Design of a lithium niobate-on-insulator-based optical microring resonator for biosensing applications

作者：Naznin Shakila^*; Sher Md Sohel Mahmud

来源：Optical Engineering, 2016, 55(8): 087108.

DOI：10.1117/1.OE.55.8.087108

• optical microring resonator
• biosensor
• ridge waveguide
• lithium niobate-on-insulator
• sensitivity
• detection limit

A label-free optical microring resonator biosensor based on lithium niobate-on-insulator (LNOI) technology is designed and simulated for biosensing applications. Although silicon-on-insulator technology is quite mature over LNOI for fabricating more compact microring resonators, the latter is attractive for its excellent electro-optic, ferroelectric, piezoelectric, photoelastic, and nonlinear optic properties, which can offer a wide range of tuning facilities for sensing. To satisfy the requirement of high sensitivity in biosensing, the dual-microring resonator model is applied to design the proposed sensor. The transmission spectrum obtained from twodimensional simulations based on finite-difference time-domain method demonstrates that the designed LNOI microring sensor consisting of a 10-mu m outer ring and a 5-mu m inner ring offers a sensitivity of similar to 68 nm/refractive index unit (RIU) and a minimum detection limit of 10(-2) RIU. Finally, the sensor's performance is simulated for glucose sensing, a biosensing application.

• 出版日期2016-8