Quantitative, high-throughput, real-time, and label-free biomolecular detection (DNA, protein, etc.) on SiO2 surfaces can be achieved using a simple interferometric technique which relies on LED illumination, minimal optical components, and a camera. The Interferometric Reflectance Imaging Sensor (IRIS) is inexpensive, simple to use, and amenable to microarray formats.
Lopez, C. A., Daaboul, G. G., Ahn, S., Reddington, A. P., Monroe, M. R., Zhang, X., Irani, R. J., Yu, C., Genco, C. A., Cretich, M., Chiari, M., Goldberg, B. B., Connor, J. H., Ünlü, M. S. Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS). J. Vis. Exp. (51), e2694, doi:10.3791/2694 (2011).