Freestanding nanowire ring laser

We demonstrate a freestanding nanowire ring laser, assembled by splicing the two ends of a CdS nanowire via a dissolved polymer nanowire. With ring diameter of less than 50 mu m, the free-standing nanowire ring laser shows low lasing threshold, high robustness, and excellent mechanical flexibility. Also, the nanowire ring laser works well in liquid environment, showing the possibility of integrating the nano-ring laser into an optofluidic system.