宽带共振免标定液体溶液复介电常数反演
Broadband resonant calibration-free complex permittivity retrieval of liquid solutions
摘要：
材料磁化率控制着电磁波和物质之间的相互作用，对于自然现象的基本理解和定制实际应用至关重要。在这里，我们提出了一种新的校准的相对复介电常数的检索方法，它允许使用方便和廉价的设备，并简化了测量过程。该方法结合了共振和非共振技术的优点，允许在宽频率范围内提取液体和固体的参数，其中材料的损耗角正切小于0.5。该方法的本质是基于在具有可变尺寸的球形样品中激发磁偶极共振。利用米氏理论将磁偶极模的谐振频率和品质因数映射到介电常数的实部和虚部上。样品由液体溶液组成，封闭在可拉伸的覆盖物中，这允许连续改变尺寸。这种方法允许在宽的频率范围内调谐磁偶极共振，有效地使共振恢复方法宽带。该技术可以扩展到粉末和固体材料，这取决于它们的物理参数，如粒度和可加工性。
英文摘要：
Material susceptibilities govern interactions between electromagnetic waves and matter and are of a crucial importance for basic understanding of natural phenomena and for tailoring practical applications. Here we present a new calibration-free method for relative complex permittivity retrieval, which allows using accessible and cheap apparatus and simplifies the measurement process. The method combines advantages of resonant and non-resonant techniques, allowing to extract parameters of liquids and solids in a broad frequency range, where material's loss tangent is less than 0.5. The essence of the method is based on exciting magnetic dipole resonance in a spherical sample with variable dimensions. Size-dependent resonant frequencies and quality factors of magnetic dipolar modes are mapped on real and imaginary parts of permittivity by employing Mie theory. Samples are comprised of liquid solutions, enclosed in stretchable covers, which allows changing the dimensions continuously. This approach allows tuning magnetic dipolar resonance over a wide frequency range, effectively making resonance retrieval method broadband. The technique can be extended to powder and solid materials, depending on their physical parameters, such as granularity and processability.
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