Abstract
With the aim of selecting particular frequencies of interest and rejecting others, the waveguiding and filtering properties of a two-dimensional phononic crystal slab are investigated in the context of a filtering application. To this end, we designed andmanufactured ametallic device that consists of a square lattice of cylindrical pillarsmounted on the top of a plate by using 3Dprinting technology. We respectively explored the theoretical and experimental characteristics of the device by using finite element method, a Micro System Analyzer (MSA) and a scanning laser Doppler vibrometer. The proposed device shows a complete band gap for Lamb wave around 0.3 MHz with a relative band-width of 30%. Tailorable waveguides are realized inside this phononic crystal by inserting several space gaps to achieve a demultiplexing effect through the splitting of an acoustic signal towards three different bandpass frequency channels. The demultiplexing performance has been experimentally demonstrated by achieving rejection levels up to 60 dB. The proposed phononic platform can have a significant impact in signal processing as well as droplet manipulation for biological applications.
Original language | English |
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Article number | 4594 |
Journal | Applied Sciences (Switzerland) |
Volume | 10 |
Issue number | 13 |
DOIs | |
Publication status | Published - 1 Jul 2020 |
Externally published | Yes |
Keywords
- Lamb waves
- Phononic crystal slabs
- Phononic waveguiding
- Wave demultiplexing