Related Experiment Video
Updated: Feb 8, 2026
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.7K
Dynamic Janus Metasurfaces in the Visible Spectral Region
Ping Yu1, Jianxiong Li1, Shuang Zhang2
1Max Planck Institute for Intelligent Systems , Heisenbergstrasse 3 , 70569 Stuttgart , Germany.
Nano Letters
|June 22, 2018
Summary
This study introduces a dynamic Janus metasurface using magnesium and gold nanorods. This novel design allows for tunable optical properties in the visible spectrum, enabling advanced functionalities like beam steering and holographic encryption.
Area of Science:
- Plasmonics
- Metasurfaces
- Nanophotonics
Background:
- Janus monolayers break structural symmetry, inspiring Janus metasurfaces with asymmetric meta-atom arrangements.
- Current Janus metasurfaces are static, limiting their adaptability and information security.
Purpose of the Study:
- To present a dynamic Janus metasurface scheme operating in the visible spectral region.
- To enable tunable optical functionalities through reversible control of metasurface properties.
Main Methods:
- Designed a metasurface with super unit cells containing magnesium and gold nanorods.
- Utilized hydrogenation/dehydrogenation of magnesium nanorods to dynamically tune effective pixels.
- Explored orthogonal orientation of nanorods for counter-pixel functionality.
Main Results:
- Demonstrated reversible control over Janus metasurface properties via chemical stimulus.
- Achieved dynamic tunability in the visible frequency range.
- Showcased potential for novel optical elements with switchable functions.
Conclusions:
- The proposed dynamic Janus metasurface offers unprecedented control over light manipulation.
- This platform enables advanced optical functionalities such as beam steering, bifocal lensing, and holographic encryption.
- The reversible nature of the metasurface opens new avenues for reconfigurable optical devices.
Related Concept Videos
01:03IR Frequency Region: Fingerprint Region
2.0K
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
2.0K
02:40The Eukaryotic Promoter Region
18.9K
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
18.9K
02:40The Eukaryotic Promoter Region
4.0K
4.0K
01:17Region of Convergence
957
The z-transform is a powerful mathematical tool used in the analysis of discrete-time signals and systems. It is a crucial tool in the analysis of discrete-time systems, but its convergence is limited to specific values of the complex variable z. This range of values, known as the Region of Convergence (ROC), is fundamental in determining the behavior and stability of a system or signal. The ROC defines the region in the complex plane where the z-transform converges, which can take various...
957
01:12Regional Terms
16.1K
Regional terms describe anatomy by dividing the body parts into different regions that contain structures involved in contributing similar functions. Using these terms helps increase the accurate description and identification of the particular region of interest or region affected by the disease.
Primarily, the human body has two major regions, the axial and appendicular regions. The axial region comprises regions from the head to the abdomen and makes up the central body axis. In contrast,...
Primarily, the human body has two major regions, the axial and appendicular regions. The axial region comprises regions from the head to the abdomen and makes up the central body axis. In contrast,...
16.1K
02:20Dynamic Equilibrium
63.0K
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
63.0K