Whispering‐Gallery‐Mode Microlaser Based on Self‐Assembled Organic Single‐Crystalline Hexagonal Microdisks

Whispering‐gallery‐mode (WGM) resonators of semiconductor microdisks have been applied for achieving low‐threshold and narrow‐linewidth microlasers, but require sophisticated top‐down processing technology. Organic single‐crystalline hexagonal microdisks (HMDs) of p ‐distyrylbenzene (DSB) self‐assembled from solution can function as WGM microresonators with a cavity quality factor (Q) of 210. Both multiple‐ and single‐mode lasing had been achieved using DSB HMDs with an edge length of 4.3 and 1.2 μm, respectively. These organic microdisks fabricated by bottom‐up self‐assembly approach may offer potential applications as low‐threshold microlaser sources for photonic circuit integration.