1C.Qiu,Z.Liu,J.Shi,and C.T.Chan,Directional acoustic source based on the resonant cavity of two-dimensional phononic crystals,Appl.Phys.Lett,2005,86,224105.
2C.Qiu and Z.Liu,Acoustic directional radiation and enhancement caused by band-edge states of two-dimensional phononic crystals,Appl.Phys.Lett,2006,89,063106.
3Z.He,Y.Heng,S.Peng,Y.Ding,M.Ke,and Z.Liu,Acoustic collimating beams by negative refraction in twodimensional phononic crystal,J.Appl.Phys,2009,105,116105.
4Z.He,K.Deng,H.Zhao,and X.Li,Designable hybrid sonic crystals for transportation and division of acoustic images,Appl.Phys.Lett,2012,101,243510.