Locally deformed-ring hybrid microlasers exhibiting stable unidirectional emission from a Si waveguide.
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.
Shao-Shuai
SS
Sui
Yong-Zhen
YZ
Huang
Ming-Ying
MY
Tang
Hai-Zhong
HZ
Weng
Yue-De
YD
Yang
Jin-Long
JL
Xiao
Yun
Y
Du