Polarization control of terahertz wave is a challenging subject in terahertz science and technology. Here, we report a simple method to control polarization state of the terahertz wave in terahertz generation process. At room temperature, terahertz radiation from a noncentrosymmetric and chiral oxide, sillenite Bi12GeO20, is observed by the irradiation of linearly polarized femtosecond laser pulses at 800 nm. The polarization state of the emitted terahertz wave is found to be elliptic with an ellipticity of ∼0.37 ± 0.10. Furthermore, the ellipticity was altered to a nearly zero (∼0.01 ± 0.01) by changing the polarization of the incident linearly polarized femtosecond laser pulses. Such a terahertz radiation characteristic is attributable to variation of the polarization state of the emitted terahertz waves, which is induced by retardation due to the velocity mismatch between the incident femtosecond laser pulse and generated terahertz wave and by the polarization tilting due to the optical activity at 800 nm.
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28 September 2015
Research Article|
October 01 2015
Elliptically polarized terahertz radiation from a chiral oxide
R. Takeda;
R. Takeda
Department of Advanced Materials Science,
The University of Tokyo
, 5-1-5 Kashiwa-no-ha, Chiba 277-8561, Japan
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N. Kida;
N. Kida
a)
Department of Advanced Materials Science,
The University of Tokyo
, 5-1-5 Kashiwa-no-ha, Chiba 277-8561, Japan
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M. Sotome;
M. Sotome
Department of Advanced Materials Science,
The University of Tokyo
, 5-1-5 Kashiwa-no-ha, Chiba 277-8561, Japan
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H. Okamoto
H. Okamoto
Department of Advanced Materials Science,
The University of Tokyo
, 5-1-5 Kashiwa-no-ha, Chiba 277-8561, Japan
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a)
E-mail: kida@k.u-tokyo.ac.jp
Appl. Phys. Lett. 107, 131114 (2015)
Article history
Received:
August 06 2015
Accepted:
September 23 2015
Citation
R. Takeda, N. Kida, M. Sotome, H. Okamoto; Elliptically polarized terahertz radiation from a chiral oxide. Appl. Phys. Lett. 28 September 2015; 107 (13): 131114. https://doi.org/10.1063/1.4932378
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