Photonic ring structures can provide better photon confinement than1D structures. Organic molecules are self-assembled into high-quality crystalline microrings in evaporating microdroplets. These size-tunable microrings could efficiently confine their fluorescence, and serve as active whispering-gallery-mode resonators with quality factors over 300, providing great possibilities for a series of fundamental components in integrated photonic circuits.
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Zhang et al. (2013) studied this question.
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