Caustic imaging of gallium droplets using mirror electron microscopy |
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Authors: | Kennedy S M Zheng C X Tang W X Paganin D M Jesson D E |
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Affiliation: | School of Physics, Monash University, Victoria 3800, Australia |
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Abstract: | We discuss a new interpretation of mirror electron microscopy (MEM) images, whereby electric field distortions caused by surface topography and/or potential variations are sufficiently large to create caustics in the image contrast. Using a ray-based trajectory method, we consider how a family of rays overlaps to create caustics in the vicinity of the imaging plane of the magnetic objective lens. Such image caustics contain useful information on the surface topography and/or potential, and can be directly related to surface features. Specifically we show how a through-focus series of MEM images can be used to extract the contact angle of a Ga droplet on a GaAs (001) surface. |
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Keywords: | Mirror electron microscopy (MEM) Caustic imaging Ga droplets GaAs Contact angle |
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