Terahertz wave sensing applications using the evanescent field of a plastic wire waveguide

• Main Authors: Wan-LingTseng, 曾琬玲
• Other Authors: Ja-yu Lu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/a36jr6

碩士 === 國立成功大學 === 光電科學與工程學系 === 107 === The thesis successfully demonstrates a plastic-wire terahertz (THz) waveguide is workable for sensing the minute molecules. The experimental observation first illustrates the relation between dielectric core geometry and the waveguide spectrum. The sample substrate with nano-porous structure is then revealed as the critical element of the waveguide sensing configuration. Based on the sensitivity calibration with the standard sample of DPBS (Dulbecco's Phosphate-Buffered Saline), various porous substrates are discussed for their sensing abilities while being integrated with evanescent waves of a plastic-wire waveguide. The sensitivity of substrate-integrated plastic wire sensor is also compared with the ribbon waveguides with the porous structures in the study. For the same waveguide frequency and minute amounts of sample, the sensitivity of substrate-integrated plastic wire sensor is higher than that of a ribbon waveguide sensor. Based on the optimal geometry of substrate-integrated plastic-wire sensor, molecules in particles and drops can be recognized from different waveguide properties of the sample substrate, including the spectral shift of transmittance dip (or attenuation peak), attenuation coefficient variation at 0.3 THz, and the variation of effective waveguide refractive indices or attenuation coefficients.