Research output: Contribution to journal › Article › peer-review
Specific features of studying anisotropic media by methods of time-domain terahertz spectroscopy. / Antsygin, V. D.; Losev, V. F.; Mamrashev, A. A. et al.
In: Optoelectronics, Instrumentation and Data Processing, Vol. 52, No. 4, 01.07.2016, p. 374-380.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Specific features of studying anisotropic media by methods of time-domain terahertz spectroscopy
AU - Antsygin, V. D.
AU - Losev, V. F.
AU - Mamrashev, A. A.
AU - Nikolaev, N. A.
AU - Potaturkin, O. I.
PY - 2016/7/1
Y1 - 2016/7/1
N2 - Wide-band time-domain terahertz (THz) spectroscopy is a popular method of studying optical properties of various materials. This method is considered as applied to polarization-sensitive measurements of properties of anisotropic materials and media possessing significant dichroism and birefringence. It is important to understand that the development of the elemental base for the terahertz range, in particular, for THz polarizers, falls behind the achievements of polarization optics for the visible range. In studying anisotropic materials, this may lead to simultaneous detection of orthogonal components of the THz field and to formation of artifacts in the spectral range in calculations of properties of examined samples. A unique specific feature of time-domain terahertz spectroscopy, namely, a possibility of capturing the time-dependent shape of the THz pulse, allows separation of the orthogonal components of the field in the time domain. Thus, it is possible to detect the signal from radiation with the orthogonal polarization and eliminate it by means of appropriate adjustment of polarization elements of the spectroscopy system. This method is demonstrated by an example of studying the terahertz properties along the optical axis z of an anisotropic ferroelectric crystal of lead germanate in which significant birefringence and dichroism arise as the crystal is heated to the phase transition temperature.
AB - Wide-band time-domain terahertz (THz) spectroscopy is a popular method of studying optical properties of various materials. This method is considered as applied to polarization-sensitive measurements of properties of anisotropic materials and media possessing significant dichroism and birefringence. It is important to understand that the development of the elemental base for the terahertz range, in particular, for THz polarizers, falls behind the achievements of polarization optics for the visible range. In studying anisotropic materials, this may lead to simultaneous detection of orthogonal components of the THz field and to formation of artifacts in the spectral range in calculations of properties of examined samples. A unique specific feature of time-domain terahertz spectroscopy, namely, a possibility of capturing the time-dependent shape of the THz pulse, allows separation of the orthogonal components of the field in the time domain. Thus, it is possible to detect the signal from radiation with the orthogonal polarization and eliminate it by means of appropriate adjustment of polarization elements of the spectroscopy system. This method is demonstrated by an example of studying the terahertz properties along the optical axis z of an anisotropic ferroelectric crystal of lead germanate in which significant birefringence and dichroism arise as the crystal is heated to the phase transition temperature.
KW - birefringence
KW - dichroism
KW - ferroelectric
KW - lead germanate
KW - polarization-optical detection
KW - terahertz radiation
KW - terahertz spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84991678381&partnerID=8YFLogxK
U2 - 10.3103/S8756699016040099
DO - 10.3103/S8756699016040099
M3 - Article
AN - SCOPUS:84991678381
VL - 52
SP - 374
EP - 380
JO - Optoelectronics, Instrumentation and Data Processing
JF - Optoelectronics, Instrumentation and Data Processing
SN - 8756-6990
IS - 4
ER -
ID: 25325781