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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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High-sensitivity telecommunication-compatible photoconductive terahertz detection through carrier transit time
Optics Express
|September 10, 2020
Summary
This study introduces a novel terahertz detector that achieves high sensitivity and signal-to-noise ratio without needing short-carrier-lifetime photoconductors. The design uses plasmonic contacts for efficient photocarrier transit, enabling broad applications in terahertz detection.
Area of Science:
- Optoelectronics
- Terahertz (THz) technology
- Semiconductor physics
Background:
- Traditional photoconductive terahertz detectors often rely on materials with short carrier lifetimes, limiting their performance and applicability.
- Achieving high sensitivity in terahertz detection typically requires specific material properties or complex device structures.
Purpose of the Study:
- To develop a telecommunication-compatible photoconductive terahertz detector that overcomes the limitations of short-carrier-lifetime materials.
- To demonstrate high-sensitivity terahertz detection with a superior signal-to-noise ratio (SNR) using a novel device design.
Main Methods:
- Utilized plasmonic contact electrodes on a thin layer of high-mobility photoconductor.
- Engineered device geometry to ensure high resistance and minimize Johnson Nyquist noise.
- Operated the detector under specific optical probe power (10 mW) and measured performance over a 3.6 THz bandwidth.
Main Results:
- Achieved a record-high signal-to-noise ratio (SNR) of 122 dB.
- Demonstrated high-sensitivity terahertz detection without employing short-carrier-lifetime photoconductors.
- Confirmed the detector's compatibility with telecommunication standards.
Conclusions:
- The presented terahertz detector design offers a viable alternative to conventional methods, enabling high-performance detection.
- The approach is versatile and can be applied to various semiconductors and optical wavelengths.
- This advancement broadens the scope of terahertz applications by removing material-specific limitations.
