This article is cited in 1 paper

Spectroscopy of condensed matter

Generation of supercontinuum in filamentation regime in a water droplet containing silver nanoparticles at low temperature

N. A. Myslitskaya^a, A. V. Tcibulnikova^b, V. A. Slezhkin^a, I. G. Samusev^b, Yu. N. Antipov^a, V. V. Bryukhanov<sup>b

a</sup> Kaliningrad State Technical University
^b Immanuel Kant Baltic Federal University, Kaliningrad

Abstract: Generation of supercontinuum (SC) was studied experimentally both in water droplets containing silver nanoparticles (NP) in the temperature range from 2 to 22$^{\circ}$C and in droplet ice floes frozen to -15$^{\circ}$C. It is established that intensity of SC emission exponentially decays along the droplet diameter following excitation by a train of femtosecond laser pulses and linearly increases with increase in NP concentration. Spectrum of SC emission generated in a water droplet containing NPs is investigated in the presence of localized plasmons producing fluorescence in the vicinity of 430 nm. Propagation of a thermal wave along the diameter ($d$ = 1.0 mm) of a small frozen droplet at a speed of 190 mm/s accompanied by exponentially decaying SC emission is discovered. Mathematical model of heat-transfer processes in an ice floe upon thermal-wave formation is proposed.

Keywords: supercontinuum, filamentation, water droplet, silver nanoparticle, ice floe, thermal wave, speed.

Received: 29.12.2019
Revised: 26.05.2020
Accepted: 14.08.2020

DOI: 10.21883/OS.2020.12.50316.351-20

 English version: Optics and Spectroscopy, 2020, 128:12, 1954–1962

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