Reflection interference microscopy surface topography

Many researchers have performed various optical microscopic observations of the surface morphology of ice crystals, such as steps [10, 20-23], height topography [24-31], and QLLs [32, 33], by ordinary bright field microscopy [10, 23, 24], differential interference contrast microscopy [20-22, 25, 29-31, 33], two-beam interferometry [26-28], and laser reflection microscopy [32], However, no one has yet succeeded in proving, by their optical observations, that they could visuahze individual elementary steps, mainly due to the small height of elementary steps. 

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