DIELECTRIC ROD RESONATOR AT HIGH FREQUENCIES

高频介质棒谐振器

• 批准号: 8363956
• 负责人: KEITH A EARLE
• 金额: $ 0.14万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8363956
• 关键词: Caliber; Coupling; Data Collection; Frequencies; Funding; Goals; Grant; Heme Iron; Methods; National Center for Research Resources; Noise; Paper; Physiologic pulse; Principal Investigator; Quartz; Research; Research Infrastructure; Resources; Sampling; Scheme; Signal Transduction; Source; Suggestion; Technology; United States National Institutes of Health; Work; cold temperature; cost; improved; millimeter; research study; retinal rods

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. At 95GHz, ELDOR experiments in the slow tumbling/near rigid limit have demonstrated that even with a B1 of 15G, it is possible to irradiate the entire spectrum, although with reduced efficiency. Increasing the available B1 would improve the signal to noise and increase the efficiency of data collection. One promising method of accomplishing this goal is by the use of a dielectric-loaded Fabry-P¿rot resonator. For a dielectric rod of diameter equal to the free space wavelength and dielectric constant 4, corresponding to quartz at millimeter wavelengths, one can show that if one normalizes the dielectric rod beam intensity and total energy to that of a gaussian beam propagating in free space with the same intensity and total energy, then the B1 field is larger by approximately a factor of 5 in the dielectric rod over the free space field value. In other words, a dielectric rod resonator can significantly enhance the available B1 at a sample compared to its free space equivalent. The presence of the dielectric rod also has a significant localization effect on the millimeter wave field, compared to a free-space resonator, which is an advantage for size limited samples. We are exploring how to integrate the dielectric rod resonator into a practical Fabry-P¿rot resonator suitable for high power pulse work. The early paper by Chandler has useful suggestions for coupling schemes appropriate to a dielectric rod resonator. This resonator concept may also find applications in low power pulse work at 170 and 240GHz, and we are exploring this possibility with a view towards studying saturation in bio-samples, such as heme irons, at low temperatures.

该副本是利用资源的众多研究子项目之一 由NIH/NCRR资助的中心赠款提供。对该子弹的主要支持 而且，副投影的主要研究员可能是其他来源提供的 包括其他NIH来源。列出的总费用可能 代表subproject使用的中心基础架构的估计量， NCRR赠款不直接向子弹或副本人员提供的直接资金。 在95GHz时，在缓慢滚动/刚性极限的较慢的Eldor实验表明，即使B1的B1为15G，尽管效率降低，但仍可以照射整个频谱。增加可用的B1将改善信号到噪声并提高数据收集的效率。实现这一目标的一种承诺方法是使用饮食中的Fabry-p¿腐烂谐振器。对于直径的饮食棒等于自由空间波长和异构常数4，对应于毫米波长的石英，一个人可以表明，如果一个人归一化，则可以表明，在自由空间和总空间的自由空间中，在自由空间中，b1场较大的范围均在5中均具有5倍数，而在自由空间中，高斯梁在自由空间中的繁殖。换句话说，与其自由空间相比，营养棒谐振器可以显着增强样品的可用B1。与自由空间谐振器相比，营养棒的存在对毫米波场具有显着的定位效果，这对于有限的样品来说是一个优势。我们正在探索如何将营养棒谐振器集成到适用于高功率脉冲工作的实用fabry-pther谐振器中。钱德勒的早期论文对适合饮食棒谐振器的耦合方案提出了有用的建议。这种谐振器概念也可能在170和240GHz的低功率​​脉冲工作中找到应用，我们正在探索这种可能性，以研究在低温下在生物样本（例如血红素铁）中研究饱和度。