更宽的工作频带和更低的雷达散射截面(radar cross section,RCS)一直是低可探测领域研究的热点,然而这两者往往难以兼顾.鉴于此,本文提出了一种幅相同调的吸波-对消RCS减缩超表面,通过在宽带范围内同时设计两个单元的反射相位和反射幅度...更宽的工作频带和更低的雷达散射截面(radar cross section,RCS)一直是低可探测领域研究的热点,然而这两者往往难以兼顾.鉴于此,本文提出了一种幅相同调的吸波-对消RCS减缩超表面,通过在宽带范围内同时设计两个单元的反射相位和反射幅度,使目标RCS在空间域和能量域分别获得10 d B以上减缩,从而通过叠加获得20 d B以上的宽带RCS减缩.仿真和实验结果表明,在两种极化下,幅相同调的吸波-对消RCS减缩超表面可以在6.10—12.15 GHz频带范围内获得20 d B以上的RCS减缩效果,同时10 d B减缩带宽为4.3—14.2 GHz.所设计的超表面具有减缩幅度大、减缩频带宽、质量轻、单层结构、极化稳定性好、柔性易共形等优点,有望为低可探测材料研制以及低可探测装备性能提升提供新的技术途径.展开更多
Based on the Rydberg cascade electromagnetically induced transparency,we propose a simultaneous dual-wavelength locking method for Rydberg atomic sensing at room temperature.The simplified frequency-locking configurat...Based on the Rydberg cascade electromagnetically induced transparency,we propose a simultaneous dual-wavelength locking method for Rydberg atomic sensing at room temperature.The simplified frequency-locking configuration uses only one signal generator and one electro-optic modulator,realizing real-time feedback for both lasers.We studied the effect of the different probe and coupling laser powers on the error signal.In addition,the Allan variance and a 10 kHz amplitudemodulated signal are introduced to evaluate the performance of the laser frequency stabilization.In principle,the laser frequency stabilization method presented here can be extended to any cascade Rydberg atomic system.展开更多
Based on Autler–Townes splitting and AC Stark shifts,we present a Rydberg atom-based receiver for determining the amplitude modulation(AM)frequency among a wideband carrier range utilizing a cesium atomic vapor cell....Based on Autler–Townes splitting and AC Stark shifts,we present a Rydberg atom-based receiver for determining the amplitude modulation(AM)frequency among a wideband carrier range utilizing a cesium atomic vapor cell.To verify this approach,we measured the signal-to-noise ratio and the data capacity with a 10 kHz AM frequency in the carrier range from 2 GHz to 18 GHz.Without changing the lasers,the working band can be easily extended to a higher range by optimizing the feed antenna and experimental configurations.展开更多
文摘更宽的工作频带和更低的雷达散射截面(radar cross section,RCS)一直是低可探测领域研究的热点,然而这两者往往难以兼顾.鉴于此,本文提出了一种幅相同调的吸波-对消RCS减缩超表面,通过在宽带范围内同时设计两个单元的反射相位和反射幅度,使目标RCS在空间域和能量域分别获得10 d B以上减缩,从而通过叠加获得20 d B以上的宽带RCS减缩.仿真和实验结果表明,在两种极化下,幅相同调的吸波-对消RCS减缩超表面可以在6.10—12.15 GHz频带范围内获得20 d B以上的RCS减缩效果,同时10 d B减缩带宽为4.3—14.2 GHz.所设计的超表面具有减缩幅度大、减缩频带宽、质量轻、单层结构、极化稳定性好、柔性易共形等优点,有望为低可探测材料研制以及低可探测装备性能提升提供新的技术途径.
基金supported by the National Natural Science Foundation of China(Nos.61901495 and 12104509)the Scientific Research Project of National University of Defense Technology(Nos.ZK19-20 and ZK20-13)。
文摘Based on the Rydberg cascade electromagnetically induced transparency,we propose a simultaneous dual-wavelength locking method for Rydberg atomic sensing at room temperature.The simplified frequency-locking configuration uses only one signal generator and one electro-optic modulator,realizing real-time feedback for both lasers.We studied the effect of the different probe and coupling laser powers on the error signal.In addition,the Allan variance and a 10 kHz amplitudemodulated signal are introduced to evaluate the performance of the laser frequency stabilization.In principle,the laser frequency stabilization method presented here can be extended to any cascade Rydberg atomic system.
基金This work was supported by the National Natural Science Foundation of China(Nos.12104509 and 61901495).
文摘Based on Autler–Townes splitting and AC Stark shifts,we present a Rydberg atom-based receiver for determining the amplitude modulation(AM)frequency among a wideband carrier range utilizing a cesium atomic vapor cell.To verify this approach,we measured the signal-to-noise ratio and the data capacity with a 10 kHz AM frequency in the carrier range from 2 GHz to 18 GHz.Without changing the lasers,the working band can be easily extended to a higher range by optimizing the feed antenna and experimental configurations.
