Optically detected magnetic resonance(ODMR)has emerged as a powerful technique for quantum sensing,enabling high-sensitivity detection of physical quantities even at room temperature.Solid-state defects,such as nitrog...Optically detected magnetic resonance(ODMR)has emerged as a powerful technique for quantum sensing,enabling high-sensitivity detection of physical quantities even at room temperature.Solid-state defects,such as nitrogen-vacancy(NV)centers in diamond,have demonstrated remarkable capabilities in this domain[1–4].However,these systems are limited by their rigid lattice structures and lack tunability.展开更多
光检测磁共振(Optically Detected Magnetic Resonance,ODMR)型磁力仪灵敏度的角相关特性决定了磁力仪的最佳工作角度范围。推导了ODMR型磁力仪不同偏振光、射频电磁场、被测磁场构型下检测信号的数学表达,基于此深入分析了基于测量水...光检测磁共振(Optically Detected Magnetic Resonance,ODMR)型磁力仪灵敏度的角相关特性决定了磁力仪的最佳工作角度范围。推导了ODMR型磁力仪不同偏振光、射频电磁场、被测磁场构型下检测信号的数学表达,基于此深入分析了基于测量水平分量的M_(X)型磁力仪、测量垂直分量的M_(Z)型磁力仪的检测灵敏度的角度依赖关系,结果表明M_(X)、M_(Z)型磁力仪在B_(rf)∥k与B_(rf)⊥k条件下的灵敏度角相关特性存在明显差异,基于此得到不同构型的ODMR型磁力仪进行磁场测量时的最佳安装角度。展开更多
为了解决传统的荧光光谱采集系统与光探测磁共振(optically detected magnetic resonance,后文简称ODMR)光谱采集系统存在的搭建繁琐、检测样品聚焦精度较低、采集系统之间转换困难以及ODMR光谱采集信号信噪比和采集精度较低的问题,设...为了解决传统的荧光光谱采集系统与光探测磁共振(optically detected magnetic resonance,后文简称ODMR)光谱采集系统存在的搭建繁琐、检测样品聚焦精度较低、采集系统之间转换困难以及ODMR光谱采集信号信噪比和采集精度较低的问题,设计了基于光纤传感的荧光采集与ODMR光谱采集转换系统。通过光纤将激发光源电路、微波传感天线、光纤传感器、显微聚焦光路、PD(photodetector)放大电路、信号处理模块以及荧光光谱仪各模块进行耦合集成,为信号处理的软件提供硬件部分支持。在软件部分,通过开源程序编写实现信号数据处理以及光谱成像功能,利用PD放大电路对数据进行初步处理之后,在软件部分通过信号处理模块进行进一步处理,数据以图谱形式呈现,并且最终磁灵敏度达到0.51 nT/Hz^(1/2)。展开更多
We present the first findings of the new electrically- and optically-detected magnetic resonance technique [ED electron spin resonance (EDESR) and (ODMR)] which reveal single point defects in the ultra-narrow silicon ...We present the first findings of the new electrically- and optically-detected magnetic resonance technique [ED electron spin resonance (EDESR) and (ODMR)] which reveal single point defects in the ultra-narrow silicon quantum wells (Si-QW) confined by the superconductor δ-barriers. This technique allows the ESR identification without the application of the external cavity as well as a high frequency source and recorder, with measuring the only magnetoresistance (EDESR) and transmission (ODMR) spectra within frameworks of the excitonic normal-mode coupling (NMC) caused by the microcavities embedded in the Si-QW plane. The new resonant positive magnetoresistance data are interpreted here in terms of the interference transition in the diffusive transport of free holes respectively between the weak antilocalization regime in the region far from the ESR of a paramagnetic point defect located inside or near the conductive channel and the weak localization regime in the nearest region of the ESR of that defect.展开更多
文章设计一种应用于金刚石氮空位(nitrogen-vacancy,NV)系综量子实验的数字锁相放大器。为实现高速模拟与数字信号的采样、输出以及软硬件协同与同步处理能力,设计采用ZYNQ-7010芯片作为核心器件,基于现场可编程门阵列(field programmab...文章设计一种应用于金刚石氮空位(nitrogen-vacancy,NV)系综量子实验的数字锁相放大器。为实现高速模拟与数字信号的采样、输出以及软硬件协同与同步处理能力,设计采用ZYNQ-7010芯片作为核心器件,基于现场可编程门阵列(field programmable gate array,FPGA)与精简指令集计算机(reduced instruction set computer,RISC)微处理器(advanced RISC machines,ARM)内核的基本架构,同时搭载双路高采样率的模数转换器(analog to digital converter,ADC)和数模转换器(digital to analog converter,DAC)。整套系统可以同时进行多路锁相放大处理,输入模拟噪声低至1 nV/Hz 1/2,采样率高达125 MS/s,数据传输带宽可达800 Mib/s,具有集成化程度高、易操控、锁相准确性较高等特点。该设计成功应用在NV系综实验平台上,光探测磁共振(optically detected magnetic resonance,ODMR)实验及后续计算结果表明,使用文中锁相放大器的磁强计灵敏度可以达到1.23 nT/Hz 1/2。展开更多
Negatively charged boron vacancy(V_(B)^(-))spin defects are stable in nanoscale hexagonal boron nitride(hBN)flakes,which can be easily integrated into two-dimensional materials and devices to serve as both sensors and...Negatively charged boron vacancy(V_(B)^(-))spin defects are stable in nanoscale hexagonal boron nitride(hBN)flakes,which can be easily integrated into two-dimensional materials and devices to serve as both sensors and protective materials.Ion irradiation is frequently employed to create V_(B)^(-)spin defects in hBN.However,the optimal ion irradiation parameters remain unclear,even though they play a crucial role in determining the depth and density of the defects,which in turn affect sensing sensitivity.In this work,we optimize the carbon ion