| 基于太赫兹等离激元的半导体表面生化薄膜光谱检测 |
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| 引用本文： | 杨涛,辛菊盛,朱永元,秦亦强,李兴鳌,黄维. 基于太赫兹等离激元的半导体表面生化薄膜光谱检测[J]. 红外与毫米波学报, 2016, 35(6): 667-671 |
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| 作者姓名： | 杨涛 辛菊盛 朱永元 秦亦强 李兴鳌 黄维 |
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| 作者单位： | 南京邮电大学 有机电子与信息显示国家重点实验室培育基地,南京邮电大学 有机电子与信息显示国家重点实验室培育基地,南京大学,南京大学固体微结构国家重点实验室,南京邮电大学,南京邮电大学 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 我们提出了一种利用太赫兹表面等离激元对放置在半导体表面的生化薄膜进行光谱测量的新方法。我们从理论上证明了半导体材料对其上传输的太赫兹表面等离子体波具有较强的表面束缚性，从而提高太赫兹波与半导体表面的生化薄膜之间的相互作用。通过采用太赫兹时域光谱测量系统，我们从实验上分别得到了洋葱表皮的太赫兹表面等离子体波和自由空间太赫兹波透射波谱。实验结果表明，当测量对象是厚度仅为自由空间太赫兹波波长的约百分之一的单层洋葱表皮时，表面等离子体波的透射波谱与自由空间太赫兹波透射波谱相比具有更加多的特征吸收峰。
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| 关 键 词： | 生化薄膜，太赫兹波，等离激元，光谱 |
| 收稿时间： | 2016-01-13 |
| 修稿时间： | 2016-08-31 |
Spectrum analysis of bio-chemical thin films on the surface of a semiconductor by terahertz surface plasmon polaritons |
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| YANG Tao,XIN Ju-Sheng,ZHU Yong-Yuan,QIN Yi-Qiang,LI Xing-ao and HUANG Wei. Spectrum analysis of bio-chemical thin films on the surface of a semiconductor by terahertz surface plasmon polaritons[J]. Journal of Infrared and Millimeter Waves, 2016, 35(6): 667-671 |
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| Authors: | YANG Tao XIN Ju-Sheng ZHU Yong-Yuan QIN Yi-Qiang LI Xing-ao HUANG Wei |
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| Affiliation: | Key Laboratory for Organic Electronics and Information Display & Institute of Advanced Materials(IAM), Nanjing University of Posts and Telecommunications,Key Laboratory for Organic Electronics and Information Display & Institute of Advanced Materials(IAM), Nanjing University of Posts and Telecommunications,Nanjing university,National Laboratory of Solid State Microstructures, Nanjing University,Nanjing university of posts and telecommunications,Nanjing university of posts and telecommunications |
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| Abstract: | We propose a new method for measuring terahertz (THz) transmission spectra of bio-chemical thin films placed on the surface of a semiconductor by terahertz surface plasmon polaritons (SPPs). We theoretically prove that the semiconductor supports a strongly confined surface plasmon in the terahertz frequency range, which can be used to enhance the light-matter interaction with bio-chemical layers above the semiconductor surface. By employing a free-space THz time-domain spectroscopy (TDS) system, we experimentally obtain the transmission power spectra of onion epidermis films with free space transmission and SPP transmission respectively. Experimental results show that SPP transmission spectra represent more characteristic absorption peaks for a layer of onion epidermis film, which are more than 100 times thinner than the free space wavelength of the terahertz wave. |
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| Keywords: | terahertz surface plasmon-polaritons biological films spectroscopy |
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