EPR Microresonators

EPR微谐振器

• 批准号: 221296648
• 负责人: Professor Dr. Dieter Suter
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik III
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/221296648?language=en
• 关键词: EPR; Microresonators

Magnetic resonance uses microwaves to exite transitions between different spin states and detects the oscillating magnetic field generated by the evolution of coherent superposition states of the spins. Excitation therefore requires the conversion of a microwave signal into an oscillating magnetic field and detection the reverse process. The efficiency of both processes can be enhanced by a suitable resonant structure, the microwave resonator. In most EPR spectrometers, these resonators consist of standing-wave cavities, whose dimensions are determined by the wavelength of the microwave field. For samples that are significantly smaller than this wavelength, cavities have a small filling factor, which reduces their sensitivity. The goal of this project is the design and implementation of highly efficient resonators for small samples. For this purpose, we use planar circuits with dimensions significantly smaller than the wavelength of the microwave. We design them such that the circuit impedance is 50 Ohm at the design frequency. The designs are simulated numerically and manufactured by standard lithographic techniques. Most of these resonators are delivered to other projects in the priority program, and we optimize the design for the requirements of these individual projects.

磁共振使用微波来探测不同自旋状态之间的跃迁，并检测由自旋的相干叠加态的演化产生的振荡磁场。因此，激发需要将微波信号转换为振荡磁场，而检测则需要相反的过程。这两个过程的效率可以通过合适的谐振结构（微波谐振器）来增强。在大多数EPR光谱仪中，这些谐振器由驻波腔组成，其尺寸由微波场的波长决定。对于显著小于该波长的样品，腔具有小的填充因子，这降低了它们的灵敏度。本项目的目标是为小样本设计和实现高效的谐振器。为此目的，我们使用尺寸明显小于微波波长的平面电路。我们设计它们，使得电路阻抗在设计频率下为50欧姆。设计进行了数值模拟和制造的标准光刻技术。大多数谐振器都交付给优先计划中的其他项目，我们根据这些单独项目的要求优化设计。