Microring Resonator Q Factor Improvement through Fabry-Perot Cavity for Biosensing Sensitivity Enhancement.

• Main Authors: Chou-Yun Hsu, 許倬芸
• Other Authors: Shih-Hsiang Hsu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/q33tx2

碩士 === 國立臺灣科技大學 === 電子工程系 === 106 === Biophotonics is a rapidly growing field in prevailing researches and becomes one of the major developed projects of biomedical technology. In recent years, the microring resonator (MRR) has been utilized for label-free biosensing applications. The high quality factor (Q) from the strong electric field enhancement within the ring makes the MRR a good candidate for biomolecule detection under low analyte concentration conditions. Here we propose the MRR interrogated with an interferometry to demonstrate the highest spatial phase sensitivity, which can be derived to a MRR effective length. Since the MRR effective length is proportional to the quality factor Q, the eye-like MRR and sagnac based Fabry-Perot etalon will be implemented to enhance Q factor. Finally, the biosensing resolution can theoretically achieve at least 1.3x10-6 RIU. A broad band source with the fiber communication wavelength range will be utilized for the Mach-Zehnder based optical low coherence interferometry (OLCI) system. Moreover, a two-staged OLCI is intentionally built to demonstrate better spatial phase resolution, interferogram bench mark, and optical ruler for biosensing. In this thesis, the two-staged Mach-Zehnder interferometer and broad band source are utilized to characterize the MRR phenomenon in spatial domains under different concentrations. One advantage for two-staged Mach-Zehnder interferometer is that the bench mark interferograms from the 1st stage can be taken as a reference point during biosensing. Then the different concentrations of the analytes will be analyzed using MATLAB for Gaussian curve fillitng. And the sensitivity and resolution can demonstrate 49 μm⁄μM and 1.53 nM, respectively.