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Microscopic fluorescence images of the beam shapes within the microchannel filled with Rhodamine B. (a) The real light propagation diagram from device without microlens; (b) The real light propagation diagram within the channel from device with microlens. Reprinted with permission from Li et al., Proc. SPIE 10024, 100240J (2016). Copyright 2016 Society of Photo-Optical Instrumentation Engineers.42
