Magnetostriction active elements of solid-state ultrasonic devices on the base of parametrical out-of-threshold processes

Solid-state parametrical elements of the ultrasound wave front transformation (WFT) are considered in the paper aiming at the out-of-threshold process investigation of the sound wave front transformation in magnetoordered dielectrics. The development of solid-state active elements of parametrical ultrasonic devices is also the aim of the paper. As a result a model of a transition process of the out-of-threshold transformation of a sound wave front under conditions of the non-linear restriction has been obtained for the first time. Frequency properties of the WFT out-of-threshold regime have been investigated. Solid-state elements of WFT from polycrystalline ferrite have been elaborated. A non-stationary process of WFT with the amplification to 116 dB and loudness has been obtained and investigated. The signal time transformation in elements from hematite has been obtained. The angular non-uniformity of the longitudinal wave amplification in elements from ferrite has been investigated. The construction has been created and the WFT device pattern on the base of active elements fom ferrite has been made. Main calculation relations have been represented. Results of pattern tests have been obtained. The increase of the WFT device effectiveness (the increase of amplification, loudness on the output of an active element, the possibility of the work with longitudinal waves and waves with a wide angular spectrum) is the result of the introduction. The paper results may find their field of application in acoustoelectronics, acoustoscopy, defectoscopy, ultrasonic diagnosticsAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

A Biosensor Based on Bound States in the Continuum and Fano Resonances in a Solid–Liquid–Solid Triple Layer

We propose a simple solid–liquid–solid triple layer biosensor platform based on bound states in the continuum (BICs) and Fano resonances to detect the acoustic properties of liquids and apply the method to a mixture of water and albumin with various concentrations. The solid–liquid–solid triple layer is composed of an epoxy as a solid layer and an albumin–water mixture as a liquid layer, and the entire system is immersed in water. In this work, we show that the structure exhibits a high sensitivity (S), quality factor (Q), and figure of merit (FOM) with a better detection limit (DL) in the vicinity of the BICs where the transmission spectra exhibit Fano resonances. The Fano resonances shift towards high frequencies as the concentration increases. The detection limit can reach very small values for a small albumin concentration (4.7%). In addition, for a given concentration and layer thickness of the sensing material, we show the effect of the incidence angle on the efficiency of the sensor in terms of the sensitivity and quality factor. The proposed structure can be designed from low-cost material and can be used as a sensor to detect different types of liquids and gases as well

A Biosensor Based on Bound States in the Continuum and Fano Resonances in a Solid–Liquid–Solid Triple Layer

We propose a simple solid–liquid–solid triple layer biosensor platform based on bound states in the continuum (BICs) and Fano resonances to detect the acoustic properties of liquids and apply the method to a mixture of water and albumin with various concentrations. The solid–liquid–solid triple layer is composed of an epoxy as a solid layer and an albumin–water mixture as a liquid layer, and the entire system is immersed in water. In this work, we show that the structure exhibits a high sensitivity (S), quality factor (Q), and figure of merit (FOM) with a better detection limit (DL) in the vicinity of the BICs where the transmission spectra exhibit Fano resonances. The Fano resonances shift towards high frequencies as the concentration increases. The detection limit can reach very small values for a small albumin concentration (4.7%). In addition, for a given concentration and layer thickness of the sensing material, we show the effect of the incidence angle on the efficiency of the sensor in terms of the sensitivity and quality factor. The proposed structure can be designed from low-cost material and can be used as a sensor to detect different types of liquids and gases as well