Arrow structures for sensing applications

In this paper two sensing applications of Antiresonant Reflecting Optical Waveguide (ARROW) structures are proposed. In the first, we show that, by a suitable design, a conventional ARROW waveguide can be turned in an integrated optical refractometer useful in chemical and biochemical sensing. In the second application, using some peculiar properties of ARROW structures, we have designed and realized an integrated flow cell by an hollow core ARROW waveguide.