Applications of photoinduced electron spin polarization at room temperature to microwave technology
Applications of photoinduced electron spin polarization at room temperature to microwave technology
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DOI：
10.1063/1.1401790
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发表时间：
2001-09-10
影响因子：
4
通讯作者：
Levanon, H
中科院分区：
文献类型：
--
作者：
Blank, A;Levanon, H
我们提出了一种通过光激发产生的自旋极化来控制体磁导率的方法。这个过程涉及到在液体溶液中光激发的三重态与稳定的自由基的磁相互作用。由此产生的稳定自由基的非玻尔兹曼自旋布居反映在化学体系的渗透性的显著变化上。我们演示了这些光驱动的变化如何导致放置有活性化学系统的微波腔的反射系数(幅度和相位)的显著变化。这种效应可以用来制造超低噪声微波放大器和低损耗微波移相器，在室温和极低的自旋温度(<；16K)下工作。此外，这种现象的非线性特性可用于保护敏感仪器免受强破坏性微波脉冲的影响的装置。(C)2001年美国物理研究所。
We present a method for controlling the bulk permeability via spin polarization generated by light excitation. This process involves the magnetic interaction of photoexcited triplets with stable radicals in liquid solution. The resulting non-Boltzmann spin population of the stable radical is reflected by a significant change in the permeability of the chemical system. We demonstrate how these light-driven changes result in conspicuous changes in the reflection coefficient (amplitude and phase) of a microwave cavity in which the active chemical system is placed. This effect can lead the way to ultralow noise microwave amplifiers and low-loss microwave phase shifters, operating at room temperature with very low spin temperature (< 16 K). Moreover, the nonlinear character of the phenomenon can be utilized for devices, which protect sensitive instrumentation from a strong destructive microwave pulse. (C) 2001 American Institute of Physics.