ABSTRACT
The discovery of fogging on photographic plates by ultrasound waves by Marinesco and Trillat [1], and the fogging accompanied by a faint luminescence [2], led to obtaining sonoluminescence (SL) in various liquids [3]. Photomultiplier tubes (PMTs) enable us to find that the sonoluminescent flashes occur at the end of collapse [4] and occur periodically matched to the frequency of the ultrasound [5]. Fifty-three years after the discovery of SL, Gaitan’s success [6,7] in trapping a single bubble in a standing ultrasonic wave enabled systematic experiments on SL, which unveiled various exotic phenomena on SL [8–10].
