研究目的
Investigating the responsivity and noise in room temperature THz direct detectors made of YBCO thin-film nano-bolometers.
研究成果
YBCO bolometers on bulk substrates are promising candidates for room temperature THz detectors due to their large RF bandwidth, fast response, and high sensitivity. The study demonstrated high responsivity and low NEP, with potential for further optimization by increasing the temperature coefficient of resistance and thermal boundary resistance.
研究不足
The study is limited by the nonuniform interface quality between the YBCO film and the substrate, which affects the thermal boundary resistance reproducibility. Additionally, the optical responsivity measurements were affected by coupling efficiency and alignment uncertainties.
1：Experimental Design and Method Selection
The study involved the fabrication and characterization of YBCO nano-bolometers integrated with planar spiral antennas for THz detection. The methodology included pulsed laser deposition (PLD) for YBCO film deposition, electron-beam lithography for device fabrication, and various measurement techniques for characterization.
2：Sample Selection and Data Sources
YBCO films with a thickness of about 70 nm were deposited on dual-side polished R-plane sapphire substrates. The samples were characterized using dc measurements, RF responsivity measurements, and output noise measurements.
3：List of Experimental Equipment and Materials
Pulsed laser deposition system, electron-beam lithography equipment, lock-in amplifier, voltage preamplifier, signal generator, power meter, SEM for imaging.
4：Experimental Procedures and Operational Workflow
The experimental procedure included film deposition, device fabrication, dc characterization, RF responsivity measurement, and noise measurement. The devices were characterized at various frequencies and bias conditions.
5：Data Analysis Methods
Data analysis involved calculating responsivity and noise equivalent power (NEP) from the measured voltage responses and noise spectra. The thermal conductance and temperature coefficient of resistance were also determined from the experimental data.
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