|Title||4¯-quasi-phase-matched interactions in GaAs microdisk cavities|
|Publication Type||Journal Article|
|Year of Publication||2009|
|Authors||P. S. Kuo, W. Fang, and G. S. Solomon|
|Keywords||2009, Harmonic generation and mixing, Semiconductor materials, Semiconductor nonlinear optics including MQW, Single Fellow|
We describe quasi-phase-matched nonlinear interactions in materials that possess 4¯ symmetry, such as GaAs. 4¯ symmetry together with curved propagation geometries produce quasi phase matching (QPM) without need of external domain inversions. To improve efficiency of nonlinear optical mixing, 4¯-QPM can be combined with resonant microcavities such as whispering-gallery-mode microdisks. All interacting waves must be resonant with the cavity, which leads to stringent tuning requirements. We show tuning behavior for second-harmonic generation in a GaAs microdisk cavity and estimate that, with milliwatt-level external pumping, approximately 0.1% power-conversion efficiency can be obtained with negligible higher-order nonlinear effects.