Demonstration of using surface plasma enhanced magneto-optic Kerr effect to implement a compact micro-optofluidic sensor

A high-sensitivity biosensor is demonstrated by exploiting surface plasma (SP) enhanced transverse magneto-optical Kerr effect (TMOKE) on a packaged micro-optofluidic chip to implement a compact system for detecting chemical or biological objects. The SP grating made on a composite Au/Fe/Au layer exhibits a very dispersive Kerr parameter variation near the SP resonance wavelength. A preliminary experimental result on studying avidin-biotin interaction shows the sensitivity of avidin detection in PBS solution is about 31 nM.