Optical properties of monodisperse gold nanoshells on silica cores

Vitaly Khanadeev; Boris Khlebtsov; Nikolai Khlebtsov

doi:10.1117/12.2229733

21 April 2016 Optical properties of monodisperse gold nanoshells on silica cores

Vitaly Khanadeev, Boris Khlebtsov, Nikolai Khlebtsov

Proceedings Volume 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS); 991719 (2016) https://doi.org/10.1117/12.2229733
Event: Saratov Fall Meeting 2015, 2015, Saratov, Russian Federation

Abstract

Gold nanoshells are promising nanoparticles for biomedical applications such as biosensing, photothermal therapy, and surface enhanced Raman scattering. However, existing synthesis protocols produce polydisperse samples with extinction plasmonic spectrum much broader than that predicted by electromagnetic Mie simulations. Here we report on improved synthesis of gold nanoshells using monodisperse silica cores with very narrow size distributions of separated samples. As a result we were able to fabricate high quality silica/gold nanoshells with very narrow plasmon resonance peak, which is in good agreement with Mie calculations based on polydisperse TEM models. TEM images revealed a presence of dimers and trimers in as-prepared nonseparated samples. We performed extensive finite difference time-domain (FDTD) simulations to show that the plasmonic response of aggregated nanoshells results in enhanced extinction across NIR spectral band and in a minor broadening of the main plasmonic peak. To summarize, the improved synthetic technology produces high quality monodisperse silica/gold nanoshells which optical properties are in excellent agreement with electromagnetic simulations based on TEM size distributions.

Citation Download Citation

Vitaly Khanadeev, Boris Khlebtsov, and Nikolai Khlebtsov "Optical properties of monodisperse gold nanoshells on silica cores", Proc. SPIE 9917, Saratov Fall Meeting 2015: Third International Symposium on Optics and Biophotonics and Seventh Finnish-Russian Photonics and Laser Symposium (PALS), 991719 (21 April 2016); https://doi.org/10.1117/12.2229733

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