Figure 2.

Examples of lens free fluorescence microscopes. (a) Cells are flown in a microfluidic chip that is in attached to a filter coated imaging sensor; fluorescent excitation is achieved using side illumination through a rhomboid prism (reproduced with permission from Ref. 71, with permission from The Royal Society of Chemistry). (b) A Fresnel Zone Plate creates an array of foci inside the channel; the sample flows across the array of focused light spots and the fluorescence emissions are collected by the sensor (reproduced from Ref. 73 with permission from The Royal Society of Chemistry). [Color figure can be viewed at http://wieyonlinelibrary.com]