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fluorescence biophotonics teacher resource biology microscopy laser nanotechnology imaging optics infrared nanoparticles raman spectroscopy spectroscopy bioluminescence biomedical optics light lasers advanced microscopy cancer biomedical engineering multiphoton microscopy simulation near infrared reflection fluorophore color fiber optics waves blood autofluorescence absorption c. elegans optical tweezers colonoscopy photodynamic therapy (pdt) absorption and the scattering of light poster biophotonics education activities neurophotonics