研究目的
To compare the responsivity and noise equivalent power (NEP) among the THz direct detectors with thermal, microwave (MW) and THz biasing to find the best biasing method.
研究成果
The current responsivity of 244 A/W and 105 A/W are obtained for MW and THz biasing, respectively, which is about one order higher than that of thermal biasing. The NEP of 4.5 pW/√Hz is obtained with MW biasing, indicating potential for further improvement.
研究不足
The study is limited to a specific frequency (0.65 THz) and temperature (4.2 K). The NEP with MW biasing, while improved, may still require further optimization for certain applications.
1：Experimental Design and Method Selection:
The study involves comparing the performance of superconducting HEBs under three different biasing methods (thermal, MW, and THz) at
2：65 THz and 2 K. Sample Selection and Data Sources:
Superconducting HEBs fabricated from
3：5 nm thick NbN film deposited onto a high-resistivity Si substrate with a logarithmic spiral planar antenna made of gold. List of Experimental Equipment and Materials:
Includes an MW synthesizer, a
4：648 THz source, a DC low noise amplifier (LNA), SR830 lock-in amplifier, and 35670A dynamic signal analyzer. Experimental Procedures and Operational Workflow:
The signal sources are ambient and silicon carbide (SiC) ceramic hot black bodies, modulated by an optical chopper, and detected by the HEBs.
5：Data Analysis Methods:
The current responsivity and NEP are measured and compared for each biasing method.
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