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Tailoring LSPR-Based Absorption and Scattering Efficiencies of Semiconductor-Coated Au nanoshells

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Abstract

Absorption and scattering efficiencies of semiconductor-coated Au nanoshell have been studied by the extended Mie theory for their possible solar cell, optical imaging, and photothermal applications, etc. The effect of Au shell layer thickness, core size, and surrounding medium on the absorption and scattering efficiencies at the localized surface plasmon resonance (LSPR) wavelengths has been reported. It has been found that both the absorption and scattering efficiencies get blue-shifted with an increase in Au shell layer thickness from 2 to 10 nm and with an increase in surrounding refractive index whereas the corresponding LSPR peaks shift towards red. It has also been found that the spectra are red-shifted with an increase in the core radius from 20 to 40 nm while keeping the shell thickness same. The effect of shell thickness on the absorption peak position and absorption linewidth has also been studied. Hence, the optical response of both CdSe- and CdTe-coated Au nanoshells can be tuned and controlled from the visible to the near-infrared (NIR) region of the electromagnetic (EM) spectrum. Finally, the CdSe-coated Au nanoshell exhibits high scattering and absorption efficiencies in comparison to the CdTe-coated nanoshell.

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Acknowledgments

The author, Amit Bansal, would like to thank SLIET Longowal for the financial support in the form of institute fellowship towards his Ph.D.

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Authors and Affiliations

  1. Department of Physics, Sant Longowal Institute of Engineering & Technology, Longowal-148106, District Sangrur, Punjab, India

    Amit Bansal & S. S. Verma

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  1. Amit Bansal
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  2. S. S. Verma
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Correspondence to Amit Bansal.

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Bansal, A., Verma, S.S. Tailoring LSPR-Based Absorption and Scattering Efficiencies of Semiconductor-Coated Au nanoshells. Plasmonics 9, 335–341 (2014). https://doi.org/10.1007/s11468-013-9629-4

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  • DOI: https://doi.org/10.1007/s11468-013-9629-4

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