Plasmonic, Low-Frequency Raman, and Nonlinear Optical-Limiting Studies in Copper鈥揝ilica Nanocomposites
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- 作者：Satyabrata Mohapatra (1) smiuac@gmail.com
Y. K. Mishra (2)
A. M. Warrier (3)
Reji Philip (3)
S. Sahoo (4)
A. K. Arora (4)
D. K. Avasthi (5) - 关键词：Plasmonic nanocomposites – ; Nonlinear absorption – ; Optical limiting – ; Surface plasmon resonance
- 刊名：Plasmonics
- 出版时间：March 2012
- 出版年：2012
- 期刊代码：pc373_1557-1955
- 类别：ch
- 卷：7
- 期：1
- 页码：25-31
- 数据来源：sp
摘要
Nanocomposite thin films consisting of Cu nanoparticles embedded in silica matrix were synthesized by atom beam co-sputtering technique. Plasmonic, optical, and structural properties of the nanocomposite films were investigated by using ultraviolet (UV)–visible absorption spectroscopy, nonlinear optical transmission, X-ray diffraction (XRD), and low-frequency Raman scattering. UV–visible absorption studies revealed the surface plasmon resonance absorption at 564 nm which showed a red shift with increase in Cu fraction. XRD results together with surface plasmon resonance absorption confirmed the presence of Cu nanoparticles of different size. Low-frequency Raman studies of nanocomposite films revealed breathing modes in Cu nanoparticles. Nanocomposites with lower metal fractions were found to behave like optical limiters. The possibility of controllably tuning the optical nonlinearity of these nanocomposites could enable them to be the potential candidates for applications in nanophotonics.