arXiv 0809.38552008-09-23physics.optics

慢光增强的光-物质相互作用及其在气体传感中的应用

Slow-light enhanced light-matter interactions with applications to gas sensing

K. H. Jensen, M. N. Alam, B. Scherer, A. Lambrecht, N. A. Mortensen

发表信息：: Opt. Commun. 281, 5335 (2008)
DOI：: 10.1016/j.optcom.2008.07.073

摘要：

微系统中的光学气体检测受到可用的短微米尺度光路长度的限制。最近，慢光增强吸收的概念已被提出作为一种途径，以补偿在小型化的吸收池的短路径长度。我们扩展了以前的微扰理论的情况下，布拉格堆栈渗透的光谱强色散气体具有狭窄和独特的吸收峰。我们表明，相当大的信号增强是可能的。作为一个例子，我们考虑布拉格堆栈由PMMA渗透O2。这里，可见光到近红外检测（~760 nm）所需的光程长度可以减少至少10^2倍，使得1 mm的光程长度是可行的。通过使用这种技术，光学气体检测可能在微系统中成为可能。

英文摘要：

Optical gas detection in microsystems is limited by the short micron scale optical path length available. Recently, the concept of slow-light enhanced absorption has been proposed as a route to compensate for the short path length in miniaturized absorption cells. We extend the previous perturbation theory to the case of a Bragg stack infiltrated by a spectrally strongly dispersive gas with a narrow and distinct absorption peak. We show that considerable signal enhancement is possible. As an example, we consider a Bragg stack consisting of PMMA infiltrated by O2. Here, the required optical path length for visible to near-infrared detection (~760 nm) can be reduced by at least a factor of 10^2, making a path length of 1 mm feasible. By using this technique, optical gas detection can potentially be made possible in microsystems.

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