irradiation parameters for creating V_(B)^(-)spin defects by varying the irradiation dose and the incident angle.For 30 keV carbon ion irradiation,the optimal irradiation dose to create a V_(B)^(-)ensemble is determined to be 4×10^(13)ions/cm^(2),and both continuous and pulsed optically detected magnetic resonance measurements are used to estimate the magnetic sensitivity and spin coherence properties.Moreover,the incident angle of energetic ions is found to influence both the depth and density distributions of the V_(B)^(-)ensemble,a factor that is often overlooked.These results pave the way for improving the performance of quantum sensors based on hBN spin defects by optimizing the irradiation parameters.展开更多
Non-hydrostatic stress plays a significant role in shaping the properties of materials under compression.High-pressure effects such as yielding deformation,phase transitions,and volume contraction can alter the pressu...Non-hydrostatic stress plays a significant role in shaping the properties of materials under compression.High-pressure effects such as yielding deformation,phase transitions,and volume contraction can alter the pressure distribution within the pressure chamber.However,due to the inherent size limitation of the diamond anvil cell(DAC),in situ high-pressure studies usually assume a hydrostatic environment,equaling the pressure of samples to a pressure calibrator inside the chamber.Accurately imaging pressure distribution within the DAC chamber remains challenging,particularly as the material undergoes phase transitions.Here,we present a method for mapping pressure distribution with high spatial resolution using wide-field optically detected magnetic resonance(ODMR)of nanodiamonds.The pressure gradients during the highpressure transition of zinc oxide(ZnO)were compared using both the multiple rubies technique and wide-field ODMR.The latter technique demonstrated superior spatial resolution,easier operation,and more detailed information.These results highlight the potential of wide-field ODMR as a powerful tool for precise pressure sensing,particularly in studies involving non-hydrostatic pressure conditions.展开更多
文摘Optically detected magnetic resonance(ODMR)has emerged as a powerful technique for quantum sensing,enabling high-sensitivity detection of physical quantities even at room temperature.Solid-state defects,such as nitrogen-vacancy(NV)centers in diamond,have demonstrated remarkable capabilities in this domain[1–4].However,these systems are limited by their rigid lattice structures and lack tunability.
文摘光检测磁共振(Optically Detected Magnetic Resonance,ODMR)型磁力仪灵敏度的角相关特性决定了磁力仪的最佳工作角度范围。推导了ODMR型磁力仪不同偏振光、射频电磁场、被测磁场构型下检测信号的数学表达,基于此深入分析了基于测量水平分量的M_(X)型磁力仪、测量垂直分量的M_(Z)型磁力仪的检测灵敏度的角度依赖关系,结果表明M_(X)、M_(Z)型磁力仪在B_(rf)∥k与B_(rf)⊥k条件下的灵敏度角相关特性存在明显差异,基于此得到不同构型的ODMR型磁力仪进行磁场测量时的最佳安装角度。
文摘为了解决传统的荧光光谱采集系统与光探测磁共振(optically detected magnetic resonance,后文简称ODMR)光谱采集系统存在的搭建繁琐、检测样品聚焦精度较低、采集系统之间转换困难以及ODMR光谱采集信号信噪比和采集精度较低的问题,设计了基于光纤传感的荧光采集与ODMR光谱采集转换系统。通过光纤将激发光源电路、微波传感天线、光纤传感器、显微聚焦光路、PD(photodetector)放大电路、信号处理模块以及荧光光谱仪各模块进行耦合集成,为信号处理的软件提供硬件部分支持。在软件部分,通过开源程序编写实现信号数据处理以及光谱成像功能,利用PD放大电路对数据进行初步处理之后,在软件部分通过信号处理模块进行进一步处理,数据以图谱形式呈现,并且最终磁灵敏度达到0.51 nT/Hz^(1/2)。
文摘We present the first findings of the new electrically- and optically-detected magnetic resonance technique [ED electron spin resonance (EDESR) and (ODMR)] which reveal single point defects in the ultra-narrow silicon quantum wells (Si-QW) confined by the superconductor δ-barriers. This technique allows the ESR identification without the application of the external cavity as well as a high frequency source and recorder, with measuring the only magnetoresistance (EDESR) and transmission (ODMR) spectra within frameworks of the excitonic normal-mode coupling (NMC) caused by the microcavities embedded in the Si-QW plane. The new resonant positive magnetoresistance data are interpreted here in terms of the interference transition in the diffusive transport of free holes respectively between the weak antilocalization regime in the region far from the ESR of a paramagnetic point defect located inside or near the conductive channel and the weak localization regime in the nearest region of the ESR of that defect.
