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Phononic bandgaps of Parylene-C microfibrous thin films (muFTFs) werecomputationally determined by treating them as phononic crystals comprisingidentical microfibers arranged either on a square or a hexagonal lattice. Themicrofibers could be columnar,chevronic, or helical in shape, and the hostmedium could be either water or air. All bandgaps were observed to lie in the0.01-to-162.9-MHz regime, for microfibers of realistically chosen dimensions.The upper limit of the frequency of bandgaps was the highest for the columnarmuFTF and the lowest for the chiral muFTF. More bandgaps exist when the hostmedium is water than air. Complete bandgaps were observed for the columnarmuFTF with microfibers arranged on a hexagonal lattice in air, the chevronicmuFTF with microfibers arranged on a square lattice in water, and the chiralmuFTF with microfibers arranged on a hexagonal lattice in either air or water.The softness of the Parylene-C muFTFs makes them mechanically tunable, andtheir bandgaps can be exploited in multiband ultrasonic filters.

Parylene-C microfibrous thin films as phononic crystals