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Plasmonic Optical Nonlinearities of Copper Sulfide Nanoparticles

Published online by Cambridge University Press:  22 January 2018

Yasushi Hamanaka ,
Tatsunori Hirose ,
Kaoru Yamada ,
Kazuki Miyagawa  and
Toshihiro Kuzuya
Yasushi Hamanaka*
Affiliation:
Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi466-8555, Japan.
Tatsunori Hirose
Affiliation:
Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi466-8555, Japan.
Kaoru Yamada
Affiliation:
Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi466-8555, Japan.
Kazuki Miyagawa
Affiliation:
Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi466-8555, Japan.
Toshihiro Kuzuya
Affiliation:
Muroran Institute of Technology, Mizumoto-cho, Muroran, Hokkaido050-8585, Japan.
*
*(Email: [email protected])
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Abstract

Spherical Cu2-xS nanoparticles with an average diameter of 4.6 nm were synthesized by a colloidal method, and their optical nonlinearities around localized surface plasmon resonance in the near-infrared region were investigated. Resonant enhancement of nonlinear absorption, which is similar to that in the case of the noble metal nanoparticles in the visible region, was observed. The nonlinear absorption coefficients of the Cu2-xS nanoparticles were smaller as compared with those of Au nanoparticles with the same dimensions and concentrations. Theoretical simulation of electric field distributions around individual nanoparticles suggested that the free carrier concentration in Cu2-xS nanoparticles was one order of magnitude smaller than that in Au nanoparticles, which led to a weaker local electric field and weaker optical nonlinearity.

Keywords

nanostructureoptical propertiessemiconducting
Type
Articles
Information
MRS Advances , Volume 3 , Issue 14: Nanomaterials , 2018 , pp. 741 - 746
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Copyright
Copyright © Materials Research Society 2018 

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References

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