中国物理B ›› 2015, Vol. 24 ›› Issue (7): 74206-074206.doi: 10.1088/1674-1056/24/7/074206
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
袁宇阳a, 袁纵横a b, 李骁男a, 吴军a, 张文涛a, 叶松a
Yuan Yu-Yang (袁宇阳)a, Yuan Zong-Heng (袁纵横)a b, Li Xiao-Nan (李骁男)a, Wu Jun (吴军)a, Zhang Wen-Tao (张文涛)a, Ye Song (叶松)a
摘要: Noble metal nanoantenna could effectively enhance light absorption and increase detection sensitivity. In this paper, we propose a periodic Ag diamond nanoantenna array to increase the absorption of thin-film solar cells and to improve the detection sensitivity via localized surface plasmon resonance. The effect of nanoantenna arrays on the absorption enhancement is theoretically investigated using the finite difference time domain (FDTD) method with manipulating the spectral response by geometrical parameters of nanoantennas. A maximum absorption enhancement factor of 1.51 has been achieved in this study. In addition, the relation between resonant wavelength (intensity reflectivity) and refractive index is discussed in detail. When detecting the environmental index using resonant wavelengths, a maximum detection sensitivity of about 837 nm/RIU (refractive index unit) and a resolution of about 10-3 RIU can be achieved. Moreover, when using the reflectivity, the sensitivity can be as high as 0.93 AU/RIU. Furthermore, we also have theoretically studied the effectiveness of nanoantennas in distinguishing chemical reagents, solution concentrations, and solution allocation ratios by detecting refractive index. From the results presented in this paper, we conclude that this work might be useful for biosensor detection and other types of detections.
中图分类号: (Mechanical effects of light on material media, microstructures and particles)