Carbon-nanotube-on-waveguide thermo-optic tuners
Optics Letters
|November 2, 2018
Summary
Solution-processed metallic carbon nanotubes (CNTs) offer efficient thermo-optic tuning for silicon and silicon nitride microring resonators. These CNT heaters outperform conventional metal and graphene options in power efficiency and thermal transient response.
Area of Science:
- Photonics and Nanomaterials
- Integrated Optics
Background:
- Microring resonators are crucial for optical signal processing.
- Efficient thermo-optic tuning is essential for dynamic control of microring resonators.
- Conventional heaters face limitations in power efficiency and thermal response.
Purpose of the Study:
- To demonstrate novel on-waveguide thermo-optic tuners using solution-processed metallic carbon nanotubes (CNTs).
- To evaluate the performance of CNT-based heaters on silicon-on-insulator (SOI) and silicon nitride (SiN) microring resonators.
- To compare the power efficiency and thermal transient of CNT heaters against conventional materials.
Main Methods:
- Fabrication of thermo-optic tuners using solution-processed metallic CNTs on SOI and SiN microring resonators.
- Characterization of device performance around 1550 nm wavelength.
- Measurement of thermo-optic power efficiency and thermal transient response.
Main Results:
- On SOI microring resonators, a power efficiency of 29 mW/FSR and a thermal transient of 1.3 μs were achieved.
- CNT heaters demonstrated superior power efficiency and faster thermal transient compared to metal and graphene heaters.
- On SiN microring resonators, localized heating and improved power efficiency were observed with increased CNT coverage.
Conclusions:
- Solution-processed metallic CNTs provide a highly efficient and fast thermo-optic tuning solution for microring resonators.
- CNT-based heaters offer advantages in power efficiency and thermal crosstalk reduction.
- This technology is promising for advanced integrated photonic devices requiring precise optical control.
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