We have succeeded in designing a one-dimensional two-way unidirectional acoustic filter in the linear regime for the first time by combining the concept of functionally graded phononics and the free vibration characteristic of a finite-sized phononic structure. Such a design also enables the realization of a truly one-dimensional and linear bi-directional acoustic diode. The key to this design is to locate a natural frequency precisely in a band gap, and we show theoretically here that this frequency should be associated with an edge mode. The efficiency of the acoustic diode is also discussed and optimized.
Weiqiu Chen, Yang Huang, and Yingjie Chen, "One-dimensional linear bi-directional acoustic diodes: design principle and optimization (Conference Presentation)," Proc. SPIE 10600, Health Monitoring of Structural and Biological Systems XII, 1060016 (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 07, 2018; Published: 3 April 2018); https://doi.org/10.1117/12.2294958.5763088367001.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon