Measurements of evanescent wave in a sandwich Lamb wave sensor

Abstract

International audienceOne method for evanescent wave measurement of the Lamb wave biosensor is proposed by putting another Lamb wave device above the first with the distance less than the evanescent field penetration depth in the liquid. The liquid layer is sandwiched with the two Lamb wave devices. The devices are interacted by an evanescent field; thus the evanescent wave can be studied. The mode is split by the interaction of the evanescent wave. The investigation of the evanescent field gives insight into acoustic biosensors and provides precise and multiparameter measurements. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3009562

Orientation dependence of coupling between Lamb and shear horizontal waves in (1-x)Pb(Mg<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf>-xPbTiO<inf>3</inf> single crystal plates

“…Li et al made a Lamb wave device that can detect the evanescent field in liquid by coupling two Lamb wave sensors separated by a distance less than the penetration depth of the evanescent field. The Lamb wave dispersion and the evanescent field characteristics were studied by viewing the coupled output of these sensors [6]. Wingqvist et al designed a micromachined thermally compensated thin film Lamb wave resonator for frequency control and sensing applications.…”

“…In recent years, the application area has been expended to several physical, chemical and biological fields [5][6][7]. Murayama and Mizutani proposed a new type of electromagnetic acoustic transducer (EMAT), which can generate Lamb waves with variable frequencies from 300 kHz to 2.5 MHz.…”