Abstract
A two-dimensional triangular lattice solid/fluid phononic crystal (PnC) is proposed as a sensitive biosensor to detect the temperature of the Methyl Nonafluorobutyl Ether (MNE) in the range of 10–40 °C. Temperature changes in MNE represent an important issue for its various applications. Indeed, the MNE is widely used in cosmetic and beauty products for its non-toxic, non-flammable, and colorless chemical properties. For this purpose, a sensitive biosensor for temperature and physical properties of MNE appears necessary. The PnC biosensor consists of a triangular lattice of tungsten cylinders embedded in an epoxy background inside of which a line of hollow cylinders filled with MNE is introduced as a waveguide for guiding resonant modes with low group velocity. We show that the PnC biosensor provides sharp guided modes in the bandgap with high quality factors and frequencies depending on the MNE temperature with high sensitivity. The introduction of damping inside the liquid shows that the shear viscosity, compared to longitudinal, affects drastically the amplitude of the resonant peaks. However, the length of the waveguide can be adapted so as to recover the resonant peak in the presence of viscosities.
Highlights
The technological progress of biosensors for various utilizations has been observed in many fields: petrochemicals, pharmaceutical production, and further water and air pollutant detection.1–4 Recently, the ability to realize a sensor based on its acoustic properties attracts attention
We aim to propose here a linear defect constituted by a line of hollow cylinders containing the Methyl Nonafluorobutyl Ether (MNE) fluid and look for guiding modes of low group velocity, traveling along the waveguide
We developed a two-dimensional phononic crystal sensor to detect the sensitivity of the Methyl Nonafluorobutyl Ether (MNE) acoustic properties with the temperature
Summary
In the acoustic metamaterial topic, Jin et al reported on a phononic crystal plate with hollow pillars filled with a liquid and discussed the behaviors of whispering gallery modes for the purpose of temperature sensing.. Amoudache et al. presented theoretically the dual photonic/phononic or phoxonic platform containing a fluid for sensing the optical and acoustic properties of biochemical liquids. The aim of this paper is to design a phononic crystal sensor able to detect the smallest changes in the acoustic properties and temperature of MNE based on the transmission of highly confined modes that relate to the acoustic properties of MNE. The waveguide is constituted by hollow cylinders that will be filled with MNE Based on this phononic platform, we aim to demonstrate the efficiency of the temperature detection of the viscous liquid MNE, dealing with guiding modes of low group velocities
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