Adaptive holographic interferometer for detection of microcantilever vibration in liquid environment

Abstract

he sensitive element of micromechanical biosensors is microcantilever. The microcantilever natural frequency depends on the mass of the attached biological objects. The sensitivity of micromechanical biosensors is determined both by the it΄s geometry and by the method of excitation and detection of the microcantilever motions. The paper presents the results of an experimental application of adaptive holographic interferometer based on two wave mixing in photorefractive crystal of CdTe:V for detection of microcantilever vibration in liquid environment. It is shown that the adaptive holographic interferometer is able to effectively detect vibration of microcantilever with size of 210 × 40 × 7 µm3.