Related Experiment Video
Updated: Jan 12, 2026
08:54
Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
Published on: February 13, 2018
9.1K
Deterministic time rewinding of waves in time-varying media
Seulong Kim1, Kihong Kim2,3
1Research Institute of Basic Sciences, Ajou University, Suwon 16499, Korea.
Nanophotonics (Berlin, Germany)
|November 7, 2025
Summary
Scientists developed a robust time rewinding mechanism to fully restore waves to their original state using temporal modulation. This breakthrough enables complete wave reconstruction, advancing fields like secure information retrieval and programmable metamaterials.
Area of Science:
- Physics
- Materials Science
- Wave Dynamics
Background:
- Static material parameters limit control over wave dynamics.
- Temporal modulation offers advanced control over wave phenomena.
Purpose of the Study:
- Introduce and analyze a robust mechanism for complete wave time rewinding.
- Achieve deterministic reconstruction of the entire wave state, including amplitude and phase.
Main Methods:
- Engineered sequences of temporal modulations in electromagnetic and Dirac systems.
- Utilized impedance-matched/anti-matched bilayer structures and time-dependent vector potentials.
- Derived analytical conditions and validated through discrete and continuous modulation simulations.
Main Results:
- Demonstrated complete wave state restoration, surpassing partial recovery of existing methods.
- Achieved robust amplitude and phase restoration resilient to modulation complexity and asymmetry.
- Validated the mechanism in both electromagnetic and Dirac systems.
Conclusions:
- The developed time rewinding mechanism offers deterministic and complete wave reconstruction.
- This versatile platform supports applications in secure information retrieval, temporal cloaking, programmable metamaterials, and wave-based logic devices.
More Related Videos
Related Concept Videos
01:13Graphing the Wave Function
2.9K
Consider the wave equation for a sinusoidal wave moving in the positive x-direction. The wave equation is a function of both position and time. From the wave equation, two different graphs can be plotted.
2.9K
01:07Propagation of Waves
2.8K
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.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.8K
01:02Equations of Wave Motion
8.2K
Mathematically, the motion of a wave can be studied using a wavefunction. Consider a string oscillating up and down in simple harmonic motion, having a period T. The wave on the string is sinusoidal and is translated in the positive x-direction as time progresses. Sine is a function of the angle θ, oscillating between +A and −A and repeating every 2π radians. To construct a wave model, the ratio of the angle θ and the position x is considered.
8.2K
00:51Velocity and Acceleration of a Wave
4.7K
A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it.
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time....
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time....
4.7K
02:18Interference and Diffraction
51.6K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
51.6K
01:27Traveling Waves: Lossless Lines
461
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.
461