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A novel composite waveguide is proposed to improve the directional emission of phononic crystal waveguide by introducing a point defect array. The finite element simulations indicate that the point defects attached to the output surface of phononic crystal waveguide produce resonant modes, which act as secondary radiation sources. The interferences of sound wave radiated from these radiation sources and waveguide can enhance the normal radiation intensity by 161.21% and reduce the half-power angular width by 85.35%. In addition, when the number of the point defects is large enough, the directivity approaches a steady value. The investigation provides a new method to improve the directional emission of phononic crystal waveguide.
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Keywords:
- phononic crystal waveguide /
- point defect /
- resonant mode /
- directional emission
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[21] [22] Zhu Z H, Ye W M, Ji J R, Yuan X D, Zen C 2007 Appl. Phys. B 86 327
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[28] Zhao D G, Liu Z Y, Qiu C Y, He Z J, Cai F Y, Ke M Z 2007 Phys. Rev. B 76 144301
[29] [30] Jia H, Ke M Z, He Z J, Peng S S, Liu G Q, Mei X F, Liu Z Y 2009 J. Appl. Phys. 106 044512
[31] -
[1] Kushwaha M S, Halevi P, Dobrzynski L, Djafari-Rouhani B 1993 Phys. Rev. Lett. 71 2022
[2] [3] Martinezsala R, Sancho J, Sanchez J V, Gomez V, Llinares J, Meseguer F 1995 Nature 378 241
[4] Wen J H, Wang G, Yu D L, Zhao H G, Liu Y Z 2005 J. Appl. Phys. 97 114907
[5] [6] Wang G, Wen J H, Han X Y, Zhao H G 2003 Acta Phys. Sin. 52 1943 (in Chinese) [王 刚、温激鸿、韩小云、赵宏刚 2003 52 1943]
[7] [8] Gao G Q, Ma S L, Jin F, Kim T B, Lu T J 2010 Acta Phys. Sin. 59 393 (in Chinese) [高国钦、马守林、金 峰、金东范、卢天健 2010 59 393]
[9] [10] [11] Sigalas M M 1998 J. Appl. Phys. 84 3026
[12] [13] Kafesaki M, Sigalas M M, Garcia N 2000 Phys. Rev. Lett. 85 4044
[14] Wu F G, Liu Y Y 2002 Acta Phys. Sin. 51 1434 (in Chinese) [吴福根、刘有延 2002 51 1434]
[15] [16] Khelif A, Choujaa A, Djafari-Rouhani B, Wilm M, Ballandras S, Laude V 2003 Phys. Rev. B 68 214301
[17] [18] Bethe H A 1944 Phys. Rev. 66 163
[19] [20] Moreno E, Garcia-Vidal F J, Martin-Moreno L 2004 Phys. Rev. B 69 121402
[21] [22] Zhu Z H, Ye W M, Ji J R, Yuan X D, Zen C 2007 Appl. Phys. B 86 327
[23] [24] [25] Wang Q, Cui Y P, Yan C C, Zhang L L, Zhang J Y 2009 Acta Phys. Sin. 58 1020 (in Chinese) [王 琼、崔一平、闫长春、张玲玲、张家雨 2009 58 1020]
[26] [27] Christensen J, Fernandez-Dominguez A I, De Leon-Perez F, Martin-Moreno L, Garcia-Vidal F J 2007 Nat. Phys. 3 851
[28] Zhao D G, Liu Z Y, Qiu C Y, He Z J, Cai F Y, Ke M Z 2007 Phys. Rev. B 76 144301
[29] [30] Jia H, Ke M Z, He Z J, Peng S S, Liu G Q, Mei X F, Liu Z Y 2009 J. Appl. Phys. 106 044512
[31]
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