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Proceedings Paper

Subpicometer thermal shifts in silicon photonic micro-ring resonators with sol-gel claddings (Conference Presentation)
Author(s): Soha Namnabat; Kyung-Jo Kim; Adam M. Jones; Roland Himmelhuber; Christopher T. DeRose; Andrew Pomerene; Tony L. Lentine; Robert A. Norwood

Paper Abstract

Electronic interconnects are reaching their limit in terms of speed, dimensions and permissible power consumption. This has been a major concern in data centers and large scale computing platforms, creating limits to their scalability especially with respect to power consumption. Silicon photonic-electronic integration is viewed as a viable alternative that enables reliability, high efficiency, low cost and small footprint. In particular, silicon with its high refractive index, has enabled the integration a many individual optical elements (ring resonators) in small areas. Though silicon has a high thermo-optic coefficient (1.8×10^-4/°C) compared to silica, small thermal fluctuations can affect the optical performance especially for WDM applications. Therefore, a passive athermal solution for silicon photonic devices is required in order to reduce thermal sensitivity and power consumption. We have achieved this goal by replacing the silica top cladding with negative thermo-optic coefficient (TOC) materials. While polymers and titanium dioxide(titania) have a negative TOC, polymers can’t handle high temperature processing and titania needs very tight thickness control and expensive deposition under vacuum. In this work we propose to use a sol-gel inorganic-organic hybrid material that has the benefits of both worlds. We were able to find optimum curing conditions to athermalize ring resonators by studying various sol-gel curing times and curing temperatures. Our athermal rings operate in a wide temperature range from 5C – 100C with thermal shifts below 1pm/C and low loss. Furthermore, we demonstrate that our athermal approach does not deleteriously effect critical device parameters, such as insertion loss and resonator Q factors.

Paper Details

Date Published: 19 April 2017
PDF: 1 pages
Proc. SPIE 10106, Integrated Optics: Devices, Materials, and Technologies XXI, 101061E (19 April 2017); doi: 10.1117/12.2251920
Show Author Affiliations
Soha Namnabat, The Univ. of Arizona (United States)
Kyung-Jo Kim, The Univ. of Arizona (United States)
Adam M. Jones, Sandia National Labs. (United States)
Roland Himmelhuber, The Univ. of Arizona (United States)
Christopher T. DeRose, Sandia National Labs. (United States)
Andrew Pomerene, Sandia National Labs. (United States)
Tony L. Lentine, Sandia National Labs. (United States)
Robert A. Norwood, College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 10106:
Integrated Optics: Devices, Materials, and Technologies XXI
Sonia M. García-Blanco; Gualtiero Nunzi Conti, Editor(s)

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