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Long term micro-lens effect. (a) Timecourse of the intensity and (b) images of E.coli bacteria acquired with lensless imaging as a function of the evaporation time. The bacteria is first undetectable (1), but is revealed when in the meniscus (2) and is amplified after thin film formation (3). The glass cover slip is here hydrophilic, a thin wetting film remains after the evaporation and so does the image of E.coli bacteria.
