Europhys. Lett.
Volume 70, Number 2, April 2005
Page(s) 197 - 203
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 23 March 2005
Europhys. Lett., 70 (2), pp. 197-203 (2005)
DOI: 10.1209/epl/i2004-10479-7

Y-shaped beam splitters for self-collimated beams in 2D photonic crystals

Yao Peijun1, Chen Bo1, Zhang Jiangying1, Chen Xiyao2, Wang Pei1 and Ming Hai1

1  Department of Physics, University of Science and Technology of China Hefei 230026, PRC
2  Department of Physics and Electronic Information Engineering Minjiang University - Fuzhou 350011, PRC

received 28 October 2004; accepted in final form 24 February 2005
published online 23 March 2005

In this paper, a new Y-shaped beam splitter is designed by combining the partial band gap with self-collimation in a two-dimensional photonic crystal, and the design has been validated by finite-difference time-domain simulation. Simultaneously, we improve the design and enhance the power transmission ratio by inserting an air trench into the incident waveguide. The transmission rises from 24% to 44% at the normalized frequency of 0.185 in each branch, and the maximum transmission ratio within the frequency range of self-collimation reaches 47% at the normalized frequency of 0.187.

42.79.Fm - Reflectors, beam splitters, and deflectors.
42.70.Qs - Photonic bandgap materials.
41.85.Si - Beam collimators, monochromators.

© EDP Sciences 2005