Microcavities: Highly Unidirectional Emission and Ultralow-Threshold Lasing from On-Chip Ultrahigh-Q Microcavities (Adv. Mater. 35/2012)



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Ultra-high-Q optical whispering gallery microcavities are promising platforms for fundamental studies and applied photonics. A new type of on-chip microcavity is experimentally realized, which features both highly unidirectional emission and ultra-high-Q factors exceeding 100 million in near infrared. By doping erbium into the microcavity, lasing emission in 1550 nm band is observed under a convenient freespace optical pumping, with the threshold as low as 2 μW. More details can be found in the article by Q. Gong, Y.-F. Xiao, and co-workers on page OP260.