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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

Theory of Metallic Conduction

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Perfect anomalous reflection using a compound metallic metagrating.

Mahdi Rahmanzadeh, Amin Khavasi

|June 19, 2020

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This summary is machine-generated.

Compound metallic gratings offer efficient wavefront manipulation without complex fabrication. This study introduces an analytical method for designing anomalous reflection with near-unitary efficiency, showing great potential for terahertz and microwave applications.

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Area of Science:

Electromagnetics
Optics
Materials Science

Background:

Metasurfaces face limitations in efficiency and fabrication complexity for wavefront manipulation.
Metagratings present a novel approach to wavefront control with improved performance.
Anomalous reflection requires precise control over diffracted orders.

Purpose of the Study:

To propose a compound metallic grating for efficient anomalous reflection.
To develop an analytical method for predicting the electromagnetic response of compound metallic gratings.
To design a high-efficiency anomalous reflector for TM-polarized waves.

Main Methods:

Development of closed-form analytical expressions for reflection coefficients.
Analysis of electromagnetic response based on grating geometry and asymmetry.
Verification of the analytical method using full-wave simulations.

Main Results:

An analytical method for compound metallic gratings is presented and validated.
A perfect anomalous reflector with 99.9% efficiency for TM waves is designed.
A multi-element grating achieves reflection below 30° at normal incidence.

Conclusions:

Compound metallic gratings provide a viable and efficient alternative for wavefront manipulation.
The analytical method enables precise design of anomalous reflection devices.
High efficiencies and versatile beam steering capabilities highlight potential in microwave and terahertz applications.