Interaction of Surface Acoustic Waves with Organic Semiconductor and its Applications

Abstract

With the introduction of the concept of surface acoustic wave (SAW) by Lord Rayleigh in 1885 and after the advent of the interdigital transducer (IDT) in 1965, the propagation of SAW has been widely studied in piezoelectric based devices. A SAW device provides multitude of signal processing and frequency response related attributes, depending on the geometry of the IDTs deposited and on the properties of the piezoelectric substrate. SAW based signal processing units such as filters, oscillators, convolvers, correlators, matched filters etc. find their applications in radar systems, TV receivers, digital radio, spread-spectrum communications, electronic counter-measures, air traffic control and data-handling systems. SAW devices have also been used for sensing pressure, humidity, temperature, as well as bio and chemical analytes by analyzing the respective change in the SAW propagation parameters.