关键词: 太赫兹/
表面极化激元/
二维材料/
近场光学
English Abstract
Terahertz surface polaritons
Zhang Xue-Jin,Lu Yan-Qing,
Chen Yan-Feng,
Zhu Yong-Yuan,
Zhu Shi-Ning
1.Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
Fund Project:Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303700) and the National Natural Science Foundation of China (Grant Nos. 11621091, 11374150, 11274159).Received Date:28 June 2017
Accepted Date:13 July 2017
Published Online:05 July 2017
Abstract:Enormous efforts have been made to manipulate the light-matter interactions, especially in sub-diffraction-limited space, leading to miniaturized and integrated photonic devices. In physics, an elementary excitation, called polariton, which is the quantum of the coupled photon and polar elementary excitation wave field, underlies the light-matter interaction. In the dispersion relation, polaritons behave as anti-crossing interacting resonance. Surface polaritons provide ultra-confinement of electromagnetic field at the interface, opening up possibilities for sub-diffraction-limited devices, and various field enhancement effects. In the electromagnetic spectra, terahertz (THz) regime was called THz gap before the 1990s, but has now been thrust into the limelight with great significance. This review is devoted to the emerging but rapidly developing field of sub-diffraction-limited THz photonics, with an emphasis on the materials and the physics of surface polaritons. A large breadth of different flavours of materials and surface polaritonic modes have been summarized. The former includes metallic, dielectric, semiconductor, two-dimensional (2D) materials, metamaterials, etc.; the latter covers surface phonon-, plasmon-, and hybrid polaritons. In the THz regime, 2D surface plasmon polariton and artificial surface phonon polaritons offer more attractive advantages in ability to obtain low-loss, tunable, ultracompact light-matter modes.
Keywords: terahertz/
surface polaritons/
two-dimensional materials/
near-field optics
