Pagliero D, Li Y, Fisher S, Meriles C A
Department of Physics, CUNY—City College of New York, New York 10031, USA.
Appl Opt. 2011 Feb 10;50(5):648-54. doi: 10.1364/AO.50.000648.
Recent work demonstrating detection of nuclear spin magnetization via Faraday rotation in transparent fluids promises novel opportunities for magnetic resonance imaging and spectroscopy. Unfortunately, low sensitivity is a serious concern. With this motivation in mind, we explore the use of an optical cavity to augment the Faraday rotation experienced by a linearly polarized beam traversing a sample fluid. Relying on a setup that affords reduced sample size and high-frequency modulation, we demonstrate amplification of regular (i.e., nonnuclear) Faraday rotation of order 20. Extensions of the present methodology that take into account the geometric constraints imposed by a high-field magnet may open the way to high-sensitivity, optically-detected magnetic resonance in the liquid state.
近期的研究表明，通过透明流体中的法拉第旋转来检测核自旋磁化，这为磁共振成像和光谱学带来了新的机遇。不幸的是，低灵敏度是一个严重问题。出于这一动机，我们探索使用光学腔来增强线偏振光束穿过样品流体时所经历的法拉第旋转。依靠一种能够减小样品尺寸并进行高频调制的装置，我们展示了约20倍的常规（即非核）法拉第旋转放大。考虑到高场磁体所施加的几何约束的本方法扩展，可能为液态高灵敏度光学检测磁共振开辟道路。
