Spectral Tuning of Localized Surface Phonon Polariton Resonators for Low-Loss Mid-IR Applications
Spectral Tuning of Localized Surface Phonon Polariton Resonators for Low-Loss Mid-IR Applications
复制标题
DOI：
10.1021/ph500143u
复制
发表时间：
2014-08-01
期刊：
影响因子：
7
通讯作者：
Maier, Stefan A.
中科院分区：
文献类型：
--
作者：
Chen, Yiguo;Francescato, Yan;Maier, Stefan A.
低损耗的表面声子极化激元（SPhP）模式内的极性电介质晶体支持是一个有前途的替代传统的，基于金属的等离子体系统的实现纳米光子组件。在这里，我们表明，单极激发在4 H-碳化硅纳米柱阵列表现出前所未有的稳定的效率，即使当谐振器填充分数变化了一个数量级。这提供了一个强大的中红外平台，具有出色的光谱可调谐性和强场限制。结合完整的电动力学计算的红外光谱测量，我们阐明了在这些细长的亚波长纳米结构的光学模式的性质，通过调查其光谱行为和局部场的依赖性的大小和周期性。本研究还提供了一个清晰的理解和实用的指导方针，本地化SPhP的光谱调谐和耦合机制在发挥作用。这项工作是不可或缺的声子极化激元为基础的应用程序，表面增强红外吸收光谱（SEIRA），多色探测器和热成像的发展。
Low-loss surface phonon polariton (SPhP) modes supported within polar dielectric crystals are a promising alternative to conventional, metal-based plasmonic systems for the realization of nanophotonic components. Here we show that monopolar excitations in 4H-silicon carbide nanopillar arrays exhibit an unprecedented stable efficiency even when the resonator filling fraction is varied by an order of magnitude. This provides a powerful mid-IR platform with excellent spectral tunability and strong field confinement. Combining IR spectroscopy measurements with full electrodynamic calculations, we elucidate the nature of the optical modes in these elongated subwavelength nanostructures by investigating their spectral behavior and local field dependence on the size and periodicity. The present study also gives a clear understanding and practical guidelines for the spectral tuning of localized SPhP and the coupling mechanisms at play. This work is integral with the development of phonon-polariton based applications for surface-enhanced infrared absorption spectroscopy (SEIRA), polychromatic detectors, and thermal imaging.