Acoustic Diode: Rectification of Acoustic Energy Flux in One-Dimensional Systems

Liang, Bin; Yuan, Bo; Cheng, Jianchun

doi:10.1103/physrevlett.103.104301

Cited by 551 publications

(361 citation statements)

References 10 publications

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“…When the input end is changed, ω is outside of Line b's passband, and the fundamental wave decays exponentially, which prevents energy flux through the interface. This is very similar to Liang et al's acoustic diode [8] in principle.…”

Section: Simulationsupporting

confidence: 72%

Asymmetric energy flow in coupled nonlinear LC transmission line

Chen

Feng

et al. 2011

Chin. Sci. Bull.

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We constructed a coupled LC transmission line and studied the propagation of waves in it. We found asymmetric energy flow when we changed the driving conditions at the boundary. We analyzed this change and believe that it occurs because of the bandpass characteristics of the LC transmission line and high-order harmonic waves induced by nonlinearities. The LC transmission line could be used to simulate a microscopic crystal lattice. Therefore, we hope to observe thermal rectification in the system. We investigated the dependence of the system on different parameters, and then discussed the multi-frequency condition to aid in experimental verification. For numerical simulations of a coupled 1D lattice, it has been found that energy can flow through the channel from the high-temperature thermal bath to the lower-temperature bath in one direction. However, the lattice behaves as an insulator if the thermal baths are swapped. An experiment using a nanotube has shown this behavior with a 7% difference between heat fluxes in the two opposite directions [3]. However, nanotubes are not strictly 1D lattices in reality. In fact, we should be able to observe this abnormal phenomenon in experiments based on a macroscopic 1D lattice, which has the similar governing equations as the microscopic crystal lattice. In a macroscopic system, the energy of vibration (phonon) of each lattice can be measured directly. There are many types of macroscopic 1D lattice models, for example, pendulum chains [4] and nonlinear LC transmission lines [5]. While taking into account effect of thermal baths, we used the LC transmission line as our investigation model. The realization of random vibrations is much simpler to achieve with an electrical signal than in a mechanical system. In this work, we present a study of the propagation of waves in two coupled LC transmission lines, in which one line exhibits nonlinear transmission [5] and the other line is linear. First, we investigated monofrequency driving through numerical simulation and looked for possible abnormal energy transmission. Then we further discus multi-frequency driving (thermal bath) to aid ensuring experimental realization. Coupled LC transmission lineThe coupled LC transmission line that we studied contains two sub-lines (Lines a and b), which have the same structure but different parameters. They are coupled by an inductor, L int . This is shown in Figure 1. Each cell of the transmission lines has the usual form [6], which consists of one capacitor and two inductors. In Line a, the capacitor is nonlinear. A variable capacitance diode, BB112, working at a DC voltage near V d =2.0 V, serves as the nonlinear capacitor. If |V n |<2.0 V, the capacitance is related to the AC voltage V n as follows [6]:

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Section: Simulationsupporting

confidence: 72%

Asymmetric energy flow in coupled nonlinear LC transmission line

Chen

Feng

et al. 2011

Chin. Sci. Bull.

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“…Recent advancements in man-made materials ("metamaterials") have resulted in intriguing achievements in acoustic and phononic transport manipulation [1]. These discoveries include dynamic negative density and a bulk modulus [2][3][4][5][6][7][8], subwavelength imaging [9][10][11], acoustic and surface wave cloaking [12][13][14][15], a phononic band gap [16,17], extraordinary acoustic transmission [18,19], Anderson localization [20], and asymmetric transmission [21][22][23][24][25]. These works, so far, are based on the modulation of the real part of the acoustic parameters.…”

Section: Introductionmentioning

confidence: 99%

PT-Symmetric Acoustics

et al. 2014

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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.

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“…Large acoustic isolation has been obtained using option (i) in a non-linear medium paired with a frequency selective mirror [8,9], or with the help of nonlinear acoustic inclusions [10]; however, all these nonlinear solutions typically introduce severe signal distortions and only work for large acoustic intensities. According to the Casimir-Onsager principle of microscopic reversibility [11], linear isolation is possible if the system is biased with an odd-vector upon time reversal, just like the static magnetic field in the case of the Faraday isolator [option (ii)].…”

Section: Introductionmentioning

confidence: 99%