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