谐振器
多模光纤
平面的
超材料
材料科学
声学
振动
光学
宽带
物理
光电子学
光纤
计算机科学
计算机图形学(图像)
作者
Hayato Takeda,Eikai Murakami,Motonobu Tomoda,Osamu Matsuda,Kentaro Fujita,Oliver B. Wright
摘要
We construct a rainbow metamaterial for multimode sound blocking over a broad range of sub-kHz frequencies in the form of a tapered rectangular cross section beam of machined cells based on elements that can, on average, simultaneously attenuate the majority of the possible elastic-wave polarizations. Using aluminum, we construct a five-cell structure containing sub-wavelength planar resonators with interconnected ribs, which couple to compressional, in-plane shear, flexural, and torsional vibrations. Backed up by numerical simulations, we verify that this tapered structure can, on average, strongly attenuate acoustic modes over the frequency range of the combined metamaterial bandgaps, that is over a frequency range representing ∼50% around ∼0.7 kHz. Applications include vibration isolation.
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