A simple integrated optical refractometric sensor based on hollow-core antiresonant reflecting optical waveguides is proposed. The sensor uses the antiresonant reflecting guidance mechanism and permits one to measure the refractive index of a liquid filling the core by simply monitoring the transmitted spectrum. The device has been made with standard silicon technology, and the experimental results confirm numerical simulations performed in one- and two-dimensional geometry. The sensor exhibits a linear response over a wide measurement range (1.3330–1.4450) and a resolution of 9×10<sup>-4</sup> and requires a small analyte volume.
© 2004 Optical Society of America
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(230.3120) Optical devices : Integrated optics devices
(230.7380) Optical devices : Waveguides, channeled
Stefania Campopiano, Romeo Bernini, Luigi Zeni, and Pasqualina M. Sarro, "Microfluidic sensor based on integrated optical hollow waveguides," Opt. Lett. 29, 1894-1896 (2004)