title: Application of strong transverse magneto-optical Kerr effect on high sensitive surface plasmon grating sensors.
abstract: A high sensitive sensor is demonstrated by exploiting strong transverse magneto-optical Kerr effect on a ferromagnetic surface plasmon grating. The surface plasmon grating, made of a hybridized Au/Fe/Au layer, exhibits a very dispersive Kerr parameter variation near the surface plasmon polariton (SPP) wavelength via coherent scattering of the SPP on the grating structure. Interrogating this Kerr parameter can be utilized for detecting chemical or biological objects in a fluid medium. The experiment results show the minimal detectable mass concentration of sodium chloride in a saline solution is 4.27 × 10(-3) %, corresponding to a refractive index change of 7.60 × 10(-6) RIU. For an avidin-biotin interaction experiment, the sensitivity of avidin detection in PBS solution is 1.97 nM, which is limited by the index fluctuation of flowing media during measurement.
authors.forename: Kuei-Hsu
authors.initials: KH
authors.lastname: Chou
authors.forename: En-Ping
authors.initials: EP
authors.lastname: Lin
authors.forename: Te-Chang
authors.initials: TC
authors.lastname: Chen
authors.forename: Chih-Huang
authors.initials: CH
authors.lastname: Lai
authors.forename: Liang-Wei
authors.initials: LW
authors.lastname: Wang
authors.forename: Ko-Wei
authors.initials: KW
authors.lastname: Chang
authors.forename: Gwo-Bin
authors.initials: GB
authors.lastname: Lee
authors.forename: Ming-Chang M
authors.initials: MC
authors.lastname: Lee