Liquid-infiltrated photonic crystals: enhanced light-matter interactions for lab-on-a-chip applications
Liquid-infiltrated photonic crystals: enhanced light-matter interactions for lab-on-a-chip applications
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DOI：
10.1007/s10404-007-0203-2
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发表时间：
2008-01-01
影响因子：
2.8
通讯作者：
Pedersen, Jesper
中科院分区：
文献类型：
--
作者：
Mortensen, Niels Asger;Xiao, Sanshui;Pedersen, Jesper
光学技术在化学分析和生化分析中得到了广泛的应用。在过去的十年中，人们越来越重视化学分析系统的小型化，这自然刺激了在芯片实验室微系统中集成微流体和光学的巨大努力。这一发展在一定程度上定义了新兴的光流体领域。尺度分析和实验表明，在许多化学应用中，微尺度器件比宏观器件具有优势。然而，从光学角度来看，与宏观尺度实验（例如在试管中）相比，小型化设备受到光程减少的极大影响。显然，光程的减小使光学技术在片上实验室系统中的应用变得复杂。在本文中，我们从理论上讨论了如何使用强色散光子晶体环境来增强光-物质相互作用，从而潜在地补偿芯片上实验室系统中减少的光路。结合电磁摄动理论和全波电磁模拟，我们讨论了实现比尔-兰伯特-布格吸收的慢光增强、光子带隙折射测量和高q腔传感的前景。
Optical techniques are finding widespread use in analytical chemistry for chemical and bio-chemical analysis. During the past decade, there has been an increasing emphasis on miniaturization of chemical analysis systems and naturally this has stimulated a large effort in integrating microfluidics and optics in lab-on-a-chip microsystems. This development is partly defining the emerging field of optofluidics. Scaling analysis and experiments have demonstrated the advantage of micro-scale devices over their macroscopic counterparts for a number of chemical applications. However, from an optical point of view, miniaturized devices suffer dramatically from the reduced optical path compared to macroscale experiments, e.g. in a cuvette. Obviously, the reduced optical path complicates the application of optical techniques in lab-on-a-chip systems. In this paper we theoretically discuss how a strongly dispersive photonic crystal environment may be used to enhance the light-matter interactions, thus potentially compensating for the reduced optical path in lab-on-a-chip systems. Combining electromagnetic perturbation theory with full-wave electromagnetic simulations we address the prospects for achieving slow-light enhancement of Beer-Lambert-Bouguer absorption, photonic band-gap based refractometry, and high-Q cavity sensing.