Affiliation:
1. ECE Department, University of Alberta , 9211-116 St. NW, Edmonton, Alberta T6G 1H9, Canada
Abstract
The bulk acoustic modes of liquid droplets, well understood from a theoretical perspective, have rarely been observed experimentally. Here, we report the indirect observation of acoustic vibrational modes in a picoliter-scale droplet, extending up to ∼40 MHz. This was achieved by coupling the droplet to an ultra-sensitive optomechanical sensor, which operates in a thermal-noise limited regime and with a substantial contribution from acoustic noise in the ambient medium. The droplet vibrational modes manifest as Fano resonances in the thermal noise spectrum of the sensor. This is among the few reported observations of droplet acoustic modes and of Fano interactions in a coupled mechanical oscillator system driven only by thermal Brownian motion.
Funder
Natural Sciences and Engineering Research Council of Canada
Alberta Innovates
Alberta Major EDT Innovation Fund
Subject
Physics and Astronomy (miscellaneous)
Cited by
2 articles.
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