Abstract
A method for the detection of ultrasonic vibrations using the apertureless near-field scanning optical microscope (ANSOM) is presented. Due to the changes in tip-sample separation, ultrasonic vibrations are seen as perturbations on the near-field signal. Both contact transducer (5 MHz) and laser-generated ultrasound have been successfully transduced. The linear dependence of the near-field signal on tip-sample separation makes the interpretation of these wave forms similar to that for conventional ultrasonic techniques.
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