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Proceedings Paper

A fluid sensor based on a sub-terahertz photonic crystal waveguide
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Paper Abstract

We present two-dimensional photonic-crystal waveguides for fluid-sensing applications in the sub-terahertz range. The structures are produced using a standard machining processes and are characterized in the frequency range from 67 to 110 GHz using a vector network analyzer. The photonic crystal consists of an air-hole array drilled into a high-density polyethylene block. A waveguide is introduced by reducing the diameter of the holes in one row. The holes can be loaded with liquid samples. For all structures we observe photonic band gaps between 97 and 109 GHz. While the pure photonic crystal shows the deepest stop band (28 dB), its depth is reduced by 5 dB when inserting a waveguiding structure. The depth of the photonic band gap is further reduced by several decibels depending on the refractive index of the liquid that is inserted. With this type of fluid sensor we can clearly distinguish between cyclohexane and tetrachloromethane with refractive indices of 1.42 and 1.51, respectively. The results are in good agreement with theoretical calculations based on the 2D finite-difference time-domain (FDTD) method.

Paper Details

Date Published: 3 February 2007
PDF: 8 pages
Proc. SPIE 6480, Photonic Crystal Materials and Devices VI, 64801I (3 February 2007); doi: 10.1117/12.708481
Show Author Affiliations
T. Hasek, Technische Univ. Braunschweig (Germany)
H. Kurt, Georgia Institute of Technology (United States)
D. S. Citrin, Georgia Institute of Technology (United States)
Technische Univ. Braunschweig (Germany)
M. Koch, Technische Univ. Braunschweig (Germany)


Published in SPIE Proceedings Vol. 6480:
Photonic Crystal Materials and Devices VI
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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