beam spectrometry, and Raman spectroscopy, respectively. The silver nanospheres were fabricated by simple thermal annealing. A gold film with thickness ranging from 2 to 50 nm on top of the silver nanospheres exhibits a blue-shift in the resonance wavelength from 590 to 510 nm. Surface-enhanced Raman scattering (SERS) is also reported in this paper. Additionally, finite-difference time-domain (FDTD) simulations were used to describe surface plasmon resonance in the samples, and the numerical results were consistent with experimental results.

【 授权许可】

Unknown