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The self-assembled organic microspheres of ( E )-3-(4-(dip-tolylamino)phenyl)-1-(4-fluoro-2-hydroxyphenyl)prop-2-en-1-one (DTPHP) function as active whispering-gallery-mode (WGM) resonators with high group refractive index.
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Yi et al. (2019) studied this question.
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