title: Integrated label-free optical biochemical sensor with a large measurement range based on an angular grating-microring resonator.
abstract: We propose and design a photonic-integrated optical biochemical sensor, which comprises a microring resonator and angular gratings in a silicon-on-insulator waveguide. With the combination of the angular gratings, the measurement range of the angular grating-microring resonator-based sensor significantly increases without the restriction of a free spectral range. Optimization of the several key structural parameters is investigated to achieve favorable transmission properties. A high-quality factor of more than 1.03×105can meet the requirements of high sensitivity and low detection limit. The simulation results on the biochemical bulk sensing show that a concentration sensitivity of more than 95.27 pm/% and detection limit of less than 0.329% can be obtained. A large measurement range of 50.2 nm is achieved by the combination of the angular gratings. The investigation on the combination of microring resonator and angular grating is a valuable exploration of the liquid and gas biomedical sensing for the ultra-large measurement range.
authors.forename: Tao
authors.initials: T
authors.lastname: Ma
authors.forename: Lei
authors.initials: L
authors.lastname: Sun
authors.forename: Jinhui
authors.initials: J
authors.lastname: Yuan
authors.forename: Xinzhu
authors.initials: X
authors.lastname: Sang
authors.forename: Binbin
authors.initials: B
authors.lastname: Yan
authors.forename: Kuiru
authors.initials: K
authors.lastname: Wang
authors.forename: Chongxiu
authors.initials: C
authors.lastname: Yu