ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Absorption enhancement and sensing properties of Ag diamond nanoantenna arrays |
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 |
a School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China; b School of Information Engineering, Guizhou Minzu University, Guiyang 550025, China |
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Abstract 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.
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Received: 19 August 2014
Revised: 14 January 2015
Accepted manuscript online:
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PACS:
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42.50.Wk
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(Mechanical effects of light on material media, microstructures and particles)
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Fund: Project supported by the International Scientific and Technological Cooperation Projects of Guizhou Province, China (Grant No. 20117035) and the Program for Innovative Research Team of Guilin University of Electronic Technology, China (Grant No. IRTGUET). |
Corresponding Authors:
Yuan Zong-Heng
E-mail: yuanzongheng@sina.com
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Cite this article:
Yuan Yu-Yang (袁宇阳), Yuan Zong-Heng (袁纵横), Li Xiao-Nan (李骁男), Wu Jun (吴军), Zhang Wen-Tao (张文涛), Ye Song (叶松) Absorption enhancement and sensing properties of Ag diamond nanoantenna arrays 2015 Chin. Phys. B 24 074206
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