基于无源奇偶时间对称的声学多功能逻辑门和放大器
Acoustic Multifunctional Logic Gates and Amplifier based on Passive Parity-Time Symmetry
摘要：
声学模拟计算和信号处理具有重要的意义，但由于其功能单一、结构复杂，使得声学计算器件的实现具有挑战性。在本文中，声学多功能器件，它可以门或放大声波，而不诉诸改变频率和结构，使用被动声宇称时间（PT）对称的超材料，理论和实验实现。超材料由五个无损耗周期性分布介质构成，这些介质被调制以实现无源PT对称性。在PT对称相位破缺的相干完全吸收体（CPA）-发射体点处，通过调节两束入射光的相位差和幅值差，在一个系统中实现了逻辑门（AND、OR、XOR和NOT）和小信号放大器。该研究为PT对称性与声学超材料的结合提供了一条新的途径，在声学调制和声学多功能器件方面具有巨大的应用潜力。
英文摘要：
Acoustic analogue computation and signal processing are of great significance, however, it's challenging to realize the acoustic computing devices because of their limitations of single function and complex structure. In this paper, an acoustic multifunctional device, which can gate or amplify acoustic waves without resorting to altering the frequency and structure using a passive acoustic parity-time (PT)-symmetric metamaterial, is realized theoretically and experimentally. The metamaterial is constructed by five lossless-loss periodically distributed media which are modulated to achieve the passive PT symmetry. At the coherent perfect absorber (CPA)-emitter point in the broken PT-symmetric phase, the logic gates (AND, OR, XOR and NOT) and small signal amplifier are realized in a single system by adjusting the phase and amplitude differences between two incoming beams, respectively. This work provides a new route for the connection between the PT symmetry and the acoustic metamaterial, which has great potential applications in acoustic modulation and acoustic multifunctional device.
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