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Proceedings Paper

Tunable Mach-Zehnder interferometer in a two-dimensional photonic crystal with liquid crystal infiltration
Author(s): Xiyao Chen; Xinyong Dong; Juan Juan Hu; Ping Shum; Yufei Wang; Yishen Qiu; Guimin Lin; Hailian Hong
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Paper Abstract

A theoretical model of a tunable Mach-Zehnder interferometer (TMZI) constructed in a 2D photonic crystal is proposed. The 2D PhC consists of a square lattice of cylindric air holes in silicon. The TMZI includes two mirrors and two splitters. Lights propagate between them employing self-collimation effect. The two interferometer branches have different path lengths. Parts of the longer branch are infiltrated with a kind of liquid crystal (LC) whose ordinary and extraordinary refractive indices are 1.522 and 1.706, respectively. The transmission spectra at two MZI output ports are in the shape of sinusoidal curves and have a uniform peak spacing 0.0017c/a in the frequency range from 0.26c/a to 0.27c/a. When the effective refractive index neff of the liquid crystal is increased from 1.522 to 1.706, the peaks shift to the lower frequencies over 0.0017c/a while the peak spacing is almost kept unchanged. So this TMZI can work as a tunble power splitter or an optical switch. For the central operating wavelength around 1550nm, its dimensions are only about tens of microns. So this device may be applied to photonic integrated circuits.

Paper Details

Date Published: 8 October 2007
PDF: 7 pages
Proc. SPIE 6767, Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III, 676709 (8 October 2007); doi: 10.1117/12.743165
Show Author Affiliations
Xiyao Chen, Minjiang Univ. (China)
Xinyong Dong, Hong Kong Polytechnic Univ. (Hong Kong China)
Juan Juan Hu, Nanyang Technological Univ. (Singapore)
Ping Shum, Nanyang Technological Univ. (Singapore)
Yufei Wang, Fujian Normal Univ. (China)
Yishen Qiu, Fujian Normal Univ. (China)
Guimin Lin, Minjiang Univ. (China)
Hailian Hong, Fujian Normal Univ. (China)

Published in SPIE Proceedings Vol. 6767:
Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
Henry H. Du; Hiroshi Fudouzi, Editor(s)

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