Direct measurement of the temperature profile close to an optically trapped absorbing particle

0464946 - ÚPT 2017 RIV US eng J - Journal Article
Šiler, Martin - Ježek, Jan - Jákl, Petr - Pilát, Zdeněk - Zemánek, Pavel
Direct measurement of the temperature profile close to an optically trapped absorbing particle.
Optics Letters. Roč. 41, č. 5 (2016), s. 870-873. ISSN 0146-9592. E-ISSN 1539-4794
R&D Projects: GA ČR GPP205/12/P868
Institutional support: RVO:68081731
Keywords : gold nanoparticles * fluorescence * spectroscopy * tweezers
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 3.416, year: 2016

surface temperature of an absorbing particle trapped in optical tweezers (OTs) is measured using a mixture of two fluorescent dyes. We analyze the dependence of temperature on both laser power and the radial distance from its surface, and we verify the 1/r decrease of temperature with increasing distance from the particle surface. We detect the variations of spectral profiles as the medium temperature changes. The temperature dependent signal, i.e., the ratio of summed intensities from two distinct spectral regions, is affected by the convolution of temperature profile with transfer function of the spectroscopic system. We analyze this effect and determine the temperature increase on the surface of a core-shell particle trapped by OTs.
Permanent Link: http://hdl.handle.net/11104/0263683