Open AccessStrong polarization-dependent terahertz modulation of aligned Ag nanowires on Si substrate
Author(s) -
Gyuseok Lee,
Inhee Maeng,
Chul Kang,
Myoung-Kyu Oh,
ChulSik Kee
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.013677
Subject(s) - terahertz radiation , materials science , nanowire , polarization (electrochemistry) , optoelectronics , optics , extinction ratio , transmittance , terahertz spectroscopy and technology , brewster's angle , physics , wavelength , chemistry , brewster
Optically tunable, strong polarization-dependent transmission of terahertz pulses through aligned Ag nanowires on a Si substrate is demonstrated. Terahertz pulses primarily pass through the Ag nanowires and the transmittance is weakly dependent on the angle between the direction of polarization of the terahertz pulse and the direction of nanowire alignment. However, the transmission of a terahertz pulse through optically excited materials strongly depends on the polarization direction. The extinction ratio increases as the power of the pumping laser increases. The enhanced polarization dependency is explained by the redistribution of photocarriers, which accelerates the sintering effect along the direction of alignment of the Ag nanowires. The photocarrier redistribution effect is examined by the enhancement of terahertz emission from the sample. Oblique metal nanowires on Si could be utilized for designing optically tunable terahertz polarization modulators.