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Authors: S. Kumar, N. Le Thomas
Title: Imaging of photonic crystal cavity mode via refractive index sensing
Format: International Conference Proceedings
Publication date: 11/2016
Journal/Conference/Book: Proceedings of the 21st Annual Symposium of the IEEE Photonics Benelux Chapter
Volume(Issue): p.255-258
Location: Gent, Belgium
Citations: Look up on Google Scholar
Download: Download this Publication (470KB) (470KB)


Silicon (Si) based integrated Photonic Crystal (PhC) cavities show great promise for biosensing applications, owing to their high Quality (Q) factor, low mode volume and compatibility with Complementary metal–oxide–semiconductor (CMOS) fabrication. We present the development of a new experimental technique to experimentally determine the sensing properties of PhC cavity mode. It makes use of a silica nano-tip fiber that moves in the near field of the PhC cavity and of a high numerical microscope objective that collects the field radiated out-of plane from the cavity. Measuring the intensity fluctuations that are induced by the nano tip via local perturbation of the refractive index allows us to map the intensity profile of the cavity mode.

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