Practical sub-λ/2 acoustic focusing using a liquid-immersed metamaterial lens

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http://urn.fi/URN:NBN:fi:hulib-202105102095
Title: Practical sub-λ/2 acoustic focusing using a liquid-immersed metamaterial lens
Author: Kekkonen, Tuukka
Contributor: University of Helsinki, Faculty of Science
Publisher: Helsingin yliopisto
Date: 2021
Language: eng
URI: http://urn.fi/URN:NBN:fi:hulib-202105102095
http://hdl.handle.net/10138/329719
Thesis level: master's thesis
Degree program: Materiaalitutkimuksen maisteriohjelma
Master's Programme in Materials Research
Magisterprogrammet i materialforskning
Specialisation: Elektroniikka ja teollisuusfysiikka
Electronics and Industrial Physics
Elektronik och industrifysik
Abstract: The sub-λ/2 focusing, also known as super resolution, is widely studied in optics, but only few practical realizations are done in acoustics. In this contribution, I show a novel way to produce sub- λ/2 focusing in the acoustic realm. I used an oil-filled cylinder immersed in liquid to focus an incident plane wave into a line focus. Three different immersion liquids were tested: water, olive oil, and pure ethanol. In addition to the practical experiment, we conducted a series of finite element simulations, by courtesy of Joni Mäkinen, to compare to the experimental results.
Subject: Acoustic
jet
ultrasonics
microscopy
super resolution
diffraction limit


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