Terahertz subwavelength ribbon waveguide based plasmonic sensors for refractive index and thickness detection

Borwen You, Ja-Yu Lu, Wei Lun Chang, Chin Ping Yu, Tze An Liu, Jin Long Peng

研究成果: Conference contribution

摘要

A terahertz plasmonic waveguide sensor is experimentally demonstrated to utilize surface waves propagated in a onedimension metal grating that constructed on a plastic ribbon waveguide. The grating conformation couples evanescent waves of a subwavelength terahertz waveguide onto the metal surface and highly confines the extended powers within λ/22-range for the phase-matching condition. The confined terahertz waveguiding waves resemble surface plasmonpolaritons but transmit with almost zero dispersion when the coupled surface waves interfere along the metal grating. Based on the dispersion-free guidance, there is Bragg reflection dominated by grating periods and strongly dependent on the refractive index of surface plasmon-polaritions. We successfully detect different thicknesses of polyethylene layers covered on the metal grating with thickness resolution of 1μm when the effective waveguide indices are modified in the vicinity of the metal grating, corresponding to 0.01-index variation. Potentially, terahertz subwavelength ribbon waveguide based plasmonic sensors could be manipulated to detect molecules with extremely low-density or small thickness in the metal-dielectric interface for probing pollution particles and any label-free detection.

原文English
主出版物標題Ultrafast Phenomena and Nanophotonics XVI
DOIs
出版狀態Published - 2012 三月 23
事件Ultrafast Phenomena and Nanophotonics XVI - San Francisco, CA, United States
持續時間: 2012 一月 222012 一月 25

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
8260
ISSN(列印)0277-786X

Other

OtherUltrafast Phenomena and Nanophotonics XVI
國家/地區United States
城市San Francisco, CA
期間12-01-2212-01-25

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程

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