Tiwari Preksha, Fischer Anna, Scherrer Markus, Caimi Daniele, Schmid Heinz, Moselund Kirsten E
IBM Research Europe-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
ACS Photonics. 2022 Apr 20;9(4):1218-1225. doi: 10.1021/acsphotonics.1c01677. Epub 2022 Mar 17.
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.
用于片上光子应用的一个重要组成部分是缩小尺寸的发射器。基于硅上的III-V族材料的回音壁模式微腔可实现小尺寸器件以及低阈值激光发射。然而，在较宽温度范围内的多模发射和波长稳定性可能具有挑战性。在此，我们探索在硅基InP回音壁模式激光器上使用金纳米棒天线来实现单模发射。我们表明，通过适当选择天线尺寸和位置，可以抑制微腔的边模，并在很宽的激发范围内实现单模发射。我们通过改变天线尺寸确定了发射趋势，并表明有无天线的器件的远场辐射模式有显著差异。此外，天线诱导的单模发射在从室温（300 K）到200 K的温度范围内占主导，而没有天线的微腔是多模的，其主导发射波长高度依赖于温度。
