中国物理B ›› 2016, Vol. 25 ›› Issue (3): 37303-037303.doi: 10.1088/1674-1056/25/3/037303
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
Xu-Feng Li(李旭峰), Wei Peng(彭伟), Ya-Li Zhao(赵亚丽), Qiao Wang(王乔), Ji-Lin Wei(魏计林)
Xu-Feng Li(李旭峰)1, Wei Peng(彭伟)2, Ya-Li Zhao(赵亚丽)3, Qiao Wang(王乔)2, Ji-Lin Wei(魏计林)1
摘要: In this paper, a subwavelength metal-grating assisted sensor of Kretschmann style that is capable of detecting the sample with a refractive index higher than that of the substrate is proposed. The sensor configuration is similar to the traditional Kretschmann structure, but the metal film is pattered into a grating. As a TM-polarized laser beam impinges from the substrate, a resonant dip point in reflectance curve is produced at a certain incident angle. Our studies indicate that the sensing sensitivity and resolution are affected by the grating's gap and period, and after these parameters have been optimized, a sensing sensitivity of 51.484°/RIU is obtained with a slightly changing resolution.
中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))