Design Si photonic devices for data centre and telecommunication applications

Abstract

Micro-ring resonator could be used for biochemical sensing applications and many others [1], in this work simulations using LUMERICAL mode will be done by student to gain a better understanding of the design and optimization of micro-ring sensors. The main investigation of this project is index shift ring resonator based on Evanescent-Field (EF) interaction with surrounding analytes in H2O/IPA environment. Several factors such as Sensitivity, Q-factor, Extinction ratio (ER), Intrinsic limit of detection (ILOD) and detection range will be observed in deciding the performance of the micro-ring resonator. The structure of the resonator make use of Liquid-Si3N4-SiO2(BOX) with Si3N4 thickness<400nm with TE single-mode condition. Optimizations will be done by changing surrounding environment and dimension of ring resonator to obtain better performance. Some of the parameters are given such as Q-factor > 5k, ER > 10 dB and Free Spectral Range (FSR) = 10nm working at wavelength of 2µm. The highest sensitivity achieved as high as 465.11 nm/RIU with Q-factor of 12152.7 and detection range of 0.23-14.2% (Glucose) accuracy (Using IPA upper cladding). Power Splitter was also investigated to allow multiple measurement (with a reference) to be done at one time. Further, investigation on slab waveguide vs double slot waveguide on Mach-Zehnder Interferometer has been investigated achieving 2061.9π/RIU (For sensing length of 4582 µm) with detection range of 0.0028-0.566%.