Single-crystal organic nanowires were fabricated with a soft-template-assisted self-assembly method in liquid phase. These nanowires with rectangular cross section can serve as resonators for exciton-photon coupling, leading to a microcavity effect and a relatively low threshold of laser actions. Two-photon-pumped blue lasing was observed in these organic waveguiding nanostructures above a threshold of 60 nJ, excited with a 750 nm near-infrared femtosecond pulse laser at 77 K.

Light is usually confined in photonic structures with a band gap or relatively high refractive index for broad scientific and technical applications. Here, a light confinement mechanism is proposed based on the photonic bound state in the continuum (BIC). In a low-refractive-index waveguide on a highrefractive-index thin membrane, optical dissipation is forbidden because of the destructive interference of various leakage channels. The BIC-based low-mode-area waveguide and high-Q microresonator can be used to enhance light-matter interaction for laser, nonlinear optical and quantum optical applications. For example, a polymer structure on a diamond membrane shows excellent optical performance that can be achieved with large fabrication tolerance. It can induce strong coupling between photons and the nitrogen-vacancy center in diamond for scalable quantum information processors and networks.

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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.