Application of strong transverse magneto-optical Kerr effect on high sensitive surface plasmon grating sensors

作者：Chou Kuei Hsu; Lin En Ping; Chen Te Chang; Lai Chih Huang; Wang Liang Wei; Chang Ko Wei; Lee Gwo Bin; Lee Ming Chang M^*

来源：Optics Express, 2014, 22(16).

DOI：10.1364/OE.22.01914119794

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 x 10(-3) %, corresponding to a refractive index change of 7.60 x 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.

• 出版日期2014-8-11
• 单位清华大学