Phononic bandgaps of Parylene-C microfibrous thin films (μFTFs) were computationally determined by treating them as phononic crystals comprising identical microfibers arranged either on a square or a hexagonal lattice. The microfibers could be columnar, chevronic, or helical in shape, and the host medium could be either water or air. All bandgaps were observed to lie in the 0.01-162.9-MHz regime, for microfibers of realistically chosen dimensions. The upper limit of the frequency of bandgaps was the highest for the columnar μFTF and the lowest for the chiral μFTF. More bandgaps exist when the host medium is water than air. Complete bandgaps were observed for the columnar μFTF with microfibers arranged on a hexagonal lattice in air, the chevronic μFTF with microfibers arranged on a square lattice in water, and the chiral μFTF with microfibers arranged on a hexagonal lattice in either air or water. The softness of the Parylene-C μFTFs makes them mechanically tunable, and their bandgaps can be exploited in multiband ultrasonic filters.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Mechanics of Materials
- Mechanical Engineering
- Electrical and Electronic Engineering