Abstract
We study theoretically the potentiality of dual phononic-photonic (the so-called phoxonic) crystals for liquid sensing applications. We investigate the existence of well-defined features (peaks or dips) in the transmission spectra of acoustic and optical waves and estimate their sensitivity to the sound and light velocities of the liquid environment. Two different sensors are investigated. In the first one, we study the in-plane transmission through a two-dimensional (2D) crystal made of cylindrical holes in a Si substrate where one row of holes is filled with a liquid. In the second one, the out of plane propagation is investigated when considering the transmission of the incident wave perpendicular to a periodic array of holes in a slab. Such ultra compact structure is shown to be a label-free, affinity-based acoustic and optical nanosensor, useful for biosensing applications in which the amount of analyte can be often limited.
Highlights
Photonic crystals [1, 2] and their acoustic counterpart, the so-called phononic crystals [3] are well-known for their ability to guide, control, and manipulate the propagation of the optic and acoustic waves
Phononic crystals have only been recently proposed as a possible platform for the investigation of the acoustic velocity of a liquid filling the hollow parts of the structure [10, 11]
We investigated the potentiality of an infinite 2D cavity-type phoxonic crystal and a phoxonic plate for sensing the acoustic velocity of a liquid
Summary
Photonic crystals [1, 2] and their acoustic counterpart, the so-called phononic crystals [3] are well-known for their ability to guide, control, and manipulate the propagation of the optic and acoustic waves These properties are mainly related to the possibility of band gaps in their band structure that allow the existence of localized modes and confined optic/acoustic waves. To make a phononic/photonic sensor, one needs to design a structure in which the transmission coefficient displays welldefined features that are very sensitive to the acoustic/optic velocity of the infiltrating liquid. These features should be relatively isolated in frequency in order to allow the sensing of the probed parameter on a sufficiently broad range.
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