Multiplexed refractive index-based sensing using optical fiber microcavities

Stephen C. Warren-Smith; Ricardo M. André; Jan Dellith; Hartmut Bartelt

doi:10.1117/12.2227113

29 April 2016 Multiplexed refractive index-based sensing using optical fiber microcavities

Stephen C. Warren-Smith, Ricardo M. André, Jan Dellith, Hartmut Bartelt

Proceedings Volume 9899, Optical Sensing and Detection IV; 98991G (2016) https://doi.org/10.1117/12.2227113
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

Optical fibers are promising tools for performing biological and biomedical sensing due to their small cross section and potential for multiplexing. In particular, fabricating ultra-small sensing devices is of increasing interest for measuring biological material such as cells. A promising direction is the use of interferometric techniques combined with optical fiber post-processing. In this work we present recent progress in the development of Fabry-Perot micro-cavities written into optical fiber tapers using focused ion beam (FIB) milling. We first demonstrate that FIB milled optical fiber microcavities are sensitive enough to measure polyelectrolyte layer deposition. We then present new results on the fabrication and optical characterization of serially-multiplexed dual cavity micro-sensors. Two cavities were written serially along the fiber with two different cavity lengths, producing a total of four reflecting surfaces and thus six possible interferometric pairs/cavities. By using fast Fourier transform it is possible to obtain de-multiplexed measurements for each cavity. This will be particularly important for bioassays where positive and negative controls are required to be measured within close spatial proximity.

Citation Download Citation

Stephen C. Warren-Smith, Ricardo M. André, Jan Dellith, and Hartmut Bartelt "Multiplexed refractive index-based sensing using optical fiber microcavities", Proc. SPIE 9899, Optical Sensing and Detection IV, 98991G (29 April 2016); https://doi.org/10.1117/12.2227113

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available