Title page for ETD etd-08142006-235542

Type of Document Master's Thesis
Author Zhao, Xin
URN etd-08142006-235542
Title Study of Multimode Extrinsic Fabry-Perot Interferometric Fiber Optic Sensor on Biosensing
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Wang, Anbo Committee Chair
Cooper, Kristie L. Committee Member
Pickrell, Gary R. Committee Member
  • Electrostatic self-assembly (ESA)
  • Fabry-Perot
  • Multimode Fiber Optic Sensors
  • White-light Interferometry
  • Biosensor
Date of Defense 2006-08-01
Availability unrestricted
The electrostatic self-assembly (ESA) method presents an effective application in the field of biosensing due to the uniform nanoscale structure. In previous research, a single mode fiber (SMF) sensor system had been investigated for the thin-film measurement due to the high fringe visibility. However, compared with a SMF sensor system, a multimode fiber (MMF) sensor system is lower-cost and has larger sensing area (the fiber core), providing the potential for higher sensing efficiency.

In this thesis, a multimode fiber-optic sensor has been developed based on extrinsic Fabry-Perot interferometry (EFPI) for the measurement of optical thickness in self-assembled thin film layers as well as for the immunosensing test. The sensor was fabricated by connecting a multimode fiber (MMF) and a silica wafer. A Fabry-Perot cavity was formed by the reflections from the two interfaces of the wafer. The negatively charged silica wafer could be used as the substrate for the thin film immobilization scheme. The sensor is incorporated into the white-light interferometric system. By monitoring the optical cavity length increment, the self-assembled thin film thickness was measured; the immunoreaction between immunoglobulin G (IgG) and anti-IgG was investigated.

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