Sonoluminescence: Experiments and models (Review)

Abstract

Three models of the sonoluminescence source formation are considered: the shock free compres sion model, the shock wave model, and the polarization model. Each of them is tested by experimental data on the size of the radiating region and the angular radiation pattern; the shape and duration of the radiation pulse; the influence of the type of liquid, gas composition, surfactants, sound frequency, and temperature of the liquid on the radiation intensity; the characteristics of the shock wave in the liquid; and the radiation spec tra. It is shown that the most adequate qualitative explanation of the entire set of experimental data is given by the polarization model. Methods for verifying the model are proposed. Publications devoted to studying the possibility a thermonuclear fusion reaction in a cavitation system are reviewed.

On the Second Light Flash Emitted From a Spark-Generated Bubble Oscillating in Water

“…Although the light emission from oscillating bubbles has been intensively studied in many laboratories for several decades (see, e.g., works [8-13, 15-18, 20, 21, 26], and the recent review by Borisenok [22]), only very limited quantitative experimental data are still available at present, and therefore understanding of the physical or chemical processes taking place in oscillating bubbles is currently very difficult. In a review paper [22], many theories trying to explain the light emission from oscillating bubbles are mentioned, but none of the theoretical models can explain the experimental data presented in this work and in references [24,25,27,28]. For example, as can be seen in Figures 2, 3 and 5, the shape of the pulses u 1 (t) and u 2 (t) and their timing with respect to the bubble wall motion at first sight exclude the "hot spot" theory preferred by most researchers [22].…”

“…In a review paper [22], many theories trying to explain the light emission from oscillating bubbles are mentioned, but none of the theoretical models can explain the experimental data presented in this work and in references [24,25,27,28]. For example, as can be seen in Figures 2, 3 and 5, the shape of the pulses u 1 (t) and u 2 (t) and their timing with respect to the bubble wall motion at first sight exclude the "hot spot" theory preferred by most researchers [22]. And both the shape of the pulse p 1 (t) (single pulse) and its position relative to the pulses u 1 (t) and u 2 (t) exclude the explanation…”

“…As mentioned in the Introduction, beside the spark-generated bubbles studied here, other types of bubbles were also intensively used to investigate light emission. Most extensive data on light pulses were obtained when studying laser-generated bubbles [8-10, 12, 13], and in the case of bubbles oscillating in acoustic resonators [22]. When comparing the experimental data on light emission from sparkgenerated bubbles with data measured with other types of bubbles, certain similarities and certain differences can be observed.…”

“…Over the last three decades, the emission of light from a single bubble oscillating in acoustic resonators has also been intensively studied (see, e.g., a recent review [22], which summarises results from 163 works). An advantage of a method based on acoustic resonators is that relatively small experimental set-ups can be used.…”

Gas Bubble Photonics: Manipulating Sonoluminescence Light with Fluorescent and Plasmonic Nanoparticles

“…However, the aforementioned list of properties and practical applications of bubbles is complete. In this article we focus on the well-established capability of an oscillating bubble to emit light in a broad optical spectral range via the process called sonoluminescence [34][35][36][37][38]. As schematically shown in Fig.…”