Energy determines the ability of matter to work. However, in the given environment, the real usefulness to perform work is determined by exergy. This study covers not only solar, but also any monochromatic thermal rad...Energy determines the ability of matter to work. However, in the given environment, the real usefulness to perform work is determined by exergy. This study covers not only solar, but also any monochromatic thermal radiation. The value of such radiation was determined by its exergy and the ratio of its exergy-to-energy. A novelty in this work is to demonstrate by means of exergy that the usefulness of thermal polychromatic radiation can be increased by its dispersion to monochromatic radiation. This effect is the greater, the lower the temperature of the radiation. Analogies of this effect to the exergetic effect of gas separation have been indicated. The effect of the increase in exergy in the process of radiation dispersion was interpreted by means of a cylinder-piston system that explains this effect with the influence of environmental radiation. The concept of quasi-monochromatic and cumulated radiation was introduced into dispersion considerations and the change in the energetic, entropic and environmental components of the exergy of radiation beams was analyzed. Considerations were illustrated with appropriate examples of calculations considering dispersion of high-temperature radiation, such as extraterrestrial solar radiation and dispersion of low-temperature radiation from water vapor.展开更多
Symmetry plays a fundamental role in topological photonic crystals, and topological phase transitions induced bydisorder have also been extensively explored in recent years. However, in this work, we find anisotropy c...Symmetry plays a fundamental role in topological photonic crystals, and topological phase transitions induced bydisorder have also been extensively explored in recent years. However, in this work, we find anisotropy can beinduced by reducing symmetry in a C_(2v) symmetry triangular photonic crystal. We investigate that anisotropyinducedinterfaces profoundly affect edge states and enable the realization of slow light dispersion. Numericalsimulations reveal a transition from gapless chiral edge modes to gapped flat band dispersion. Furthermore, weobserve higher-order corner states in corner structures constructed by anisotropic interfaces. The corner states canbe induced and localized at different lattice positions, thereby realizing multiple types of higher-order topologicalstates. We demonstrate the significance of anisotropic geometry in topological photonics. These findings opennew possibilities for steering wave transport in multiple dimensions and offer, to our knowledge, a novel researchperspective on the transformation of topological states induced by anisotropic lattices.展开更多
文摘Energy determines the ability of matter to work. However, in the given environment, the real usefulness to perform work is determined by exergy. This study covers not only solar, but also any monochromatic thermal radiation. The value of such radiation was determined by its exergy and the ratio of its exergy-to-energy. A novelty in this work is to demonstrate by means of exergy that the usefulness of thermal polychromatic radiation can be increased by its dispersion to monochromatic radiation. This effect is the greater, the lower the temperature of the radiation. Analogies of this effect to the exergetic effect of gas separation have been indicated. The effect of the increase in exergy in the process of radiation dispersion was interpreted by means of a cylinder-piston system that explains this effect with the influence of environmental radiation. The concept of quasi-monochromatic and cumulated radiation was introduced into dispersion considerations and the change in the energetic, entropic and environmental components of the exergy of radiation beams was analyzed. Considerations were illustrated with appropriate examples of calculations considering dispersion of high-temperature radiation, such as extraterrestrial solar radiation and dispersion of low-temperature radiation from water vapor.
基金National Natural Science Foundation of China(12374296,62401474)Key Research and Development Program of Shaanxi Province(2023-YBGY-247,2024GXZDCYL-01-31)+1 种基金Basic and Applied Basic Research Foundation of Guangdong Province(2024A1515011725)Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(CX2024029)。
文摘Symmetry plays a fundamental role in topological photonic crystals, and topological phase transitions induced bydisorder have also been extensively explored in recent years. However, in this work, we find anisotropy can beinduced by reducing symmetry in a C_(2v) symmetry triangular photonic crystal. We investigate that anisotropyinducedinterfaces profoundly affect edge states and enable the realization of slow light dispersion. Numericalsimulations reveal a transition from gapless chiral edge modes to gapped flat band dispersion. Furthermore, weobserve higher-order corner states in corner structures constructed by anisotropic interfaces. The corner states canbe induced and localized at different lattice positions, thereby realizing multiple types of higher-order topologicalstates. We demonstrate the significance of anisotropic geometry in topological photonics. These findings opennew possibilities for steering wave transport in multiple dimensions and offer, to our knowledge, a novel researchperspective on the transformation of topological states induced by anisotropic lattices.
