Y-shaped beam splitters for self-collimated beams in 2D photonic crystals Yao Peijun, Chen Bo, Zhang Jiangying, Chen Xiyao, Wang Pei and Ming Hai Europhys. Lett., 70 2 (2005) 197-203 Published online: 23 March 2005 DOI: 10.1209/epl/i2004-10479-7