研究目的
Investigating the all-optical broadband phase control of THz pulses for applications in optical communications and spectroscopy.
研究成果
The study successfully demonstrates broadband phase control at THz frequencies, showing CEP shifts and the ability to synthesize arbitrarily dispersed waveforms. This platform is reversible and fully-reconfigurable, making it a valuable tool for THz arbitrary waveform synthesis and future photonics and control experiments in the THz range.
研究不足
The technique's effectiveness is dependent on the precision of the spatial patterning of the pump pulse and the quality of the waveguide and reflective interfaces. Potential areas for optimization include the reduction of light leakage and improvement in reflectivity.
1：Experimental Design and Method Selection:
The experiment utilizes spatially patterned fs pump pulses to inject photoconductive regions inside a silicon-filled THz parallel-plate waveguide (PPWG), creating light-induced THz quasi-optical components.
2：Sample Selection and Data Sources:
THz pulses are coupled into the waveguide via an adiabatically tapered horn antenna, propagating in the fundamental, dispersionless, TM00 geometric mode.
3：List of Experimental Equipment and Materials:
A spatial light modulator (SLM) is used for patterning photoexcitations, with a thick ITO layer serving as a transparent top-plate window and a 150 nm thick gold waveguide back plane.
4：Experimental Procedures and Operational Workflow:
The phase of THz light is tuned by reflections from distributed interfaces, enabling manipulation of the carrier-envelope phase (CEP).
5：Data Analysis Methods:
The phase change mechanics are captured by an analytical Drude model in the dc limit.
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