Nonlinear electron dynamics of gold ultrathin films induced by intense terahertz waves | Zendy

Yasuo Minami | Zendy; Jun Takeda | Zendy; Thang Duy Dao | Zendy; Tadaaki Nagao | Zendy; Masahiro Kitajima | Zendy; Ikufumi Katayama | Zendy

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Nonlinear electron dynamics of gold ultrathin films induced by intense terahertz waves

Author(s) -

Yasuo Minami,

Jun Takeda,

Thang Duy Dao,

Tadaaki Nagao,

Masahiro Kitajima,

Ikufumi Katayama

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4904883

Subject(s) - terahertz radiation , electric field , transmittance , materials science , crystallite , drude model , thin film , electron , optics , terahertz spectroscopy and technology , optoelectronics , scattering , condensed matter physics , nanotechnology , physics , quantum mechanics , metallurgy

Linear and nonlinear electron dynamics of polycrystalline gold (Au) ultrathin films with thicknesses ranging from 1.4 to 5.8 nm were investigated via transmittance terahertz (THz) spectroscopy with intense electric field transients. We prepared ultrathin films with low surface roughness formed on a Si–(7 × 7) reconstructed surface, leading to the observation of monotonic decrease in THz transmittance with respect to film thickness. Furthermore, at all tested thicknesses, the transmittance decreased nonlinearly by 10%–30% with the application if high-intensity THz electric fields. Based on a Drude-model analysis, we found a significant decrease in the damping constant induced by the THz electric field, indicating that electrons are driven beyond the polycrystalline grain boundaries in Au thin films, and consequently leading to the suppression of the electron–boundary scattering rate.

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