The Brewster Effect

 


Brewster reflectionless effect is one of the most important discoveries in wave manipulation. 

The first experiments were limited to isotopic materials. When metamaterials were discovered, the phenomenon expanded into anisotropic materials.

Researchers were able to show the anomalous Brewster effect in metamaterials. This increased the number of degrees of freedom. 

In substances without magnetic responses, the Brewster effect applies exclusively to transverse-magnetic waves. These waves are called TM or p-wave polarization.

Building on similarities between TM mode and 2D acoustics, the Brewster effect with zero reflection  was recently  demonstrated by using acoustic metamaterials.

The research was published last month in the journal Science Bulletin. 

Researchers have demonstrated a universal theory. They matched the continuous boundary conditions and studied the relationship between the reflection coefficient and its parameters. It is thought that a precise method to confirm zero reflection was discovered. 

Because of this, researchers introduced intrinsic loss into the permittivity tensors. They showed a way to achieve asymmetric vortex transmission. 

Researchers were inspired by the orientation of electromagnetic behaviors and water rotators. They used 3D printing technology and photosensitive resins to observe asymmetric vortex transmission in an acoustic wave.

The testing of the angular Brewster effect enables the asymmetric vortex transmission for both electromagnetic and acoustic waves. This is because of the combined influence of rotation angle and intrinsic loss.

This design works on broadband frequencies. It also breaks the symmetry between (+) and (-) charges. This creates more degrees of freedom for future implementations of (OAM) orbital angular movement projects. 

This new device has great promise for a huge array of applications. These extend far beyond optical and acoustic waves to include elastic waves, water waves and even some dynamic fields! 

The study of asymmetric transmission and near zero reflection of OAM will improve data transmission, speed and quality. It will also alleviate signal loss and distortion. 

This study is from the Xiamen University and the Quantum Science Center of Guangdong - Hong Kong Maca Greater Bay Area. The theory presented is a universal theory of angular Brewster effect. It enables control of both momentum and orbit angular movements. 

This study will pave the way for more reliable communication networks in the near future! 

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