High-Q-preserving coupling between a spiral and a semicircle micro-cavity |
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Authors: | Chern G D Fernandes G E Chang R K Song Q Xu L Kneissl M Johnson N M |
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Affiliation: | Department of Applied Physics, Yale University, CT 06520, USA. gracehern@yahoo.com |
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Abstract: | We present an efficient design for direct coupling between a spiral-shaped and a semicircle-shaped microcavity (micro-cavity) as an alternative to traditional evanescent wave coupling for planar integrated photonic technology. We observe the preservation of the high Q-value of the spiral oscillator when coupled to a semicircle under current injection using an AlGaAs single-quantum-well heterostructure. With slight alterations to the directly coupled micro-cavity configuration, such as coupling shape and overlap distance, the number of observed modes and output intensity are changed. AlGaAs and InGaN spiral-shaped microcavities have unidirectional emission normal to the spiral notch. |
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