Related Experiment Video
Updated: Jun 5, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.2K
Multitask bidirectional digital coding metasurface for independent controls of multiband and full-space
Liang Wei Wu1,2, Hui Feng Ma1,2, Yue Gou1,2
1State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, 210096, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
This study introduces a multiband bidirectional digital coding metasurface capable of performing diverse functions across multiple frequency bands for both front and back electromagnetic wave incidence. This novel metasurface enables advanced applications like holographic imaging and vortex-beam forming.
Area of Science:
- Metamaterials and Nanophotonics
- Electromagnetics and Wave Manipulation
Background:
- Traditional metasurfaces often operate at a single frequency band.
- Controlling electromagnetic waves bidirectionally and across multiple frequencies presents a significant challenge.
Purpose of the Study:
- To propose and demonstrate a multiband bidirectional digital coding metasurface.
- To achieve distinct functionalities for electromagnetic waves incident from both sides of the metasurface across multiple frequency bands.
Main Methods:
- Design and fabrication of a dual-band full-space metasurface.
- Implementation of a six-band full-space metasurface.
- Integration of functions including reflection, transmission, holographic imaging, and vortex-beam forming.
- Simulations and experimental measurements for performance verification.
Main Results:
- A dual-band metasurface successfully demonstrated integrated functions of reflection, transmission, holographic imaging, and vortex-beam forming.
- A six-band metasurface achieved independent holographic imaging functions at different frequencies.
- Simulated and measured results showed excellent agreement, validating the proposed design.
Conclusions:
- The developed multiband bidirectional digital coding metasurface offers versatile, independent control of electromagnetic waves.
- This technology paves the way for advanced multifunctional devices in various electromagnetic applications.
Related Concept Videos
01:30Electromagnetic Waves
8.5K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
8.5K
01:10Dual Nature of Electromagnetic (EM) Radiation
1.9K
Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
1.9K
01:15Standing Electromagnetic Waves
1.5K
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
1.5K
01:30Electromagnetic Fields
2.1K
Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of...
However, the observation of...
2.1K
01:10Generating Electromagnetic Radiations
2.6K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
2.6K
01:30Plane Electromagnetic Waves I
3.6K
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed...
The EM field is assumed...
3.6K