- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Topological Photonic Integrated Circuits Based on Valley Kink States
摘要： Valley pseudospin, a new degree of freedom in photonic lattices, provides an intriguing way to manipulate photons and enhance the robustness of optical networks. Here, topological waveguiding, refracting, resonating, and routing of valley-polarized photons in integrated circuits are experimentally demonstrated. Specifically, it is shown that at the domain wall between photonic crystals of different topological valley phases, there exists a topologically protected valley kink state that is backscattering-free at sharp bends and terminals. These valley kink states are further harnessed for constructing high-Q topological photonic crystal cavities with tortuously shaped cavity geometries. A novel optical routing scheme at an intersection of multiple valley kink states is also demonstrated, where light splits counterintuitively due to the valley pseudospin of photons. These results can not only lead to robust optical communication and signal processing, but also open the door for fundamental research of topological photonics in areas such as lasing, quantum photon-pair generation, and optomechanics.
关键词： silicon photonics,nanophotonic devices,photonic crystals,topological photonics,photonic integration
更新于2025-09-12 10:27:22
-
Giant plasmonically induced circular conversion dichroism in an anisotropic golden slit grating filled by a chiral medium
摘要： We report the giant plasmonically induced (PI) circular conversion dichroism in transmission (CCDT ) and PI-unconverted CD effect (unCCDR ) in re?ection from the golden slit grating ?lled by chiral medium (GSGCM). The CCDT and unCCDR are the differences between the off-diagonal elements in transmission matrix and diagonal elements in re?ection matrix, respectively, and originate from both the chirality and anisotropy. Our research indicates that the PI ? CCDT and PI-unCCDR in the plasmonic resonance wave band come from the coupling between the inherent chiroptical resonance of chiral medium and the plasmonic resonance of the golden slit grating, where the real part of chiral parameter ξ from chiral medium plays a main role in the coupling process. The isotropic chiral medium slab, the anisotropic chiral medium grating, the golden slit grating, and the GSGCM have been rigorously investigated in this work. Our research clearly reveals the difference of PI-chiroptical effect between the anisotropic and isotropic system, and will ?nd potential applications in biosensor and nanophotonic devices.
关键词： golden slit grating,biosensor,plasmonically induced circular conversion dichroism,nanophotonic devices,anisotropy,chiral medium
更新于2025-09-12 10:27:22
-
[Springer Series in Materials Science] Introduction to Isotopic Materials Science Volume 248 || Energy Band Structure
摘要： Optical probing and manipulation of electron quantum states in isotope-mixed compounds at the nanoscale are key to developing future nanophotonic devices, which are capable of ultrafast and low-power operation. Before beginning a general discussion on the application of isotopic materials science, it is helpful to have the knowledge of the electronic band structure used in materials. The modern view of solid-state physics is based on the presentation of elementary excitations having mass, quasi-impulse, and electrical charge. The base of such view of solid is ideal gas, which described the behavior of the system, e.g., noninteracting electrons. Such an approach to model of elementary excitations as a suitable model for the application of the quantum mechanics for the solution of solid-state physics task. In this chapter, some peculiarities of isotopic materials science will be considered by taking into account the dependence of the properties of elementary excitations on the isotope effect. It is illustrated when the dimensions of a solid are reduced to the size of the characteristic length of electrons in the isotope-mixed materials (de Broglie wavelength, localization length), new physical properties due to quantum effects become apparent. Our intention has been to physics of low-dimensional isotope-based compounds and quantum devices would built up to the treatment of those new electronic, transport and optical properties.
关键词： nanophotonic devices,isotope effect,electronic band structure,solid-state physics,quantum effects,isotope-mixed compounds,quantum mechanics
更新于2025-09-09 09:28:46