Abstract:In this article, the plasmonic Talbot effect supported by a graphene monolayer is investigated theoretically when surface plasmon polaritons (SPPs) are excited on the graphene. The Talbot effect distance is studied by varying the chemical potential, wavelength and the period of grating. The Talbot distance increases with the period in a parabolic way, and exhibits the opposite trends with respect to the chemical potential and wavelength. Moreover, the full width at half maximum (FWHM) of the Talbot image is re… Show more
“…As shown in (Fig. 2 ), the effective wavelength is 168.2 nm 15 . Figure 2 A schematic of plasmonic Talbot effect formation on the surface of a metal array 16 .…”
Section: Plasmonic Talbot Effect In Metal Nanostructuresmentioning
confidence: 80%
“… Figure 2 A schematic of plasmonic Talbot effect formation on the surface of a metal array 16 . Figure 3 ( a ) structure when the graphene layer is surrounded by air dielectric on Silicon dioxide substrate, ( b ) a schematic of the graphene layer under the plasmonic Talbot effect 15 . …”
Section: Plasmonic Talbot Effect In Metal Nanostructuresmentioning
confidence: 99%
“… ( a ) structure when the graphene layer is surrounded by air dielectric on Silicon dioxide substrate, ( b ) a schematic of the graphene layer under the plasmonic Talbot effect 15 . …”
Section: Plasmonic Talbot Effect In Metal Nanostructuresmentioning
We report on the theoretical models of the plasmoincs Talbot effect in graphene nanostructure. The Talbot effect for the plasmonics applications in the IR range is theoretically studied and the respective Talbot effect for the novel advanced plasmonics structures are numerically investigated for the first time. It is shown that the metamaterial structures with periodic grating configuration represents a complex three-dimensional lattice of beamlet-like graphene plasmonics devices. The calculated results agree well with the experimental ones. The results obtained can be used to create and optimize the structures considering diffraction limit for a wide range of application areas. Effective focusing of plasmonic waves with exact focal spots and a subwavelength full width at half maximum can be obtained by using periodic graphene grating.
“…As shown in (Fig. 2 ), the effective wavelength is 168.2 nm 15 . Figure 2 A schematic of plasmonic Talbot effect formation on the surface of a metal array 16 .…”
Section: Plasmonic Talbot Effect In Metal Nanostructuresmentioning
confidence: 80%
“… Figure 2 A schematic of plasmonic Talbot effect formation on the surface of a metal array 16 . Figure 3 ( a ) structure when the graphene layer is surrounded by air dielectric on Silicon dioxide substrate, ( b ) a schematic of the graphene layer under the plasmonic Talbot effect 15 . …”
Section: Plasmonic Talbot Effect In Metal Nanostructuresmentioning
confidence: 99%
“… ( a ) structure when the graphene layer is surrounded by air dielectric on Silicon dioxide substrate, ( b ) a schematic of the graphene layer under the plasmonic Talbot effect 15 . …”
Section: Plasmonic Talbot Effect In Metal Nanostructuresmentioning
We report on the theoretical models of the plasmoincs Talbot effect in graphene nanostructure. The Talbot effect for the plasmonics applications in the IR range is theoretically studied and the respective Talbot effect for the novel advanced plasmonics structures are numerically investigated for the first time. It is shown that the metamaterial structures with periodic grating configuration represents a complex three-dimensional lattice of beamlet-like graphene plasmonics devices. The calculated results agree well with the experimental ones. The results obtained can be used to create and optimize the structures considering diffraction limit for a wide range of application areas. Effective focusing of plasmonic waves with exact focal spots and a subwavelength full width at half maximum can be obtained by using periodic graphene grating.
“…The proposed metamaterial absorber achieves broadband absorption using a novel two-dimensional graphene material. In the THz frequency range, the conductivity of graphene is related to the chemical potential and carrier scattering rate [24][25][26]. At room temperature, the scattering rate of charge carriers is determined by the quality of the material.…”
This paper proposes a tunable broadband terahertz absorber based on metamaterial graphene. The absorber consists of a monolayer of graphene, a dielectric layer, and a metal reflection backing. By adjusting the applied bias voltage, the unique properties of graphene are utilized to control its Fermi level. Simulation results indicate that the absorber has an absorption rate exceeding 70% between 4.2–4.8 THz, with a maximum absorption rate reaching 99.99%, and a sensitivity of 740 GHz/RIU. Compared to similar studies, this structure has significant advantages in sensitivity. Due to the symmetry of the unit structure, the absorber is insensitive to the incident angle. We applied the absorber to trimethylglycine concentration. Experimental results show that the designed absorber can accurately identify the concentration of trimethylglycine solution, detecting concentrations as low as 0.5%.
“…As a new branch of self‐imaging effect, the plasmonic Talbot effect breaks the diffraction limit 11 due to the excellent electromagnetic field confinement ability of plasmon 12 . The lengthwise distance and depth modulation of Talbot imaging is achieved by many structures such as an array of beam‐steered metamaterial leaky‐wave antennas, 13 a graphene monolayer 14 and a grating with uneven phase layer thickness 15 . However, the fixed transverse field distribution, owing to the inherent period and incident wavelength, makes it difficult to flexibly apply it to optical imaging.…”
Plasmonic Talbot imaging exhibits unique advantages over conventional Talbot imaging owing to the potential possibility of the miniaturization and integration of optoelectronic devices. However, the fixed structure parameters limit imaging manipulation, and the defects of masks also affect imaging integrity. Here, we propose a plasmonic Talbot imaging scheme based on the periodic metal nanopore arrays to achieve spatially tunable and self-healing performance evaluated by the FDTD method. The results reveal that the transverse field distribution at the Talbot planes can be offset in the 500 nm range with the incident light angle changed from 0°to 25°, exhibiting a tunability of the spatial position. Meanwhile, the randomly missing and misaligned defects of such periodic metal nanopore arrays can be effectively restored by the presence of low density or defects located at the center. The feasibility of spatial tunability and self-healing may provide an opportunity for optical imaging, nanolithography, and phase manipulation.
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