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Enhanced photoabsorption efficiency of incomplete nanoshells

Venkatapathi, Murugesan and Dastidar, Sudipta G and Bharath, P and Roy, Arindam and Ghosh, Anupam (2013) Enhanced photoabsorption efficiency of incomplete nanoshells. In: Optics Letters, 38 (17). pp. 3275-3278.

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Official URL: http://dx.doi.org/ 10.1364/OL.38.003275


The rather low scattering or extinction efficiency of small nanoparticles, metallic and otherwise, is significantly enhanced when they are adsorbed on a larger core particle. But the photoabsorption by particles with varying surface area fractions on a larger core particle is found to be limited by saturation. It is found that the core-shell particle can have a lower absorption efficiency than a dielectric core with its surface partially nucleated with absorbing particles-an ``incomplete nanoshell'' particle. We have both numerically and experimentally studied the optical efficiencies of titania (TiO2) nucleated in various degrees on silica (SiO2) nanospheres. We show that optimal surface nucleation over cores of appropriate sizes and optical properties will have a direct impact on the applications exploiting the absorption and scattering properties of such composite particles.

Item Type: Journal Article
Publication: Optics Letters
Publisher: Optical Society of America
Additional Information: Copyright of this article belongs to Optical Society of America.
Department/Centre: Division of Interdisciplinary Sciences > Supercomputer Education & Research Centre
Date Deposited: 25 Sep 2013 11:26
Last Modified: 25 Sep 2013 11:26
URI: http://eprints.iisc.ac.in/id/eprint/47428

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