Kaloudis Emmanouil Kaniolakis, Kaleris Konstantinos, Aravantinos-Zafiris Nikos, Sigalas Michael, Katerelos Dionysios T G, Dimitriou Vasilis, Bakarezos Makis, Tatarakis Michael, Papadogiannis Nektarios A
Institute of Plasma Physics and Lasers (IPPL), Hellenic Mediterranean University, Tria Monastiria, GR-74100 Rethymnon, Greece.
Physical Acoustics and Optoacoustics Laboratory, Department of Music Technology and Acoustics, Hellenic Mediterranean University, GR-74100 Rethymnon, Greece.
Materials (Basel). 2025 Mar 12;18(6):1251. doi: 10.3390/ma18061251.
Acoustic metamaterials and phononic crystals are progressively consolidating as an important technology that is expected to significantly impact the science and industry of acoustics in the coming years. In this work, the impact of unit cell multiplicity on the spectral features of the acoustic response of phononic crystals is systematically studied using the recently demonstrated laser-plasma sound source characterization method. Specifically, by exploiting the advantages of this method, the impact of the number of repeated unit cells on the depth of the phononic band gaps and the passband spectral features across the entire audible range is demonstrated. These experimental findings are supported by specially developed computational simulations accounting for the precise structural characteristics of the studied phononic crystals and are analysed to provide a phenomenological understanding of the underlying physical mechanism. It is shown that by increasing the unit cell multiplicity, the bandgaps deepen and the number of resonant peaks in the crystal transmission zones increases. The resonant mode shapes are computationally investigated and interpreted in terms of spherical harmonics. This study highlights the tunability and design flexibility of acoustic components using phononic crystals, opening new paths towards applications in the fields of sound control and noise insulation.
声学超材料和声子晶体正逐渐巩固成为一项重要技术，预计在未来几年将对声学科学和产业产生重大影响。在这项工作中，使用最近展示的激光等离子体声源表征方法，系统地研究了晶胞多重性对声子晶体声学响应光谱特征的影响。具体而言，通过利用该方法的优势，证明了重复晶胞数量对声子带隙深度和整个可听范围内通带光谱特征的影响。这些实验结果得到了专门开发的考虑所研究声子晶体精确结构特征的计算模拟的支持，并进行了分析以提供对潜在物理机制的现象学理解。结果表明，通过增加晶胞多重性，带隙会加深，晶体传输区域中的共振峰数量会增加。通过计算研究共振模式形状，并根据球谐函数进行解释。这项研究突出了使用声子晶体的声学组件的可调谐性和设计灵活性，为声音控制和隔音领域的应用开辟了新途径。
