This article is cited in 2 papers

Biophotonics

Monitoring the temperature of silicon nanoparticles in liquid by Raman scattering method with nanosecond pulsed laser excitation

N. S. Pokryshkin^ab, I. D. Kuchumov^a, V. G. Yakunin^a, V. Yu. Timoshenko<sup>ab

a</sup> Faculty of Physics, Lomonosov Moscow State University
^b National Engineering Physics Institute MEPhI Engineering and Physics Institute of Biomedicine, Moscow

Abstract: Photoinduced pulsed heating of silicon nanoparticles suspension (NPs) excited by continuous and pulsed nanosecond laser radiation was studied with the use of Raman spectroscopy (RS). Basing on the ratio of the intensities of the Stokes and anti-Stokes components of Raman scattering, we determined temperatures of NPs and liquid (alcohol) in suspension. It was found that silicon NPs heat up more than the surrounding liquid, which is due to their higher absorption coefficient at the excitation wavelength. When heated by nanosecond laser pulses by the Raman method, a strong short-term overheating of both the NPs and the surrounding liquid is recorded, but the time-average temperature of the suspension remains low. The results obtained show that Raman spectroscopy is a convenient non-contact method for simultaneous temperature monitoring of both nanoparticles and the surrounding liquid medium, and this is important for biomedical applications of nanoparticles, in particular in photothermal cancer therapy.

Keywords: silicon nanoparticles, Raman scattering, photoheating, temperature measurement, hyperthermia.

Received: 17.03.2023
Revised: 20.06.2023

 English version: Quantum Electronics, 2023, 50:suppl. 10, S1163–S1168