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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Multifunctional graphene metasurface to generate and steer vortex waves.

Mengyu Wang^1,2, Qingsheng Zeng³, Li Deng⁴

¹College of Electronic Science and Technology, Shenzhen University, Shenzhen, 518060, China.

Nanoscale Research Letters

|November 14, 2019

Summary

Researchers developed a novel multifunctional graphene metasurface capable of generating and steering vortex waves. This tunable graphene device offers a new pathway for reconfigurable electronic applications.

Keywords:

Graphene Metasruface of multi-functions Vortex wave

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Area of Science:

Materials Science
Metamaterials
Nanotechnology

Background:

Graphene, a 2D material, offers unique properties for advanced applications.
Graphene metasurfaces provide dynamic wavefront control and multifunctional capabilities.

Purpose of the Study:

To propose a novel multifunctional graphene metasurface design.
To combine vortex wave generation and steering functionalities in a single device.

Main Methods:

Design of a graphene metasurface composed of independently controlled reflective unit cells.
Utilizing variations in unit cell size and gate voltage to tune reflective properties.

Main Results:

Demonstrated the capability to generate and steer vortex waves using the designed graphene metasurface.
Validated the multifunctional potential through simulation of reflective properties.

Conclusions:

Established a design methodology for multifunctional graphene metasurfaces.
Highlighted the tunability of graphene for creating reconfigurable devices.