3-D Multifunctional Sensors Fabricated on Fiber Tips Using a Two-Photon Polymerization Process
Abstract
This thesis conducts research involving designing, fabricating, and testing optical fiber tip refractive index sensors. The fabrication process used for these sensors is a two-photon polymerization process utilizing a photo sensitive polymer. Unlike planar lithography, this fabrication process allows the creation of arbitrary shapes with a great degree of freedom. There is a total of three different designed fiber tip sensors that are all fabricated and tested. One is a flat surfaced single cavity Fabry-Prot interferometer (FPI) device, another is a flat surfaced double cavity FPI device, and the last is a confocal surfaced double cavity FPI device. These sensors are tested for both thermal radiation and volatile organic compounds (VOC) sensing. Thermal radiation sensing involves exposing the device to temperatures ranging from room temperature up to 120 deg C. As the temperature increases the fiber tip structure expands which changes its reflection spectrum. Each device was also exposed to isopropanol in gaseous form which results in a refractive index change. This change is also observed in the reflection spectrum. Lastly, research was conducted on thin dielectric reflective coatings for the purpose of increasing the reflectivity of the device surfaces resulting in a higher quality factor.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2019
- Accession Number
- AD1076438
Entities
People
- Jonathan W. Smith
Organizations
- Air Force Institute of Technology