Related Experiment Video
Updated: Oct 20, 2025
08:48
Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
Published on: September 25, 2020
5.9K
Multistate Nonvolatile Metamirrors with Tunable Optical Chirality
Yijia Huang1, Tianxiao Xiao2, Zhengwei Xie1
1Laboratory of Micro-Nano Optics, College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, P. R. China.
ACS Applied Materials & Interfaces
|September 14, 2021
Summary
This study introduces a tunable metamirror using phase-change materials for versatile infrared light control. The novel device offers four distinct optical functionalities, enabling advanced applications in sensing and imaging.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Conventional mirrors offer limited electromagnetic control.
- Metamirrors provide enhanced electromagnetic manipulation but typically have fixed functionalities.
- Achieving active control in metamirrors remains a significant challenge.
Purpose of the Study:
- To propose and demonstrate a multistate metamirror with tunable functionalities.
- To utilize the phase-change material Germanium-Antimony-Tellurium (Ge2Sb2Te5 or GST) for active electromagnetic control.
- To achieve four distinct optical functionalities in the infrared region using temperature-activated phase transitions.
Main Methods:
- Fabrication of a metamirror utilizing the nonvolatile phase-change material GST.
- Exploitation of the temperature-activated phase transition of GST to alter its crystallinity.
- Characterization of the metamirror's optical response across different crystalline states.
Main Results:
- The metamirror demonstrated four distinct functionalities: right-handed circular polarization chiral mirror, narrowband achiral mirror, left-handed circular polarization chiral mirror, and broadband achiral mirror.
- The observed functionalities are attributed to the construction or cancellation of extrinsic two-dimensional chirality.
- Experimental results closely matched simulated predictions, validating the concept.
Conclusions:
- A multifunctional and tunable metamirror based on GST was successfully proposed and experimentally verified.
- The ability to switch between multiple optical states opens new avenues for advanced optical devices.
- This tunable metamirror holds promise for diverse applications including sensing, spectroscopy, analytical chemistry, and imaging.
Related Concept Videos
02:25Chirality
27.2K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
27.2K
02:25Molecules with Multiple Chiral Centers
13.8K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
13.8K
02:52Stereoisomerism
12.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
12.7K
02:30Chirality in Nature
14.8K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
14.8K
02:24Properties of Enantiomers and Optical Activity
19.1K
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
19.1K