文摘文章设计一种应用于金刚石氮空位(nitrogen-vacancy,NV)系综量子实验的数字锁相放大器。为实现高速模拟与数字信号的采样、输出以及软硬件协同与同步处理能力,设计采用ZYNQ-7010芯片作为核心器件,基于现场可编程门阵列(field programmable gate array,FPGA)与精简指令集计算机(reduced instruction set computer,RISC)微处理器(advanced RISC machines,ARM)内核的基本架构,同时搭载双路高采样率的模数转换器(analog to digital converter,ADC)和数模转换器(digital to analog converter,DAC)。整套系统可以同时进行多路锁相放大处理,输入模拟噪声低至1 nV/Hz 1/2,采样率高达125 MS/s,数据传输带宽可达800 Mib/s,具有集成化程度高、易操控、锁相准确性较高等特点。该设计成功应用在NV系综实验平台上,光探测磁共振(optically detected magnetic resonance,ODMR)实验及后续计算结果表明,使用文中锁相放大器的磁强计灵敏度可以达到1.23 nT/Hz 1/2。
基金supported by the National Key Research and Development Program Project(2024YFF0726104)Key Laboratory of Modern Optical Technologies of the Education Ministry of China,Soochow University(Grant No.KJS2135)+1 种基金a China Postdoctoral Science Foundation Funded Project(Grant No.2024M751236)the Jiangxi Provincial Natural Science Foundation(Grant No.20232BAB211030).
文摘Negatively charged boron vacancy(V_(B)^(-))spin defects are stable in nanoscale hexagonal boron nitride(hBN)flakes,which can be easily integrated into two-dimensional materials and devices to serve as both sensors and protective materials.Ion irradiation is frequently employed to create V_(B)^(-)spin defects in hBN.However,the optimal ion irradiation parameters remain unclear,even though they play a crucial role in determining the depth and density of the defects,which in turn affect sensing sensitivity.In this work,we optimize the carbon ion irradiation parameters for creating V_(B)^(-)spin defects by varying the irradiation dose and the incident angle.For 30 keV carbon ion irradiation,the optimal irradiation dose to create a V_(B)^(-)ensemble is determined to be 4×10^(13)ions/cm^(2),and both continuous and pulsed optically detected magnetic resonance measurements are used to estimate the magnetic sensitivity and spin coherence properties.Moreover,the incident angle of energetic ions is found to influence both the depth and density distributions of the V_(B)^(-)ensemble,a factor that is often overlooked.These results pave the way for improving the performance of quantum sensors based on hBN spin defects by optimizing the irradiation parameters.
基金supported by the National Key R&D Program of China(Grant No.2024YFE0105200)the National Natural Science Foundation of China(Grant Nos.62422408,12374016,12174348,62271450,62027816,12422413,and 62475242).
文摘Non-hydrostatic stress plays a significant role in shaping the properties of materials under compression.High-pressure effects such as yielding deformation,phase transitions,and volume contraction can alter the pressure distribution within the pressure chamber.However,due to the inherent size limitation of the diamond anvil cell(DAC),in situ high-pressure studies usually assume a hydrostatic environment,equaling the pressure of samples to a pressure calibrator inside the chamber.Accurately imaging pressure distribution within the DAC chamber remains challenging,particularly as the material undergoes phase transitions.Here,we present a method for mapping pressure distribution with high spatial resolution using wide-field optically detected magnetic resonance(ODMR)of nanodiamonds.The pressure gradients during the highpressure transition of zinc oxide(ZnO)were compared using both the multiple rubies technique and wide-field ODMR.The latter technique demonstrated superior spatial resolution,easier operation,and more detailed information.These results highlight the potential of wide-field ODMR as a powerful tool for precise pressure sensing,particularly in studies involving non-hydrostatic pressure conditions.
