Abstract
We report the observation of terahertz (THz) electric field induced conductivity modulation in sub-wavelength gold plasmonic media. Through all-THz pump-probe time-resolved transmission spectroscopy, we demonstrate that the presence of induced surface charges influences near-field mediated light propagation. The phenomenon is ascribed to the enhanced metal conductivity due to enhanced surface density of conduction electrons. The surface induced charge dynamics are revealed via phase-dependent time-resolved signatures. The phenomenon is a prelude to a wide class of ultrafast active THz plasmonic devices and paves the way for plasmonic field effects devices, similar to semiconductor ones.
Highlights
We report the observation of terahertz (THz) electric field induced conductivity modulation in sub-wavelength gold plasmonic media
Through all-THz pump-probe time-resolved transmission spectroscopy, we demonstrate that the presence of induced surface charges influences near-field mediated light propagation
When a metal is exposed to an electric field, conduction electrons are displaced within a femtosecond timescale to counteract the presence of the perturbing electric field inside the conductor, leaving behind immobile positively charged ions
Summary
We report the observation of terahertz (THz) electric field induced conductivity modulation in sub-wavelength gold plasmonic media. Through all-THz pump-probe time-resolved transmission spectroscopy, we demonstrate that the presence of induced surface charges influences near-field mediated light propagation. In this Letter, we report on experimental observation of THz field-induced conductivity modulation in a metallic gold plasmonic medium using phase-controlled THz-pump/THz-probe time-resolved transmission spectroscopy.
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