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The influence of sample shape on microwave magnetoplasma and heliconlike resonances in n‐type InSb

机译：样品形状对n型InSb中微波磁浆和螺旋状共振的影响

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Magnetoplasma and heliconlike dimensional resonances are investigated in small samples of n‐type InSb interacting with 8‐mm wave radiation at 77 K, in order to determine the influence of sample geometry on the interaction, particularly the shift of the resonance condition. Special attention is paid to the disk geometry because of its practical importance. The results are compared with mathematically tractable, but experimentally less practical, geometries: the sphere, the ellipsoid of revolution, and the infinite slab. It is found that, in analogy with ellipsoids, the magnetoplasma resonance in disk samples is determined by an empirical effective depolarizing factor, which is surprisingly close to the depolarizing factor of an ellipsoid of the same axial ratio as the disk. By using very thin disks, magnetoplasma resonance can be shifted to significantly lower magnetic fields than the resonance field observed in spheres. This is of importance for determining the lattice dielectric constant in materials containing a high concentration of carriers, for which magnetoplasma resonance in spheres occurs at inaccessibly high fields. We also observe a sequence of heliconlike dimensional resonances in disks. These resonances form a series of electric dipole and magnetic dipole excitations, as in the case of spheres. However, the resonance conditions for the disk samples are close to the Fabry‐Perot resonances in an infinite plate.
机译：为了确定样品几何形状对相互作用的影响，特别是共振条件的变化，研究了n型InSb在77 K下与8 mm波辐射相互作用的小样品的磁等离子体和螺旋状尺寸共振。由于其实际重要性，因此要特别注意磁盘的几何形状。将结果与数学上易处理但实验上不太实用的几何体（球体，旋转椭圆体和无限平板）进行比较。已经发现，与椭球类似，圆盘样品中的磁等离子体共振由经验有效的去极化因子决定，该去极化因子出乎意料地接近与盘具有相同轴向比率的椭球的去极化因子。通过使用非常薄的磁盘，可以将磁等离子体共振转移到比球体中观察到的共振场低得多的磁场。这对于确定含高浓度载流子的材料的晶格介电常数很重要，为此，球体中的磁等离子体共振发生在难以接近的高场处。我们还观察到磁盘中一系列螺旋状尺寸共振。与球体一样，这些共振会形成一系列的电偶极和磁偶极激发。但是，圆盘样品的共振条件接近无限板中的Fabry-Perot共振。

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    《Journal of Applied Physics》 |1977年第7期|P.2927-2934|共8页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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