PT-Symmetric Acoustics

被引：537

作者：

Zhu, Xuefeng ^{[1
]}

Ramezani, Hamidreza ^{[1
]}

Shi, Chengzhi ^{[1
]}

Zhu, Jie ^{[1
]}

Zhang, Xiang ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW X | 2014年 / 4卷 / 03期

关键词：

METAMATERIALS; OPTICS;

D O I：

10.1103/PhysRevX.4.031042

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We introduce here the concept of acoustic parity-time (PT) symmetry and demonstrate the extraordinary scattering characteristics of the acoustic PT medium. On the basis of exact calculations, we show how an acoustic PT-symmetric medium can become unidirectionally transparent at given frequencies. Combining such a PT-symmetric medium with transformation acoustics, we design two-dimensional symmetric acoustic cloaks that are unidirectionally invisible in a prescribed direction. Our results open new possibilities for designing functional acoustic devices with directional responses.

引用

页数：7

共 53 条

[1] Real spectra in non-Hermitian Hamiltonians having PT symmetry [J].

Bender, CM ;

Boettcher, S .

PHYSICAL REVIEW LETTERS, 1998, 80 (24) :5243-5246

[2] Observation of Asymmetric Transport in Structures with Active Nonlinearities [J].

Bender, N. ;

Factor, S. ;

Bodyfelt, J. D. ;

Ramezani, H. ;

Christodoulides, D. N. ;

Ellis, F. M. ;

Kottos, T. .

PHYSICAL REVIEW LETTERS, 2013, 110 (23)

[3]

Boechler N, 2011, NAT MATER, V10, P665, DOI [10.1038/nmat3072, 10.1038/NMAT3072]

[4] Resonance effects in broadband acoustic cloak with multilayered homogeneous isotropic materials [J].

Cheng, Y. ;

Liu, X. J. .

APPLIED PHYSICS LETTERS, 2008, 93 (07)

[5] PT-Symmetry Breaking and Laser-Absorber Modes in Optical Scattering Systems [J].

Chong, Y. D. ;

Ge, Li ;

Stone, A. Douglas .

PHYSICAL REVIEW LETTERS, 2011, 106 (09)

[6] Coherent Perfect Absorbers: Time-Reversed Lasers [J].

Chong, Y. D. ;

Ge, Li ;

Cao, Hui ;

Stone, A. D. .

PHYSICAL REVIEW LETTERS, 2010, 105 (05)

[7] Theory of resonant acoustic transmission through subwavelength apertures [J].

Christensen, J. ;

Martin-Moreno, L. ;

Garcia-Vidal, F. J. .

PHYSICAL REVIEW LETTERS, 2008, 101 (01)

[8] RESONANT SCATTERING AND ANDERSON LOCALIZATION OF ACOUSTIC-WAVES [J].

CONDAT, CA ;

KIRKPATRICK, TR .

PHYSICAL REVIEW B, 1987, 36 (13) :6782-6793

[9] Overcoming the diffraction limit in wave physics using a time-reversal mirror and a novel acoustic sink [J].

de Rosny, J ;

Fink, M .

PHYSICAL REVIEW LETTERS, 2002, 89 (12) :124301-124301

[10] Ultrasonic metamaterials with negative modulus [J].

Fang, Nicholas ;

Xi, Dongjuan ;

Xu, Jianyi ;

Ambati, Muralidhar ;

Srituravanich, Werayut ;

Sun, Cheng ;

Zhang, Xiang .

NATURE MATERIALS, 2006, 5 (06) :452-456

← 1 2 3 4 5 6 →