Metallic nanoparticles in a standing wave: Optical force and heating

0397694 - ÚPT 2014 RIV GB eng J - Journal Article
Šiler, Martin - Chvátal, Lukáš - Zemánek, Pavel
Metallic nanoparticles in a standing wave: Optical force and heating.
Journal of Quantitative Spectroscopy and Radiative Transfer. Roč. 126, September (2013), s. 84-90. ISSN 0022-4073. E-ISSN 1879-1352
R&D Projects: GA ČR GPP205/12/P868; GA MŠMT LH12018; GA MŠMT ED0017/01/01
Institutional support: RVO:68081731
Keywords : Metallic nanoparticles * Optical trapping * Heating * Generalized Lorenz-Mie theory
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 2.288, year: 2013

We have investigated the absorbed power in a single gold or silver metallic nanoparticle together with the optical force acting upon it if the particle is illuminated by two counter-propagating plane waves forming a standing wave. We have used the Generalized Lorenz-Mie theory (GLMT) and considered the incident wavelengths 250 nm <= lambda(vac) <= 1250 nm and particles size parameter 0.1 <= d/lambda(vac) <= 4. Similarly as in the case of dielectric particle we have found that the optical force is equal to zero for all particle positions in the standing wave for certain wavelengths and particle sizes. However, in the case of a metallic object this phenomenon occurs for considerably smaller particles and the conditions change considerably with the illuminating wavelength especially near the localized surface plasmon resonances. Similarly, we have found that the absorbed heat does not change with the position of the particle in the standing wave for certain wavelengths and particle sizes. These sizes generally differ from those giving zero optical force and, therefore, the particle can be trapped at the intensity maximum or minimum and in both cases its heating is maximal or minimal depending on the particle size.
Permanent Link: http://hdl.handle.net/11104/0225333