Abstract
-In this work, the three-dimensional finite-difference time -domain (3D-FDTD) method is used to design and analyze a refractive index sensor based on a slotted photonic crystal nanobeam cavity. These type of cavity support a high quality-factor and a small volume and therefore is attractive for optical sensing. We demonstrate that when immersing our proposed sensor in water it can possess a high-quality factor of 2.0 x 106, high sensitivity of 325 nm/RIU, and a detection limit of 2.4 x 10-7RIU. We believe that our proposed sensor is a promising candidate for potential applications in sensing like optofluidic-and bio-sensing.