Sui Shao-Shuai, Huang Yong-Zhen, Tang Ming-Ying, Weng Hai-Zhong, Yang Yue-De, Xiao Jin-Long, Du Yun
Opt Lett. 2016 Sep 1;41(17):3928-31. doi: 10.1364/OL.41.003928.
We propose and demonstrate a locally deformed-ring (LDR) hybrid microlaser to realize stable unidirectional emission from a silicon waveguide. The coupled modes eliminate the competition between clockwise (CW) and counter-clockwise (CCW) modes, and the highly unidirectional characteristics are achieved with an enhanced mode quality factor based on a locally deformed notch in the LDR resonator. Using a divinylsiloxane-benzocyclobutene bonding technique, a LDR hybrid microlaser is fabricated vertically coupled to a silicon waveguide with a radius of 20 μm, a ring width of 4 μm and a notch width of 500 nm. The threshold current is 7 mA, and single-mode lasing is achieved with the side-mode suppression ratio of 27 dB. Nearly total unidirectional output from the CCW direction of a Si waveguide is demonstrated with a unidirectional ratio of 0.053.
我们提出并展示了一种局部变形环（LDR）混合微激光器，以实现硅波导的稳定单向发射。耦合模式消除了顺时针（CW）和逆时针（CCW）模式之间的竞争，并且基于LDR谐振器中的局部变形凹槽，通过提高模式品质因数实现了高度单向特性。使用二乙烯基硅氧烷-苯并环丁烯键合技术，制造了一个垂直耦合到半径为20μm、环宽为4μm且凹槽宽度为500nm的硅波导的LDR混合微激光器。阈值电流为7mA，实现了单模激射，边模抑制比为27dB。展示了从硅波导的CCW方向几乎完全单向输出，单向比为0.053。
