研究目的
To develop and demonstrate the use of small atomic vapor-cell sensing elements for high-spatial-resolution near-field imaging of millimeter-wave and sub-THz electric fields, and to measure these fields over wide frequency and dynamic ranges using Rydberg atom-based quantum sensing techniques.
研究成果
The study successfully demonstrates high-resolution near-field imaging of a horn antenna at 13.49 GHz with a spatial resolution of λ/10 and a dynamic range of 72 to 240 V/m using off-resonant AC-Stark shifts. It also shows sub-THz electric field measurements at 255 GHz over a 200 MHz band using near-resonant Autler-Townes splittings. The results agree well with calculations, indicating the potential for practical Rydberg-based field-sensing elements with wide frequency coverage up to 1 THz. Future work should focus on improving cell characterization and extending frequency ranges.
研究不足
The modeling of the dielectric glass cell and its mount may not be perfect, leading to slight discrepancies in field measurements. The frequency range for effective measurements is limited by the visibility of Autler-Townes lines and detectable AC Stark shifts. The spatial resolution is λ/10, which may not be sufficient for all applications.
1：Experimental Design and Method Selection:
The experiment uses quantum-optical electromagnetically induced transparency (EIT) spectroscopy of Rydberg states in rubidium vapor cells to detect electric fields. Methods include off-resonance AC-Stark shifts for field strength measurement and near-resonant Autler-Townes splittings for frequency-dependent measurements.
2：Sample Selection and Data Sources:
A small glass cell filled with rubidium vapor, with an active sensing region of 3-mm inner dimension, is used. Data is acquired through laser spectroscopy measurements.
3：List of Experimental Equipment and Materials:
Rubidium vapor cell, lasers at 780 nm and 480 nm, Ku-band horn antenna, conical mmW horn, frequency stabilization equipment, translation stages for spatial scanning.
4：Experimental Procedures and Operational Workflow:
For near-field imaging, the horn antenna is positioned 7.5 mm from the sensing element and translated in steps of 1.9 mm. Lasers are counter-propagated through the cell, with the 480 nm laser scanned across Rydberg transitions. Transmission of 780 nm light is measured to detect EIT peaks. For sub-THz measurements, the mmW frequency is varied around an atomic resonance, and Autler-Townes splittings are analyzed.
5：5 mm from the sensing element and translated in steps of 9 mm. Lasers are counter-propagated through the cell, with the 480 nm laser scanned across Rydberg transitions. Transmission of 780 nm light is measured to detect EIT peaks. For sub-THz measurements, the mmW frequency is varied around an atomic resonance, and Autler-Townes splittings are analyzed.
Data Analysis Methods:
5. Data Analysis Methods: Field strength is calculated from measured atomic line shifts using the relation E = (4Δ/α)^0.5, where Δ is the peak shift and α is the polarizability. Splitting patterns are used to determine field strengths and frequency dependencies.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
