Abstract
Using Michelson interferometry, we have observed thermal vibrations on the surface (ripplon) of a liquid droplet adhered to the tip of an optical fiber. By causing the liquid droplet to adhere to the tip of an optical fiber, we are able to observe the ripplon with a very small quantity (10-7 cm3) of liquid. Moreover, the measurement is possible without being influenced by the direction of gravity or the vibration of the measurement environment, since the liquid adheres strongly to the optical fiber by intermolecular force. The ripplon spectrum on the surface of the oil droplet adhered to the tip of an optical fiber of diameter 80 µm was observed to be uniform up to 1 kHz and decreased as 1/f above 1 kHz. We observed the ripplon standing waves at nearly 20 kHz on surfaces of ethanol, methanol and water.
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