Concept and application of millimeter-wave spectroscopy for subwavelength-sized particles

亚波长颗粒毫米波光谱的概念与应用

• 批准号: 497853940
• 负责人: Professor Dr. Jan Hesselbarth
• 金额: --
• 依托单位: Institut für Hochfrequenztechnik (IHF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/497853940?language=en
• 关键词: Concept; application; millimeter; wave; spectroscopy

Scattering of electromagnetic waves, by a dielectric particle, in different spatial directions is determined by size, shape and permittivity of the particle. The objective of the proposed project is the experimental demonstration and theoretical investigation of a technique to detect simultaneously size, shape and permittivity of a small dielectric particle using millimeter waves. The particle size is supposedly much smaller than the free-space wavelength, therefore non-resonant Rayleigh-type scattering is anticipated. Besides scattering due to incidence of almost-planar waves of different polarization, incidence and scattering of a radially-polarized wave (Bessel beam) will be investigated. In view of a potential future application (of a similar system but scaled in frequency) for the characterization of a single biological cell in liquid, the characterization of a small scatterer, immersed in liquid at low dielectric contrast, will be explored. Experiments shall be conducted at frequencies around 60 GHz. Spheres and ellipsoids of different permittivity, with sizes smaller than one millimeter, will be used as scatterers.

电磁波通过介电粒子在不同空间方向上的散射取决于粒子的大小，形状和介电常数。拟议项目的目的是对使用毫米波的小型介电粒子同时检测一项技术的实验证明和理论研究。据称，粒径比自由空间波长小得多，因此预计非共振雷利型散射。除了由于几乎不同极化的几乎平面波的发生率而导致的散射外，还将研究径向极波（贝塞尔束）的发射率和散射。鉴于将来的未来应用（类似系统的频率缩放）用于表征液体中单个生物细胞的表征，将探索一个小散射器的表征，浸入低介电对比度下的液体中。实验应以60 GHz约60 GHz的频率进行。具有不同介电常数的球体和椭圆形，尺寸小于1毫米，将用作散射器。