Unidirectional Emission Cut-Corner Square Microcavity Lasers

• Published in: IEEE journal of quantum electronics Vol. 52; no. 2; pp. 1 - 5
• Main Authors: Lu, Ri, Xiao, Jin-Long, Yang, Yue-De, Weng, Hai-Zhong, Long, Heng, Bo, Bao-Xue, Huang, Yong-Zhen
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Cavity resonators; Computer simulation; cut-corner square cavity; Etching; far field; Finite element analysis; Lasers; Mathematical models; Microcavities; Microcavity laser; Optical waveguides; Petals; Q-factor; Resonators; Symmetry; unidirectional emission; Microcavity laser; cut-corner square cavity; unidirectional emission; far field
• ISSN: 0018-9197; 1558-1713
• DOI: 10.1109/JQE.2015.2505578

Square microcavity lasers with a cut-corner are proposed and demonstrated for realizing unidirectional emission single-mode lasers. The mode characteristics of the square resonator with a cut-corner are investigated by 2-D finite-element method simulation. Far field patterns with single petal and double petals are obtained numerically for symmetric and antisymmetric modes, respectively. Square microcavity lasers with a cut-corner are fabricated using planar photolithography and inductively coupled-plasma etching techniques. A continuous wave single-mode operation with a side mode suppression ratio of 31 dB is achieved at an injection current of 25 mA for a 20 μm-side-length square microcavity laser with a cut-corner width of 10 μm. The far field patterns agreement with the simulated symmetric and anti-symmetric modes are observed at different injected currents.