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Published April 2015 | public
Journal Article

Thermally Controllable Silicon Photonic Crystal Nanobeam Cavity without Surface Cladding for Sensing Applications


Photonic crystal nanobeam cavities with high-quality factors are very sensitive to the dielectric properties of their surroundings. Combining this high sensitivity with a specially designed heater, we experimentally demonstrate a very sensitive optical sensor, capable of simultaneously providing heat and interrogating the refractive index of its surroundings. The structure presents experimental sensitivity of 98 nm/RIU and signal-to-noise ratio of 3.88 × 10^(–4) RIU and provides approximately 100 °C of temperature variation in the sensing area, with a temperature switching time of a few microseconds.

Additional Information

© 2015 American Chemical Society. Received: December 28, 2014. Publication Date (Web): March 23, 2015. W.S.F., S.N., and A.S. thank the NSF CIAN ERC (Grant EEC-0812072), Sanofi S. A., and the Gates Foundation for the financial support. V.R.A. thanks CNPq for Grants 483116/2011-4 and 312029/2013-6 and CAPES for the PVS-ITA Grant. N.P. and P.O'B. thank the Irish Photonics Integration Centre (www.ipic.ie) under Science Foundation Ireland (Grant No. 12/RC/2276).

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March 5, 2024