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.

介电粒子对电磁波在不同空间方向上的散射是由粒子的大小、形状和介电常数决定的。本项目的目的是对一种利用毫米波同时检测小介电粒子的大小、形状和介电常数的技术进行实验论证和理论研究。据推测，粒子尺寸比自由空间波长小得多，因此预计会出现非共振瑞利型散射。除了研究不同偏振的近平面波入射引起的散射外，还将研究径向偏振波（贝塞尔光束）的入射和散射。考虑到一个潜在的未来应用（一个类似的系统，但在频率上缩放），以表征一个单一的生物细胞在液体中，一个小的散射体，浸没在低介电对比度的液体的表征，将被探索。实验应在60 GHz左右的频率进行。不同介电常数的球体和椭球，尺寸小于1毫米，将被用作散射体。