Hollow Core Light Cage: Trapping Light Behind Bars
Hollow Core Light Cage: Trapping Light Behind Bars
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DOI：
10.1021/acsphotonics.8b01428
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发表时间：
2019-03-01
期刊：
影响因子：
7
通讯作者：
Schmidt, Markus A.
中科院分区：
文献类型：
--
作者：
Jain, Chhavi;Braun, Avi;Schmidt, Markus A.
光波导是集成平面光子电路的关键元件，它彻底改变了光子学的许多领域，包括电信、医学、环境科学和光产生。然而，实心波导的使用限制了需要在气体或液体等低介电常数介质内进行强轻物质相互作用的应用，这引发了人们对空心波导的极大兴趣。在这里，我们介绍了片上空心光笼的概念，该光笼由围绕中心空心的独立圆柱形电介质线阵列组成，使用 3D 纳米打印实现。该笼通过反谐振引导机制运行，并表现出非凡的特性，例如（1）在紫外、可见和近红外光谱域内超过厘米距离的“准空气”中无衍射传播，（2）通过股线之间的开放空间独特地侧向直接进入中空核心，将气体扩散时间加快至少10（4）倍，以及（3）中空部分中模态场的比例极高（> 99.9％）。凭借这些特性，光笼可以克服当前平面空心波导技术的局限性，从而在量子技术、超快光谱、生物分析、声光、光流控和非线性光学领域实现前所未有的未来片上应用。
Optical waveguides represent the key element of integrated planar photonic circuitry having revolutionized many fields of photonics ranging from telecommunications, medicine, environmental science, and light generation. However, the use of solid cores imposes limitations on applications demanding strong light matter interaction within low permittivity media such as gases or liquids, which has triggered substantial interest toward hollow core waveguides. Here, we introduce the concept of an on-chip hollow core light cage that consists of freestanding arrays of cylindrical dielectric strands around a central hollow core implemented using 3D nanoprinting. The cage operates by an antiresonant guidance mechanism and exhibits extraordinary properties such as (1) diffractionless propagation in "quasi-air" over more than a centimeter distance within the ultraviolet, visible and near-infrared spectral domains, (2) unique side-wise direct access to the hollow core via open spaces between the strands speeding up gas diffusion times by at least a factor of 10(4), and (3) an extraordinary high fraction of modal fields in the hollow section (>99.9%). With these properties, the light cage can overcome the limitations of current planar hollow core waveguide technology, allowing unprecedented future on-chip applications within quantum technology, ultrafast spectroscopy, bioanalytics, acousto-optics, optofluidics, and nonlinear optics.