By connecting output waveguides to the circular cavity, Prof. Huang Yongzhen’s group of the Institute of Semiconductors found that mode coupling between two whispering-gallery modes with near wavelengths results in coupled mode with polygonal field distribution, which can be used to realize unidirectional emission and even three-port or four-port microlasers. In addition, coupled microcircular resonators tangentially coupled to a middle bus waveguide were simulated and high efficiency directional emission was predicted. Based on the mode analysis, circular and coupled circular microcavity lasers were fabricated by planar technology, and continuous wave electrically injected operations were achieved at room temperature. The work was awarded 2010 China Optics Important Achievements by "Laser & Optoelectronics Progress" magazine.
Anticipating the work, Dr. Yang Yuede and Dr. Wang Shijiang received the President Award of Chinese Academy of Sciences in 2009 and 2010, respectively. In addition, Dr. Yang Yuede was awarded nomination prize of Excellent Doctoral Dissertation of Chinese Academy of Sciences in 2010. The related works were published in Optics Letters, Optics Express, and IEEE Photonics Technology Letters, and Semiconductor Science and Technology in 2010.
Photo of the award celebration for 2010 China Optics Important Achievements