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Related Experiment Video

Updated: Jun 7, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Microstructured large-area photoconductive terahertz emitters driven at high average power.

Mohsen Khalili, Tim Vogel, Yicheng Wang

    Optics Express
    |November 14, 2024
    PubMed
    Summary

    This study demonstrates high-power terahertz (THz) generation using a novel Ytterbium (Yb)-based laser system and a large-area photoconductive emitter. The findings pave the way for advanced THz sources for applications like imaging.

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    Area of Science:

    • Optoelectronics and Photonics
    • Terahertz (THz) Science and Technology
    • Ultrafast Laser Applications

    Background:

    • Photoconductive emitters driven by ultrafast lasers are established THz sources.
    • Previous research primarily used moderate-power lasers (mW to few W).
    • High-power, high-repetition-rate laser systems for THz generation remain underexplored.

    Purpose of the Study:

    • To investigate THz emission using a high-power, MHz repetition rate Ytterbium (Yb)-based oscillator.
    • To explore the performance of a microstructured, large-area photoconductive emitter with a high-power laser source.
    • To analyze the impact of excitation power, bias voltage, and optical fluence on THz emitter performance.

    Main Methods:

    • Utilized a frequency-doubled, home-built Yb-oscillator delivering 22 W average power, 115 fs pulses, and 91 MHz repetition rate at 516 nm.
    • Employed a 10x10 mm² microstructured, large-area photoconductive emitter made of semi-insulating GaAs.
    • Investigated emitter performance under varying optical power (up to 18 W), bias voltage, and optical fluence.

    Main Results:

    • Achieved 65 µW THz average power with 4 THz bandwidth using 9 W of optical power on the emitter.
    • The emitter withstood up to 18 W of optical power without damage, indicating robustness.
    • Optical power demonstrated a more significant impact on emitter saturation compared to electrical power.

    Conclusions:

    • High-power THz generation is feasible using Yb-based oscillators and large-area photoconductive emitters.
    • The study highlights the critical role of optical power and suggests optimized heatsinking for improved efficiency.
    • This research enables the development of high-repetition-rate, high-power THz sources for applications like THz imaging.