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Article

Strip-loaded horizontal slot waveguide for routing microdisk laser emission

Journal of the Optical Society of America B: Optical Physics. 2020. Vol. 37. No. 6. P. 1878-1885.
Фетисова М. В., Kryzhanovskaya N., Редуто И. В., Журихина В. В., Морозова О., Расходчиков А., Roussey M., Pelisset S., Кулагина М. М., Гусева Ю. А., Липовский А. А., Максимов М. В., Zhukov A.

A strip-loaded horizontal slot waveguide is used for routing the emission of a microdisk laser. The active region of the laser is InAs/InGaAs/GaAs quantum dots operating in continuous wave mode under optical pumping. Although the quantum dots emit in a broad range, the laser emission is single-mode with λ = 1290 nm. Atomic layer deposition is used for the fabrication of the TiO₂/SiO₂/TiO₂ slot waveguide covering the 10-μm-diameter disk. The horizontal slot waveguide covers the microdisk and traps the emission into the fundamental TM mode of the three-stack layer. Once light is localized inside this planar waveguide, a loading-strip creates an effective index difference, which is sufficient to confine the mode laterally and leads to the guiding of the lasing emission. An analytical model for the 5-layers horizontal planar slot waveguide was developed in order to optimize the slot waveguide according to the operation wavelength of the microlaser and the different materials involve. Scanning near-field optical microscopy is used to observe propagation of light within the waveguide and confirm the mode coupling into it and therefore the guiding along the loading strip. The device being inherently low loss, this first demonstration of a microdisk laser with a horizontal slot waveguide opens a path towards challenging application such as quantum computing integrated chips.