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An important building block for on-chip photonic applications is a scaledemitter. Whispering gallery mode cavities based on III-Vs on Si allow for smalldevice footprints and lasing with low thresholds. However, multimodal emissionand wavelength stability over a wider range of temperature can be challenging.Here, we explore the use of Au nanorods on InP whispering gallery mode laserson Si for single mode emission. We show that by proper choice of the antennasize and positioning, we can suppress the side-modes of a cavity and achievesingle mode emission over a wide excitation range. We establish emission trendsby varying the size of the antenna and show that the far-field radiationpattern differs significantly for devices with and without antenna.Furthermore, the antenna-induced single mode emission is dominant from roomtemperature (300 K) down to 200 K, whereas the cavity without an antenna ismultimodal and its dominant emission wavelength is highly temperaturedependent.

Single-Mode Emission in InP Microdisks on Si using Au Antenna