Energy-momentum cathodoluminescence spectroscopy of dielectric nanostructures
Energy-momentum cathodoluminescence spectroscopy of dielectric nanostructures
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DOI：
10.1021/acsphotonics.7b01404
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发表时间：
2018-01
期刊：
影响因子：
7
通讯作者：
S. Mignuzzi;Mónica Mota;T. Coenen;Yi Li;A. Mihai;P. Petrov;R. Oulton;S. Maier;R. Sapienza
中科院分区：
文献类型：
--
作者：
S. Mignuzzi;Mónica Mota;T. Coenen;Yi Li;A. Mihai;P. Petrov;R. Oulton;S. Maier;R. Sapienza
精确的局部光态密度（LDOS）知识是理解纳米光子系统和器件的基础。完整的LDOS映射需要能量、动量和空间分辨率，因此非常需要能够同时访问LDOS组件的通用测量方法。在这里，我们探讨了一种方式的阴极发光光谱能够解决，在单次收购，分散在能量和动量的辐射LDOS。我们进行测量的氮化钛衍射光栅，散装二硫化钼，和硅，以证明该技术可以探测和解开的相干和非相干阴极射线发光信号的分散。所提出的方法提高了阴极发光光谱的亚波长设计和优化的倒易空间中的纳米光子器件的一个通用工具。
Precise knowledge of the local density of optical states (LDOS) is fundamental to understanding nanophotonic systems and devices. Complete LDOS mapping requires resolution in energy, momentum, and space, and hence a versatile measurement approach capable of providing simultaneous access to the LDOS components is highly desirable. Here, we explore a modality of cathodoluminescence spectroscopy able to resolve, in single acquisitions, the dispersion in energy and momentum of the radiative LDOS. We perform measurements on a titanium nitride diffraction grating, bulk molybdenum disulfide, and silicon to demonstrate that the technique can probe and disentangle the dispersion of coherent and incoherent cathodoluminescence signals. The approach presented raises cathodoluminescence spectroscopy to a versatile tool for subwavelength design and optimization of nanophotonic devices in the reciprocal space.