We demonstrate wide-angle emission and single mode operation in deformed circular microlasers with a flat side. The mode characteristics of a metallic confined deformed circular resonator with a flat side are investigated by finite-difference time-domain simulation. The numerical results indicate that this structure is suitable to realize wide-angle emission. Furthermore, metallic confined deformed circular microlasers with a flat side are fabricated using common photolithography and inductively coupled-plasma etching techniques. A continuous-wave single-mode operation with a side mode suppression ratio of 25 dB is achieved at an injection current of 4 mA for an 8 μm radius microlaser with a flat side. Additionally, wide angle emission over 120° is observed from the far-field pattern.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: April 6, 2012
Manuscript Accepted: May 20, 2012
Published: June 8, 2012
Jian-Dong Lin, Ling-Xiu Zou, Yong-Zhen Huang, Yue-De Yang, Qi-Feng Yao, Xiao-Meng Lv, Jin-Long Xiao, and Yun Du, "Wide-angle emission and single-mode deformed circular microlasers with a flat side," Appl. Opt. 51, 3930-3935 (2012)