Increasing the coupling efficiency of a microdisk laser to waveguides by using well designed spiral structures

Danyu Liu, Haroldo T. Hattori, Lan Fu, Hark Hoe. Tan, Chennupati Jagadish
2010 Journal of Applied Physics  
In this article, we optimize the coupling efficiency from a GaAs microdisk resonator into a single mode spiral waveguide. A classical microdisk resonator coupling light into a nonevanescent straight waveguide reaches a typical coupling efficiency of 67%. We show that the introduction of a spiral waveguide that works both as a waveguide and circular Bragg reflector can improve such efficiency to almost 90%. The same structure with the addition of a taper can couple up to 80% of the generated
more » ... f the generated power into a slot waveguide. Downloaded 05 May 2011 to 130.56.107.35. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions 043105-5 Liu et al. J. Appl. Phys. 107, 043105 ͑2010͒ Downloaded 05 May 2011 to 130.56.107.35. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions 043105-6 Liu et al. J. Appl. Phys. 107, 043105 ͑2010͒ Downloaded 05 May 2011 to 130.56.107.35. Redistribution subject to AIP license or copyright; see http://jap.aip.org/about/rights_and_permissions
doi:10.1063/1.3309748 fatcat:itu6rtbrvbezfmddngwofptgsi