“…phase shift per RI unit, that can be used is only limited to the loss of the sensor. By using a short wavelength laser (450 nm), a large increase in phase shift is realized in comparison to most of previous works [9,14,15,18,21,26,[28][29][30], which operates with a laser above 630 nm. The sensitivity for homogeneous bulk RI sensing of this sensor is comparable to those made by only polymers [9,19,31] or optical fiber [5].…”