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Analysis of the 2D SAXS pattern of the colloidal dispersion of magnetotactic bacteria; the magnetic field was applied in horizontal direction (Θ = 0 • ). Left column: Polar plot of the scattering pattern in logarithmic scale (q max = 0.5 nm −1 ). Middle column: Extracted 2D correlation function P (r, ϕ) (r max = 150 nm). Right column: Correlation function along ϕ = 0 • and 90 • .

Determination of the 2D correlation functions by a SVD for a monodisperse ensemble of prolate rotational ellipsoids with an equatorial radius of 50 nm and a polar radius of 150 nm. (a) Ellipsoids are randomly oriented (isotropic ensemble). (b) Ellipsoids are aligned with their polar axis along Θ = 90 • (anisotropic ensemble). Left column: Polar plot of the scattering pattern in logarithmic scale (q max = 0.2 nm −1 ). Middle column: Extracted 2D correlation function P (r, ϕ) (r max = 400 nm). Right column: Correlation function along ϕ = 0 • and 90 • , and in (b) additionally the calculated cross sections for spheres with diameters of 100 nm and 300 nm, respectively.

https://nanoscalereslett.springeropen.com/articles/10.1186/s11671-018-2535-0

The simulation results reveal the feature of the system: changing the laser wavelength could lead to electric field redistribution, which avails the light energy focusing on the graphene surface. The reason for generating the phenomenon is due to the permittivity of the monolayer graphene under different wavelength conditions. At 633 nm, the permittivity of the monolayer graphene is 1.539, which expresses the property of dielectric.

In electromagnetism, a dielectric (or dielectric material or dielectric medium) is an electrical insulator that can be polarised by an applied electric field. When a dielectric material is placed in an electric field, electric charges do not flow through the material as they do in an electrical conductor, because they have no loosely bound, or free, electrons that may drift through the material, but instead they shift, only slightly, from their average equilibrium positions, causing dielectric polarisation.

Because of dielectric polarisation, positive charges are displaced in the direction of the field and negative charges shift in the direction opposite to the field (for example, if the field is moving parallel to the positive x axis, the negative charges will shift in the negative x direction). This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polarised, but also reorient so that their symmetry axes align to the field.

The study of dielectric properties concerns storage and dissipation of electric and magnetic energy in materials. Dielectrics are important for explaining various phenomena in electronics, optics, solid-state physics and cell biophysics.