An important building
block for on-chip photonic applications is
a scaled emitter. Whispering gallery mode cavities based on III–Vs
on Si allow for small device footprints and lasing with low thresholds.
However, multimodal emission and wavelength stability over a wider
range of temperature can be challenging. Here, we explore the use
of Au nanorod antennae on InP whispering gallery mode lasers on Si
for single-mode emission. We show that by proper choice of the antenna
size and positioning, we can suppress the side modes of a cavity and
achieve single-mode emission over a wide excitation range. We establish
emission trends by varying the size of the antenna and show that the
far-field radiation pattern differs significantly for devices with
and without antenna. Furthermore, the antenna-induced single-mode
emission is dominant from room temperature (300 K) down to 200 K,
whereas the cavity without an antenna is multimodal and its dominant
emission wavelength is highly temperature-dependent.
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