Momentum-space imaging spectroscopy for the study of nanophotonic materials

动量空间光谱成像技术在微纳光子学材料研究中的应用

The novel phenomena in nanophotonic materials, such as the angle-dependent reflection and negative refraction effect, are closely related to the photonic dispersions EepT. EepT describes the relation between energy E and momentum p of photonic eigenmodes, and essentially determines the optical properties of materials. As EepT is defined in momentum space(k-space), the experimental method to detect the energy distribution, that is the spectrum, in a momentum-resolved manner is highly required. In this review, the momentum-space imaging spectroscopy(MSIS) system is presented, which can directly study the spectral information in momentum space. Using the MSIS system, the photonic dispersion can be captured in one shot with high energy and momentum resolution. From the experimental momentumresolved spectrum data, other key features of photonic eigenmodes, such as quality factors and polarization states, can also be extracted through the post-processing algorithm based on the coupled mode theory. In addition, the interference configurations of the MSIS system enable the measurement of coherence properties and phase information of nanophotonic materials, which is important for the study of light-matter interaction and beam shaping with nanostructures. The MSIS system can give the comprehensive information of nanophotonic materials, and is greatly useful for the study of novel photonic phenomena and the development of nanophotonic technologies.

纳米尺度效应使纳米材料具有独特的磁、光、热和电性能,在催化、生物医学传感器、能量存储和转换等领域得到了广泛的研究.目前常用的合成方法都是基于热辐射的体相加热过程,如传统的水热和煅烧等.与传统加热方式不同,非热辐射加热方法具有局部加热的特点.为此,本文总结了合成纳米材料的各种非辐射加热方法,包括微波加热、感应加热、焦耳加热、激光加热和电子束加热,并对各种非热辐射加热方法合成纳米材料的优缺点进行了比较和讨论.最后,展望了非辐射加热法潜在合成纳米材料的发展前景和面临的挑战.