Spectrum analysis of bio-chemical thin films on the surface of a semiconductor by terahertz surface plasmon polaritons
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Key Laboratory for Organic Electronics and Information Display & Institute of Advanced Materials(IAM), Nanjing University of Posts and Telecommunications,Key Laboratory for Organic Electronics and Information Display & Institute of Advanced Materials(IAM), Nanjing University of Posts and Telecommunications,Nanjing university,National Laboratory of Solid State Microstructures, Nanjing University,Nanjing university of posts and telecommunications,Nanjing university of posts and telecommunications

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    Abstract:

    A new method for measuring terahertz (THz) transmission spectra of bio-chemical thin films placed on the surface of a semiconductor by terahertz surface plasmon polaritons (SPPs) was proposed. A strongly confined surface plasmon in the terahertz frequency range on the surface of semiconductor was theoretically proved, which can be used to enhance the light-matter interaction with bio-chemical layers above the semiconductor surface. By employing a free-space THz time-domain spectroscopy (TDS) system, the transmission power spectra of onion epidermis films with free space transmission and SPP transmission, respectively, were experimentally obtained. Experimental results show that SPP transmission spectra represent many characteristic absorption peaks for a layer of onion epidermis film, which are more than 100 times thinner than the free space wavelength of the terahertz wave.

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YANG Tao, XIN Ju-Sheng, ZHU Yong-Yuan, QIN Yi-Qiang, LI Xing-ao, HUANG Wei. Spectrum analysis of bio-chemical thin films on the surface of a semiconductor by terahertz surface plasmon polaritons[J]. Journal of Infrared and Millimeter Waves,2016,35(6):667~671

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History
  • Received:January 13,2016
  • Revised:August 31,2016
  • Adopted:September 05,2016
  • Online: December 06,2016
  • Published: