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Modulated Terahertz Transmission through Sub-Wavelength Cu Grating by Liquid Water |
| CHEN Hua, WU Xiu-Mei, YANG Wen-Xing |
| Department of Physics, Southeast University, Nanjing 210096 |
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| Cite this article: |
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CHEN Hua, WU Xiu-Mei, YANG Wen-Xing 2010 Chin. Phys. Lett. 27 010701 |
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Abstract Submerging the sub-wavelength Cu wire grating in liquid water, we prove that the transmission ration can be changed pronouncedly from 0.1THz to 1.7THz. The modulation of terahertz responses by liquid water is explained by the increasing effective electron mass in the plasmon picture. Due to this response, we extract the index of liquid water, and our results provide a potential application of using metal grating to detect real solvated condition biomaterials in the THz frequency range.
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| Keywords:
07.57.Hm
42.25.Bs
78.20.Ci
07.57.Hm
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Received: 09 October 2009
Published: 30 December 2009
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| PACS: |
07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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07.57.Hm
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(Infrared, submillimeter wave, microwave, and radiowave sources)
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