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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Magnetic-dipolar-mode Fano resonances for microwave spectroscopy of high absorption matter
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Magnetic-dipolar-mode Fano resonances for microwave spectroscopy of high absorption matter

机译：用于高吸收物质微波光谱的磁偶极子模式Fano共振

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The interaction between high absorption matter and microwave radiated energy is a subject of great importance. In particular, this concerns the microwave spectroscopic characterization of biological liquids. The use of effective testing methods to obtain information about physical properties of different liquids on the molecular level is one of the most important problems in biophysics. However, the standard methods based on microwave resonant techniques are not sufficiently suitable for biological liquids because the resonance peak in a resonator with high-loss liquids is so broad that the material parameters cannot be measured correctly. Although molecular vibrations of biomolecules may have microwave frequencies, it is not thought that such resonant coupling is significant due to their low energy compared with thermal energy and the strongly dampening aqueous environment. This paper presents an innovative microwave sensing technique for different types of lossy materials, including biological liquids. The technique is based on the combination of the microwave perturbation method and the Fano resonance effects observed recently in microwave structures with embedded magnetic-dipolar quantum dots. When the frequency of the magnetic dipolar mode (MDM) resonance is not equal to the cavity resonance frequency, one gets Fano transmission intensity. When the MDM resonance frequency is tuned to the cavity resonance frequency, by a bias magnetic field, one observes a Lorentzian line shape. Use of an extremely narrow Lorentzian peak allows exact probing of the resonant frequency of a cavity loaded by a highly lossy material sample. For different kinds of samples, one has different frequencies of Lorentzian peaks. This presents a picture of precise spectroscopic characterization of high absorption matter in microwaves.
机译：高吸收物质与微波辐射能之间的相互作用是非常重要的主题。特别地，这涉及生物液体的微波光谱表征。使用有效的测试方法来获取有关不同液体在分子水平上的物理性质的信息是生物物理学中最重要的问题之一。但是，基于微波共振技术的标准方法不适用于生物液体，因为具有高损耗液体的共振器中的共振峰太宽，以致无法正确测量材料参数。尽管生物分子的分子振动可能具有微波频率，但由于与热能相比它们的能量较低且水环境强烈衰减，因此认为这种共振耦合并不重要。本文提出了一种创新的微波传感技术，适用于各种类型的有损材料，包括生物液体。该技术基于微波摄动方法和最近在具有嵌入式磁偶极子量子点的微波结构中观察到的Fano共振效应的结合。当磁偶极子模式（MDM）共振的频率不等于腔共振频率时，将获得Fano传输强度。当通过偏置磁场将MDM谐振频率调谐到腔谐振频率时，人们会观察到洛伦兹线形状。极窄的洛伦兹峰的使用允许精确探测由高损耗材料样品加载的腔的共振频率。对于不同种类的样品，洛伦兹峰的频率不同。这显示了微波中高吸收物质的精确光谱表征。

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