The present invention is directed to an optical grating sensor configured to detect a phase change in light passing though the system due to a binding event caused by an analyte. The grating sensor may include a light source that may be, for example, a coherent light source. The invention may also include...http://www.google.com.hk/patents/US7445938?utm_source=gb-gplus-share專利 US7445938 - System and method for detecting presence of analytes using gratings
