Patent ID: 9160299
Filing Date: 2015-10-13
Classification: G01N,H03H

Abstract:
1. An acoustic wave element comprising: a piezoelectric body; an input IDT electrode provided on the piezoelectric body and configured to excite a main acoustic wave; an output IDT electrode provided on the piezoelectric body and configured to output a signal by being configured to receive the main acoustic wave; a propagation path provided between the input IDT electrode and the output IDT electrode; a first dielectric layer provided on the piezoelectric body so as to cover the input IDT electrode and the output IDT electrode; and a reactive portion provided above the propagation path and configured to react to a substance to be detected or a binding substance configured to bind with the substance to be detected, wherein the first dielectric layer has a film thickness equal to or greater than 0.8 times a wavelength of a main acoustic wave, and wherein the main acoustic wave is configured to become, in the input IDT electrode and the output IDT electrode, a boundary acoustic wave that is configured to propagate between the piezoelectric body and the first dielectric layer, and become, in the propagation path, a surface acoustic wave that is configured to propagate on an upper surface of the propagation path.