Opt Lett. 2018 Nov 1;43(21):5194-5197. doi: 10.1364/OL.43.005194.
We demonstrate on-waveguide thermo-optic tuners based on solution-processed metallic carbon nanotubes (CNTs) on silicon-on-insulator (SOI) and silicon nitride (SiN) microring resonators operating around 1550 nm. On SOI microring resonators using planarized wire waveguides, a thermo-optic power efficiency of 29 mW/FSR and a thermal transient of 1.3 μs are achieved. The heater is shown to be more power-efficient than conventional metal heaters and has lower thermal transient than both metal heaters and graphene-based heaters. On SiN microring resonators using rib waveguides, improvement in power efficiency with an increase in coverage of CNTs is demonstrated, indicating localized heating using the CNTs; this is favorable for low thermal cross-talk. An optimal power efficiency of 142 mW/FSR and a thermal transient of 5.8 μs are achieved.
我们展示了基于在硅片上绝缘体 (SOI) 和氮化硅 (SiN) 微环谐振器上溶液处理的金属碳纳米管 (CNT) 的波导上热光调谐器，其工作波长在 1550nm 左右。在使用平面化线波导的 SOI 微环谐振器中，实现了 29mW/FSR 的热光功率效率和 1.3μs 的热瞬态。结果表明，与传统的金属加热器相比，该加热器具有更高的功率效率，并且其热瞬态比金属加热器和基于石墨烯的加热器都要低。在使用脊形波导的 SiN 微环谐振器中，随着 CNT 覆盖率的增加，功率效率得到了提高，这表明 CNT 实现了局部加热；这有利于降低热串扰。实现了 142mW/FSR 的最佳功率效率和 5.8μs 的热瞬态。
