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Characterization and optimization of photonic crystal fiber evanescent wave sensor for gas explosives detection in terahertz wave

HU HAI-YAN1, REN GUANG-JUN1,* , WANG PENG-YU2, YAO JIAN-QUAN3

Affiliation

  1. School of Electronics Information Engineering; Tianjin Key Lab. Of Film Electronic & Communication Devices; Engineering Research Center of Communication Devices and Technology, Ministry of Education;
  2. Zhonghuan Information College Tianjin University of Technology Tianjin 300380, PR China
  3. College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics; Key Laboratory of Optoelectric Information Science and Technology, Ministry of Education, Ti

Abstract

Some gas explosives spectrum resonance absorption peaks is in terahertz wave, the relative sensitivity of evanescent wave solid core PCF sensor used for their sensing detection is simulated and calculated by finite element method (FEM). The relative sensitivity of PCF increases rapidly with the growth of operating wavelength, for the same operating wavelength, the larger the cladding d/λ is, the higher the relative sensitivity is. Moreover, the relative sensitivity of several different fiber core structure PCF is also compared when d/λ is set be 0.8, the relative sensitivity will increase with both the fiber core holes number and holes radius increase in the premise of not changing guide light principle. By simulating, the symmetric fiber core nine holes arranged square lattice PCF what holes radius is 50μm is the best choice for sensing detection application..

Keywords

Explosives, Terahertz wave, Evanescent wave, Photonic crystal fiber.

Submitted at: May 4, 2011
Accepted at: Sept. 20, 2012

Citation

HU HAI-YAN, REN GUANG-JUN, WANG PENG-YU, YAO JIAN-QUAN, Characterization and optimization of photonic crystal fiber evanescent wave sensor for gas explosives detection in terahertz wave, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 9-10, pp. 722-726 (2012)