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Local nanoheating and substrate nanomodification based on enhanced absorption and near-field properties of gold nanoparticles

N. N. NEDYALKOV1,2, S. E. IMAMOVA2, P. A. ATANASOV2, T. MIYANISHI1, M. OBARA1

Affiliation

  1. Department of Electronics and Electrical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
  2. Institute of Electronics, Bulgarian Academy of Sciences,72, Tsaridradsko shose Boul., Sofia 1784, Bulgaria

Abstract

In this paper a theoretical and experimental investigation on the local heating and near field properties of gold nanoparticles placed on a substrate is presented. The system under consideration consists of single gold nanoparticles with diameters of 80 and 200 nm deposited on substrate and irradiated by ultrashort laser pulse at wavelength of 800 nm. The heating of the nanoparticle is described by two-temperature heat model as the input optical properties of the nanoparticles are evaluated on the basis of Mie theory. The properties of the local field enhancement in the vicinity of nanoparticles are also discussed on the basis of Finite Difference Time Domain simulation results. The near field properties and the effect of nanoparticle heating predicted by the theory are confirmed by experiments on substrate modification mediated by gold nanoparticles. In the case of silicon substrate the produced nanoholes express clear dependence on the near field properties, while for dielectric substrate the particle heating is the main mechanism for substrate modification. The conducted research is directed toward the application of noble metal nanoparticles in photothermal therapeutic treatment of living cells at the optical transparency window (600-1300 nm) of the tissues..

Keywords

Gold nanoparticles, Plasmonics, Near field properties, Laser heating of nanoparticle.

Submitted at: June 18, 2009
Accepted at: Feb. 27, 2010

Citation

N. N. NEDYALKOV, S. E. IMAMOVA, P. A. ATANASOV, T. MIYANISHI, M. OBARA, Local nanoheating and substrate nanomodification based on enhanced absorption and near-field properties of gold nanoparticles, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 484-489 (2010)