Optical mode confinement in three-dimensional Al/SiO2 nano-cavities with hyperbolic dispersion
Optical mode confinement in three-dimensional Al/SiO2 nano-cavities with hyperbolic dispersion
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DOI：
10.1117/12.2187135
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
C. Bacco;P. Kelly;L. Kuznetsova
中科院分区：
文献类型：
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作者：
C. Bacco;P. Kelly;L. Kuznetsova
当今的技术需求要求更快、更小的光学元件。光学微腔在小的体积内提供了对电磁场的高度限制，其尺寸与光的波长相当，这为在纳米尺度上增强光-物质相互作用提供了独特的系统。然而，进一步减小光学腔的尺寸（从微腔到纳米腔）受限于基本衍射极限。在双曲型超材料中，可以实现大的波矢量。因此，由双曲超材料产生的光学腔允许将电磁场限制在极小的体积内，其尺寸显著小于光的波长。本文介绍了数值研究的结果，在纳米腔的双曲色散使用纳米层Al/SiO2双曲超材料与不同的Al填充分数。利用有限元数值方法研究了纳米腔的光学模式和谐振频率的基本特性。数值模拟结果表明，光可以被很好地限制在半径为λ/65的圆盘中。本文还将关注其他变量，如Q因子和Al填充分数。具有双曲色散的三维纳米腔的潜在未来应用包括：硅光子学光通信网络、超快LED和生物纳米颗粒传感。
Today’s technological needs are demanding for faster and smaller optical components. Optical microcavities offer a high confinement of electromagnetic field in a small volume, with dimensions comparable to the wavelength of light, which provides a unique system for the enhancement of light-matter interactions on the nanoscale. However, further reducing the size of the optical cavity (from microcavity to nanocavity) is limited to the fundamental diffraction limit. In hyperbolic metamaterials, large wave vectors can be achieved. Therefore, optical cavities, created from hyperbolic metamaterials, allow the confinement of the electromagnetic field to an extremely small volume with dimensions significantly smaller than the wavelength of light. This paper presents the results of numerical study of the optical mode confinement in nanocavities with hyperbolic dispersion using nanolayered Al/SiO2 hyperbolic metamaterial with different Al fill fractions. The fundamental properties of the optical modes and resonance frequencies for the nanocavities are studied using the finite-elementmethod numerical technique. Numerical simulations show that the light can be well confined in a disk with radius up to λ/65. This paper will also focus on other variables such as Q-factor and Al fill fraction. Potential future applications for three-dimensional nanocavities with hyperbolic dispersion include: silicon photonics optical communications networks, ultrafast LEDs and biological nanoparticles sensing.