IMPROVED ACOUSTIC-PLATE-MODE BIOSENSOR

The design of an improved acoustic-plate-mode (APM) biosensor is prese nted. The biosensing element consists of a pair of APM delay lines fab ricated on an ZX lithium niobate (LiNbO3) substrate. Each delay line u tilizes a single APM and exhibits adjacent-mode rejection superior to previous LiNbO3 designs, without sacrificing the high sensitivity to e lectrical effects. The biosensing element is evaluated as an immunosen sor using the vector voltmeter (VVM) measurement system. The results s how that the improved biosensor is capable of selectively detecting an tibody concentrations of 20 ng per ml.