Modélisation 3 D des oscillations d'une onde lumineuse

Finally a perfect broadband and wide-angle absorber!

The plasmonic enables opticians and physicists to study collective oscillations of electrons that are inside a metal object illuminated by light. These electronic oscillations are in surface plasmon resonance or SPR when they are located at the interface between a material of negative and positive permittivity. Also, movies very thin metal make it possible to create surface waves at Long range called Epsilon-near-zero modes or ENZ.

3D modeling of the oscillations of a light wave
Source: phys.org

Recently, researchers from the Shanghai Institute of Optics and Fine Mechanics (SIOM) of the Chinese Academy of Sciences have developed the schematic of a broadband light absorber. This tunable band absorber works on the principle of undivided coupling Epsilon-near-zero (ENZ) and localized surface plasmon resonance (LSPR) modes.

This work represents real progress in the study of materials presenting both ENZ and plasmonic propertiessuch as cadmium oxide or titanium nitride.

In search of perfect absorption with ENZ materials

Optical absorption is essential in many linear and nonlinear optical applications. Indeed, in recent years, planar ENZ materials provided effective solutions for various perfect absorbers narrowband, wideband and tunable.

However, these planar ENZ materials face challenges. problems significant of polarization dependence and oblique incidence which limit their application. In order to obtain a perfect absorption of light, scientists then had the idea of combine ENZ films with metasurfaces. This technique would then make it possible to solve the polarization and angle dependence problems.

A perfect, wide-angle centimeter absorber

Of the chinese scientists have developed a perfect centimeter absorber model from a network of elliptical shells tin oxide and indium. Manufactured by low cost self-assembly technology, it goes into ENZ and LSPR mode at low wavelengths.

This device allowed researchers to correct the problems polarization dependence of the angle resonant exhibited by standard ENZ absorbers. Indeed, they succeeded in obtaining a light absorption over 98% between 1435 and 1680 nm during their experiments.

SOURCE: MIRAGNEWS

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