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Reflection of Waves

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...

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Related Experiment Video

Updated: Sep 30, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Water-based metasurface with continuously tunable reflection amplitude.

Xiaoxue Tan, Juan Chen, Jianxing Li

|March 18, 2022

Summary

This summary is machine-generated.

This study introduces a novel water-based metasurface with tunable reflection properties. This adjustable metasurface can switch between reflection and absorption states for broadband electromagnetic applications.

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Related Experiment Videos

Last Updated: Sep 30, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Published on: September 25, 2020

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Area of Science:

Metamaterials and Nanophotonics
Electromagnetic Metasurfaces
Water-based Tunable Devices

Background:

Metasurfaces offer unique electromagnetic properties.
Tunable metasurfaces are crucial for adaptive electromagnetic devices.
Controlling electromagnetic waves using liquid-based structures presents challenges.

Purpose of the Study:

To propose and demonstrate a water-based metasurface with adjustable reflection amplitude.
To investigate the broadband electromagnetic response of the proposed metasurface.
To explore potential applications in electromagnetic shielding.

Main Methods:

Fabrication of a water-based metasurface using a transparent substrate and a double-ring resistive film.
Systematic variation of water height within the container (0 mm to 0.5 mm).
Electromagnetic characterization across a broadband frequency range (0.1 GHz to 30 GHz).

Main Results:

Achieved an adjustable reflection amplitude ranging from -2 dB to -12 dB.
Demonstrated a transition from strong reflection to absorption by increasing water height.
Observed good agreement between simulation and experimental test results.
Confirmed transparency to visible light, enabling window applications.

Conclusions:

The proposed water-based metasurface provides effective control over reflection amplitude.
The tunable nature and broadband operation make it suitable for dynamic electromagnetic applications.
Its transparency and tunability open possibilities for electromagnetic shielding in transparent surfaces like aircraft windows.