Terahertz emission from cubic semiconductor induced by a transient anisotropic photocurrent

被引：22

作者：

Malevich, V. L. ^{[1
]}

Ziaziulia, P. A. ^{[2
]}

Adomavicius, R. ^{[3
]}

Krotkus, A. ^{[3
]}

Malevich, Y. V. ^{[3
]}

机构：

[1] Natl Acad Sci Belarus, Inst Phys, Minsk 220072, BELARUS

[2] Belarusian State Univ, Minsk 220030, BELARUS

[3] Ctr Phys Sci & Technol, LT-01108 Vilnius, Lithuania

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 112卷 / 07期

关键词：

INAS; GENERATION; SURFACES; PULSES; FIELD;

D O I：

10.1063/1.4758181

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Terahertz emission from the surfaces of narrow-gap semiconductors excited by femtosecond laser pulses was described in terms of a transient interband photoconductivity. It has been found that the nonparabolicity of the electron dispersion law as well as the optical alignment of the photoexcited carrier momenta result in anisotropic photocurrent with a component perpendicular to the surface dc electric field even in semiconductors with a cubic symmetry. This lateral transient photocurrent component is the strongest during the first few hundreds of femtoseconds after the photoexcitation and causes the emission of terahertz radiation pulses with an amplitude dependent on the angle between the optical field and the crystallographic axes. In the case of InAs the contribution of this component explains experimental results of both the azimuthal anisotropy of the emitted terahertz pulse amplitude and its dependence on the exciting photon energy. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4758181]

引用

页数：8

共 29 条

[1] Spectral dependencies of terahertz emission from InAs and InSb [J].

Adomavicius, R ;

Molis, G ;

Krotkus, A ;

Sirutkaitis, V .

APPLIED PHYSICS LETTERS, 2005, 87 (26) :1-3

[2] Terahertz emission from p-InAs due to the instantaneous polarization [J].

Adomavicius, R ;

Urbanowicz, A ;

Molis, G ;

Krotkus, A ;

Satkovskis, E .

APPLIED PHYSICS LETTERS, 2004, 85 (13) :2463-2465

[3]

Alperovich V.L., 1981, Sov. J. Exp. Theor. Phys, V53, P1201

[4]

BELINICHER VI, 1981, SOV PHYS SEMICOND+, V15, P1138

[5]

Bir G. L., 1974, SYMMETRY STRAIN INDU

[6]

Bube R.H., 1960, Photoconductivity of Solids

[7] GENERATION OF ULTRASHORT ELECTRICAL PULSES THROUGH SCREENING BY VIRTUAL POPULATIONS IN BIASED QUANTUM-WELLS [J].

CHEMLA, DS ;

MILLER, DAB ;

SCHMITTRINK, S .

PHYSICAL REVIEW LETTERS, 1987, 59 (09) :1018-1021

[8]

Coté D, 2002, APPL PHYS LETT, V80, P905, DOI 10.1063/1.1436530

[9] EMISSION OF SUBMILLIMETER ELECTROMAGNETIC-WAVES BY COHERENT PHONONS [J].

DEKORSY, T ;

AUER, H ;

WASCHKE, C ;

BAKKER, HJ ;

ROSKOS, HG ;

KURZ, H ;

WAGNER, V ;

GROSSE, P .

PHYSICAL REVIEW LETTERS, 1995, 74 (05) :738-741

[10]

GALPERN YS, 1969, SOV PHYS JETP-USSR, V29, P196

← 1 2 3 →