Title: Parylene-C microfibrous thin films as phononic crystals,
Abstract: Phononic bandgaps of Parylene-C microfibrous thin films (muFTFs) 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-to-162.9-MHz regime, for microfibers of realistically chosen dimensions.
The upper limit of the frequency of bandgaps was the highest for the columnar
muFTF and the lowest for the chiral muFTF. More bandgaps exist when the host
medium is water than air. Complete bandgaps were observed for the columnar
muFTF with microfibers arranged on a hexagonal lattice in air, the chevronic
muFTF with microfibers arranged on a square lattice in water, and the chiral
muFTF with microfibers arranged on a hexagonal lattice in either air or water.
The softness of the Parylene-C muFTFs makes them mechanically tunable, and
their bandgaps can be exploited in multiband ultrasonic filters.