Effects of particle size and surrounding media on optical radiation efficiencies of spherical plasmonic metal nanoparticles

Bulletin of materials science

Katsuaki Tanabe²  Rishi B Sharma¹  Vinayak A Dhumale¹  Preeti V Shah³ 

[1] Department of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, India$$Department of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, IndiaDepartment of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, India$$;Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan$$Institute for Nano Quantum Information Electronics, University of Tokyo, Tokyo 153-8505, Japan$$Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, JapanInstitute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan$$Institute for Nano Quantum Information Electronics, University of Tokyo, Tokyo 153-8505, Japan$$Institute for Nano Quantum Information Electronics, University of Tokyo, Tokyo 153-8505, JapanInstitute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan$$Institute for Nano Quantum Information Electronics, University of Tokyo, Tokyo 153-8505, Japan$$;Department of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, India$$Solid State Physics Laboratory, Delhi 110 054, India$$Department of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, IndiaDepartment of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, India$$Solid State Physics Laboratory, Delhi 110 054, India$$Solid State Physics Laboratory, Delhi 110 054, IndiaDepartment of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411 025, India$$Solid State Physics Laboratory, Delhi 110 054, India$$

关键词: Metal nanoparticles;    optical radiation efficiency;    surface plasmon resonance;    scattering and absorption cross-section.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The optical radiation efficiency (�?), the ratio of scattering cross-section to extinction cross-section, of spherical metal nanoparticles (M= Al, Ag, Au and Cu) surrounded by glass and water was calculated using classical electrostatics. The effect of varying particle diameter (∼100 nm) on �? was also studied for free space wavelengths in the range of 400�??1200 nm. The variations in the value of �? with the diameter (�??) of the metal nanoparticles were calculated on the basis of quasi-static approximation. The �? increases with the size of metal nanoparticles. Corresponding to a metal nanoparticle, �? was found to exhibit a sharp dip (�?_dip) at a characteristic wavelength (�?_�?)_M in a particular medium (�? = air, glass and water). (�?_�?)_M was independent of particle size. The (�?_medium)_M was found to be slightly blue shifted for all metal nanoparticles surrounded by glass or water with respect to those in the air.

【 授权许可】

Unknown