PHASE-SENSITIVE TERAHERTZ SPECTROSCOPY WITH BWOs IN REFLECTION MODE

被引:0
作者
Pronin, A. V. [1 ]
Goncharov, Yu. G. [2 ]
Fischer, T. [1 ]
Wosnitza, J. [1 ]
机构
[1] FZ Dresden Rossendorf, Hochfeld Magnetlabor Dresden HLD, D-01314 Dresden, Germany
[2] RAS, AM Prokhorov Inst General Phys, Moscow 119991, Russia
来源
2009 34TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, VOLS 1 AND 2 | 2009年
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中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We report on a method, which allows accurate measurements of complex reflection coefficient, (r) over cap = vertical bar(r) over cap vertical bar . exp(i phi(R)), of a solid at frequencies 1 to 50 cm(-1) (30 GHz - 1.5 THz). Backward-wave oscillators (BWOs) are used as sources of monochromatic coherent radiation, tunable in frequency. The amplitude of the complex reflection (the reflectivity) is measured in a standard way, while the phase shift, introduced by the reflection from the sample surface, is measured using a Michelson interferometer. This method is particular useful for not-transparent samples, where phase-sensitive transmission measurements are not possible. The method requires no Kramers-Kronig transformation in order to extract the sample's electrodynamic properties (such as complex dielectric function or complex conductivity). Another area of application of this method is the study of magnetic materials with complex dynamic permeability different from unity at the measurement frequencies (for example, metamaterials). Measuring both, the phase-sensitive transmission and the phase-sensitive reflection, would allow a straightforward model-independent determination of the dielectric permittivity and magnetic permeability of such materials.
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页码:824 / +
页数:2
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