Abstract
The mechanically scanned microscope using acoustic radiation in water near 3 GHz has a resolution comparable to the optical microscope and the details that appear in the optical micrograph now appear in the acoustic micrographs. In addition it is now possible to probe some of the subsurface detail on objects—en;such as metallic layers—that are opaque to optical waves. This feature suggests that the acoustic microscope may have a unique role in the continuing exploration of the microscopic world. With biological samples acoustic microscopy permits one to record images with large contrast in unstained cells. In this talk we will discuss the latest work in this field. We will include images from an instrument immersed in a cryogenic fluid (liquid argon). There the wavelength is now 4000 Å with great hope for much shorter wavelengths in future microscopes. [Work supported by AFOSR and ONR.]
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