Vertical cavity surface emitting laser transverse mode and polarization control by elliptical holes photonic crystal
Cao Tian (曹田)a, Xu Chen (徐晨)a, Xie Yi-Yang (解意洋)a b, Kan Qiang (阚强)b, Wei Si-Min (魏思民)a, Mao Ming-Ming (毛明明)a, Chen Hong-Da (陈弘达 )b
a Key Laboratory of Optoelectronics Technology (Beijing University of Technology), Ministry of Education, Beijing 100124, China; b State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductor, Chinese Academy of Sciences, Beijing 100083, China
Abstract The polarization of traditional photonic crystal (PC) vertical cavity surface emitting laser (VCSEL) is uncontrollable, resulting in the bit error increasing easily. Elliptical hole photonic crystal can control the transverse mode and polarization of VCSEL efficiently. We analyze the far field divergence angle, and birefringence of elliptical hole PC VCSEL. When the ratio of minor axis to major axis b/a=0.7, the PC VCSEL can obtain single mode and polarization. According to the simulation results, we fabricate the device successfully. The output power is 1.7 mW, the far field divergence angle is less than 10°, and the side mode suppression ratio is over 30 dB. The output power in the Y direction is 20 times that in the X direction.
Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2008AA03Z402); the Beijing Municipal Natural Science Foundation, China (Grant Nos. 4092007, 4112006, and 4102003); and the National Natural Science Foundation of China (Grant No. 61076044).
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