Due to their unusual features in condensed matter physics and their applicability in optical and optoelectronic applications, three-dimensional Dirac semimetals (3D DSMs) have garnered substantial interest in recent years. In contrast to monolayer graphene, 3D DSM exhibits linear band dispersion despite its macroscopic thickness. Therefore, being a bulk material, it is easy to make nanostructures with 3D DSM, just as one normally does with metals such as gold and silver. Among 3D DSMs, cadmium arsenide (Cd3As2) is quite famous and considered an excellent 3D DSM due to its chemical stability in air and extraordinary optical response. In this review, advances in 3D DSM Cd3As2 fabrication techniques and recent progress in the photonics of 3D DSM Cd3As2 are given and briefly reviewed. Various photonic features, including linear and nonlinear plasmonics, optical absorption, optical harmonic generation, and ultrafast dynamics, have been explored in detail. It is expected that Cd3As2 would share an excellent tunable photonic response like graphene. We envision that this article may serve as a concise overview of the recent progress of photonics in 3D DSM Cd3As2 and provides a compact reference for young researchers.
Graphene nanoribbons (GNRs) are envisioned to play an important role in improving confinement of surface plasmon resonance. Here, a coupled graphene-cavity-waveguide (GCW) system is proposed to investigate the characteristics of the resonant modes with finite difference time domain (FDTD) method. It is found that the surface plasmon characteristics can be modulated with the change of geometrical parameters of the structure and physical parameters of graphene. The resonant wavelength is sensitive to the Fermi level; and the resonant depth can be adjusted by the altering of carrier mobility. Moreover, the quality factor can be affected by the separation of cavity-cavity. The proposed GCW coupling system has potential applications in graphene-based integrated nanophotonic devices, optical filters, slow light and other active photonic devices.
The paper proposes a graphene/metal sensing film assisted optical fiber as a graphene plasmonic waveguide biosensor. The enhanced graphene surface plasmon can promote the tunable sensitivities in both intensity and wavelength. The effective mode index, leakage loss and effective mode area properties for graphene/metal film assisted optical fiber are studied. There is a big interaction between raphene/metal sensing film and optical fiber in the region round wavelength 590nm. Graphene based hybrid plasmonic waveguide sensor can realize the highly sensitive, highly integrated, flexible, and miniaturized prospect in sensing application.
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