基于法布里-珀罗谐振腔的W波段电子顺磁共振探头研制  

A W-Band Electron Paramagnetic Resonance Probe Based on Fabry-Perot Cavity

作　　者：罗文尤 荣星 LUO Wenyou;RONG Xing(CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院微观磁共振重点实验室,中国科学技术大学,安徽合肥230026

出　　处：《波谱学杂志》2024年第4期393-404,共12页Chinese Journal of Magnetic Resonance

基　　金：国家自然科学基金资助项目(12150010).

摘　　要：本文研制了一种基于法布里-珀罗谐振腔的W波段电子顺磁共振探头.利用法布里-珀罗谐振腔所具备的大体积和开放腔等特点,本文将法布里-珀罗谐振腔用作谱仪探头的谐振器部分,并且设计了波纹波导来实现微波桥与法布里-珀罗谐振腔之间的低损耗微波信号传输.所研制的探头工作在W波段,空载品质因数为1542.最终将该探头集成于W波段电子顺磁共振谱仪,通过测量Mn(Ⅱ)掺杂的CaO粉末样品的谱线,展示了该探头在常温下用于W波段连续波电子顺磁共振实验的能力.探头的调制场频率设置为100 kHz,实验结果显示探头的最大调制场幅度可达8.9 G(1 G=10^(−4)T),谱仪绝对自旋数灵敏度为6.6×10^(8)spins/(G·√Hz).This paper presents a new W-band electron paramagnetic resonance(EPR)probe design based on Fabry-Perot cavity.In this probe,a Fabry-Perot cavity with open structure and large effective volume is used as a resonator.Corrugated waveguides are designed to achieve low-loss microwave signal transmission between the W-band microwave bridge and the Fabry-Perot cavity.The probe works in W-band,and the unloaded quality factor is 1542.A room-temperature continuous wave EPR experiment with Mn(II)in CaO powder was conducted after assembling the probe into a W-band EPR spectrometer.The results show that the modulation field amplitude is 8.9 G(1 G=10−4 T)when the modulation field frequency is set to 100 kHz,and the absolute spin sensitivity is estimated to be 6.6×10^(8)spins/(G-Hz),which verifies the feasibility of utilizing Fabry-Perot cavity as a high sensitivity W-band EPR probe.

关 键 词：电子顺磁共振 法布里-珀罗谐振腔 波纹波导 灵敏度 

分 类 号：O482.53[理学—固体物理]