Optical Plasmon Resonances in Arrays of Au Nanoclusters
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This work is devoted to the study of the phenomenon of localized surface plasmon resonance (LSPR) in Au nanocluster arrays using optical reflection spectroscopy. Arrays of nanoclusters having the shape of a cylinder, the diameter and period of which vary in the range of 30–150 and 130–200 nm, respectively, were manufactured on Si and Si / SiO2 substrates by electron beam lithography. From a comparison of experimental reflection spectra with numerically calculated by finite difference time domain method (FDTD), the structural parameters of the model of plasmon nanostructures, used later for the calculation of absorption spectra of plasmon structures, were determined. The LSPR frequencies were determined by the maximum of the absorption spectra. This study revealed a strong dependence of the LSPR frequency position on the size of nanoclusters, the distance between nanoclusters, and the thickness of the SiO2 layer in the nanometer range. Particular attention was paid to the observation of the reflection spectra of the formation of a transverse plasmon mode propagating along the surface of the substrate and polarized perpendicular to the surface. We associate the excitation of this mode with the scattering of the electromagnetic field on neighboring nanoclusters. The proposed method provides the possibility of rapid determination of the frequency position of the LSPR in the optical reflection spectra, which is especially important in the case of opaque substrates (including Si and Si / SiO2 substrates), for which the measurement of optical absorption is impossible. A wide range of potential applications for metallic nanostructures with well-controlled plasmon properties includes surface-enhanced infrared absorption, photoluminescence, and Raman scattering, as well as signal transmission in silicon Photonics.
Keywords
localized surface plasmon resonance, Au nanoclusters, optical reflection spectroscopy, optical absorption
Acknowledgements
The study was carried out with the financial support of the Russian Foundation for Basic Research and the German Scientific and Research Association within the framework of RFBR projects (projects no. 18-02-00615_a, 19-52- 12041 NNIO_a). We thank A. Oreshonkov and A. Shakhramanyan for help in numerical modeling. S. L. Veber acknowledges RSF (grant no. 17-13-01412) for support of FT-IR meauserements.
УДК 538.958
Optical Plasmon Resonances in Arrays of Au Nanoclusters
0000-0003-4940-7074 The material was received by the Editorial Board: 08.02.2019
Abstract This work is devoted to the study of the phenomenon of localized surface plasmon resonance (LSPR) in Au nanocluster arrays using optical reflection spectroscopy. Arrays of nanoclusters having the shape of a cylinder, the diameter and period of which vary in the range of 30–150 and 130–200 nm, respectively, were manufactured on Si and Si / SiO2 substrates by electron beam lithography. From a comparison of experimental reflection spectra with numerically calculated by finite difference time domain method (FDTD), the structural parameters of the model of plasmon nanostructures, used later for the calculation of absorption spectra of plasmon structures, were determined. The LSPR frequencies were determined by the maximum of the absorption spectra. This study revealed a strong dependence of the LSPR frequency position on the size of nanoclusters, the distance between nanoclusters, and the thickness of the SiO2 layer in the nanometer range. Particular attention was paid to the observation of the reflection spectra of the formation of a transverse plasmon mode propagating along the surface of the substrate and polarized perpendicular to the surface. We associate the excitation of this mode with the scattering of the electromagnetic field on neighboring nanoclusters. The proposed method provides the possibility of rapid determination of the frequency position of the LSPR in the optical reflection spectra, which is especially important in the case of opaque substrates (including Si and Si / SiO2 substrates), for which the measurement of optical absorption is impossible. A wide range of potential applications for metallic nanostructures with well-controlled plasmon properties includes surface-enhanced infrared absorption, photoluminescence, and Raman scattering, as well as signal transmission in silicon Photonics.
Keywords
localized surface plasmon resonance, Au nanoclusters, optical reflection spectroscopy, optical absorption
Acknowledgements
The study was carried out with the financial support of the Russian Foundation for Basic Research and the German Scientific and Research Association within the framework of RFBR projects (projects no. 18-02-00615_a, 19-52- 12041 NNIO_a). We thank A. Oreshonkov and A. Shakhramanyan for help in numerical modeling. S. L. Veber acknowledges RSF (grant no. 17-13-01412) for support of FT-IR meauserements.
УДК 538.958
Optical Plasmon Resonances in Arrays of Au Nanoclusters References: Anikin К. V., Milekhin А. G., Rodyakina Е. Е., Veber S. L., Latyshev А. V., Zahn D. R. T. Optical Plasmon Resonances in Arrays of Au Nanoclusters. Siberian Journal of Physics . 2019, vol. 14, no. 1. P. 63–76. (in Russ.). DOI: 10.25205/2541-9447-2019-14-1-63-76