论文标题
S频段电子自旋共振光谱使用短路的共面波导共振器
S-band electron spin resonance spectroscopy using a short-circuited coplanar waveguide resonator
论文作者
论文摘要
在这项工作中，我们研究了共面波导（CPW）谐振器的发展及其在电子旋转共振（ESR）光谱仪中的使用。 CPW谐振器旨在用S波段运行。它具有短路配置，可导致微型化。它的结构如此之多，以至于具有50欧姆的特征阻抗。由于其单皮性质，已经对该谐振器进行了详细的电磁模拟，并特别强调了结构的激发。设计参数和电磁场分布是从模拟获得的。谐振器是使用快速原型制作技术的光刻制造的。通过将其耦合到向量网络分析仪（VNA）来测量谐振器的特征响应。自由基2,2-二苯基-1-苯羟基（DPPH）的ESR吸收光谱是通过在反射几何形状中使用该谐振器来捕获的。研究了样品位置的微波磁场分布。发现测得的G因子值与文献中报道的值一致。发现该谐振器的质量因子很低，这使其适合在脉冲ESR光谱仪中使用。
In this work, we study the development of a coplanar waveguide (CPW) resonator and its use in an electron spin resonance (ESR) spectrometer. The CPW resonator is designed to operate in S-band. It has a short circuit configuration which leads to miniaturization. It is so constructed such that it has a characteristic impedance of 50 ohms. Detailed electromagnetic simulation with a particular emphasis on the excitation of the structure has been performed for this resonator owing to its uniplanar nature. The design parameters and the electromagnetic field distribution are obtained from the simulation. The resonator is fabricated using optical lithography with a rapid prototyping technique. The characteristic response of the resonator is measured by coupling it to a Vector Network Analyzer (VNA). The ESR absorption spectrum of free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) is captured by using this resonator in reflection geometry. The microwave magnetic field distribution at the sample position is investigated.The measured g-factor value is found to be consistent with that reported in the literature. The quality factor of this resonator is found to be low and this makes it suitable for use in a Pulsed ESR spectrometer.
