In recent years, MXene materials have found great applications in fields such as photonics and nonlinear optics due to their special physical properties. Here, the non-linear absorption properties of vanadium carbide/silver (V2C/Ag) nanoparticle composites at different wavelengths (450-600 nm) are investigated using Z-scan techniques. Experimental and computational results show that the material has strong saturable absorption (SA) properties, and the SA intensity increases with decreasing wavelength. This research provides new applicable materials for laser technology.
In this paper, a dynamically tunable terahertz absorber is proposed. The absorber consists of a gold thin film, TOPAS and a graphene patterned structure. The absorption properties of the structure was investigated theoretically by using Time-Domain Finite-Difference (FDTD) method. The results show that the absorber can achieve a broadband and a narrowband absorption. Additionally, the amplitude of the two absorption bands can be adjusted. By adjusting the Fermi Energy (EF) of graphene from 0.1 eV to 1.2 eV, the absorbance of broadband absorption can change from 72% to 95%, and the absorbance of narrowband absorption changes from 40% to 97%. The design provides a new avenue for the development of terahertz absorption and modulation devices.
We propose a metal-insulator-metal (MIM) waveguide structure in which the plasma-induced transparency (PIT) effect is based. Using the finite-difference in time domain (FDTD) method, the designed structure was simulated in two dimensions. It obtains both narrowband PIT peaks, both with more than 90% absorption. In addition, we use the Kerr material filled in the cavity for tuning, and we can find that the transmission spectrum shifts with increasing pump light intensity. The proposed structure can be applied to filter. The proposed structure has important prospects for application in integrated optical devices.
A metasurface polarization conversion device is proposed by etching a specially shaped hole in the center of a single disk of graphene. The polarization converter can achieve the cross-polarization conversion function from x to y in the midinfrared band, with three polarization conversion rate peaks and a maximum conversion efficiency of more than 98%. By adjusting the chemical potential of graphene, the operating frequency can be dynamically adjusted to ensure that the conversion efficiency of two operating bands is above 90% and that of three operating bands is above 80%. Based on the above performance, the designed polarization conversion device can be potentially applied in the field of optical polarization control.
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