Technology Map (IMAGE) Singapore University of Technology and Design Caption Figure 1: This is a technology map of optical refractive index sensors. A 3D plot of various representative sensing structures in the map of bulk refractive index sensitivity (x-axis), figure of merit (y-axis), and working wavelength (z-axis). Credit SUTD Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.