Abstract
Abstract An acoustic microscope operating in He II at temperatures less than 0.2 K has been used for high resolution imaging. The low sound speed and attenuation of helium make it the ultimate fluid for acoustic microscopy. The present resolution of the microscope is 200 A using 300 A (8 GHz) coherent sound radiation. Also, incoherent phonon emission from a heated surface has been imaged using the acoustic microscope as a thermal phonon detector. By virtue of its contrast mechanisms and high resolution, the helium acoustic microscope can image many sample features which cannot be seen in other ways. Present research includes construction of an acoustic microscope with sub-30 A resolution.
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