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. 2014 Sep 11;4:6340. doi: 10.1038/srep06340

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Time-resolved photoluminescence measurements of Coumarin dye on various samples, Ref (pink), HMM (red), HMM with Ag (black), and GCHMM (blue)) with emission wavelength: (a) in elliptical region (λ_e = 420 nm), (b) at critical wavelength (λ_c = 430 nm), and (c) in hyperbolic region (λ_e = 450 nm).