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CNT micro-heater on SOI micro-ring resonator

Dash, A and Mere, V and Yasasvi, GPR and Nambiar, SR and Naik, A and Selvaraja, SK (2019) CNT micro-heater on SOI micro-ring resonator. In: 2D Photonic Materials and Devices II 2019, 6 - 7 February 2019, San Francisco.

Full text not available from this repository.
Official URL: https://doi.org/10.1117/12.2509688


Wavelength-selective integrated photonic devices in silicon-photonic platform require tuning to match the operating wavelength of multiple devices. The operating wavelengths are generally in the near-IR band. The conventional method of choice is to thermally tune the refractive index of silicon using metal micro-heaters. However, metals absorb near-IR wavelengths and must be placed away from the waveguides to avoid optical losses. This significantly reduces the power-efficiency of the heaters. Graphene-based local heaters on top of waveguides have been recently explored. Although the absorption in graphene is less than that of metals, it is still large enough to necessitate the placement of a thin spacer between the waveguide and the heater. We observe that metallic carbon-nanotubes (CNTs) are comparatively more transparent in the C-band. We implement heaters made of solution-processed metallic CNTs directly on top of a silicon-on-insulator micro-ring resonator. We demonstrate thermo-optic tuning of 60 pm/mW on a micro-ring resonator having a free-spectral range (FSR) of 1.75 nm. The estimated power efficiency is 29 mW/FSR, which is at par with previously implemented graphene-based heaters, that has higher absorption and better than conventional metal heaters. The proposed configuration offers compact and efficient thermal-tuner integration.

Item Type: Conference Paper
Publication: Proceedings of SPIE - The International Society for Optical Engineering
Publisher: SPIE
Additional Information: The copyright for this article belongs to SPIE.
Keywords: Carbon nanotubes; Efficiency; Electric losses; Graphene; Heating equipment; Metals; Optical resonators; Refractive index; Silicon on insulator technology; Silicon photonics; Waveguides; Yarn, Conventional methods; Free spectral range; Integrated photonic devices; Metallic carbon nanotubes; Micro-heaters; Operating wavelength; Thermooptic effects; Wavelength-selective, Photonic devices
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 23 Nov 2022 05:11
Last Modified: 23 Nov 2022 05:11
URI: https://eprints.iisc.ac.in/id/eprint/77963

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