A High Sensitivity Index Sensor Based on Magnetic Plasmon Resonance in Metallic Grating with Very Narrow Slits
XU Bin-Zong, LIU Jie-Tao, HU Hai-Feng, WANG Li-Na, WEI Xin, SONG Guo-Feng**
Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
Abstract ：The index sensing characteristics of metallic deep gratings are numerically investigated. The concept is based on magnetic polariton resonance, which is very sensitive to changes in the refractive index of the surrounding medium. We numerically demonstrate that the sensitivity and figure of merit of the magnetic plasmon mode can be tailored by adjusting the depth and width of the slits. The highest sensitivity of 1542 nm per refractive index unit with a good figure of merit of 12.3 is obtained. The angle-insensitive property with a high signal intensity of this system could be useful for the future design and application of wide-range sensitive plasmonic index sensors.
收稿日期: 2012-11-28
出版日期: 2013-04-28
:
07.07.Df
(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)
87.85.fk
(Biosensors)
73.20.Mf
(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
42.81.Pa
(Sensors, gyros)
42.90.+m
(Other topics in optics)
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2013, Vol. 30 
