# Parylene-C microfibrous thin films as phononic crystals

## TL;DR

This study computationally investigates Parylene-C microfibrous thin films as phononic crystals, revealing their bandgap properties across various configurations and media, with potential applications in ultrasonic filtering.

## Contribution

It introduces the first detailed analysis of Parylene-C muFTFs as phononic crystals, exploring their bandgap characteristics based on fiber shape, lattice arrangement, and host medium.

## Key findings

- Bandgaps range from 0.01 to 162.9 MHz.
- Complete bandgaps depend on fiber shape, lattice, and medium.
- Microfibers' mechanical tunability enables multiband ultrasonic filters.

## 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.