【摘要】：近年來,新型聲學(xué)器件的發(fā)展迅速,比如聲學(xué)二極管的提出,類比于傳統(tǒng)的電學(xué)二極管,實(shí)現(xiàn)了對(duì)聲波的整流和非互易(或非對(duì)稱)的聲傳播.隨后,聲學(xué)晶體管也被理論上設(shè)計(jì)和提出.作為新型的聲學(xué)概念型設(shè)備,聲學(xué)器件呈現(xiàn)了從簡(jiǎn)單的二端口向三多口甚至多端口的發(fā)展趨勢(shì)(比如聲學(xué)二極管到晶體管).另一方面,聲學(xué)超材料是近10年來的熱門研究話題.利用聲學(xué)超材料的亞波長(zhǎng)共振效應(yīng),可以實(shí)現(xiàn)豐富的功能,包括聲學(xué)斗篷,聲學(xué)幻像,聚焦透鏡,渦旋場(chǎng)和任意波束形成.將超材料單元引入一個(gè)旋轉(zhuǎn)對(duì)稱的多端口系統(tǒng),實(shí)現(xiàn)了無源的復(fù)雜聲學(xué)網(wǎng)絡(luò)中的聲學(xué)路徑操控.證明了當(dāng)超材料提供了打破左右對(duì)稱的附加波矢后,聲學(xué)系統(tǒng)中只允許向右(或向左)傳播.因此實(shí)現(xiàn)了聲波只能逆時(shí)針傳播(或順時(shí)針)的無源聲學(xué)循環(huán)器.解析分析了每個(gè)超材料單元對(duì)聲波的偏轉(zhuǎn)角度來預(yù)測(cè)聲傳播路線.最后,進(jìn)一步將三端口循環(huán)器拓展到更多端口的情況.
[Abstract]:In recent years, the rapid development of new acoustic devices, such as the introduction of acoustic diodes, analog to the traditional electrical diodes, the realization of sound wave rectification and non-reciprocal (or asymmetric) sound propagation. Subsequently, acoustic transistors are also designed and proposed in theory. As a new type of acoustic conceptual equipment, acoustic devices show a trend from simple two-port to three-port or even multi-port (such as acoustic diode to transistor). On the other hand, acoustic metamaterials have been a hot research topic in the last 10 years. By using the subwavelength resonance effect of acoustic supermaterial, we can achieve a wealth of functions, including acoustic cloak, acoustic illusion, focusing lens, vortex field and arbitrary beamforming. The supramaterial element is introduced into a rotationally symmetric multi-port system to realize the acoustic path control in passive complex acoustic networks. It is proved that only the propagation to the right (or to the left) is allowed in the acoustic system when the supermaterial provides additional wave vectors that break the left-left symmetry. Therefore, the passive acoustic circulator which can only propagate counterclockwise (or clockwise) is realized. The deflection angle of each metamaterial element to sound wave is analytically analyzed to predict the propagation path of sound wave. Finally, the three-port circulator is further extended to more ports.
【作者單位】： 南京大學(xué)聲學(xué)研究所;南京大學(xué)微結(jié)構(gòu)與創(chuàng)新協(xié)同中心;
【基金】：國(guó)家973計(jì)劃(2011CB7097900;2012CB921504) 國(guó)家自然科學(xué)基金(11174138;11174139;11222442;81127901)
【分類號(hào)】：TB51

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