Systems and techniques for biomechanical analysis are described. Multiple sensors are used to detect different molecules and/or to analyze multiple samples. A property of the sensors changes in response to a target molecule. The change in the property is detected, which may provide a measure of the concentration of the target molecule.
 The present invention was made with Government support under Grant (Contract) No. R21CA86132-01 awarded by the National Institutes of Health/National Cancer Institute and Contract No. DE-FG03-98ER14870 awarded by the United States Department of Energy. The Government has certain rights to this invention.