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Related Concept Videos

Chirality02:25

Chirality

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...
Chirality in Nature02:30

Chirality in Nature

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. The...
Stereoisomerism02:52

Stereoisomerism

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...
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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,...
Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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...

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Updated: Jun 8, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

A chirality switching device designed with transformation optics.

Yuan Shen1, Kun Ding, Wujiong Sun

  • 1State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai, 200433, China.

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a novel chirality switching device. The device renders hidden objects invisible while reversing their chirality for far-field observers.

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Area of Science:

  • Physics
  • Optics
  • Metamaterials

Background:

  • Chirality is a fundamental property in physics and chemistry.
  • Controlling chirality, especially for hidden objects, presents significant challenges.
  • Existing methods like perfect mirrors create reversed images but do not achieve invisibility.

Purpose of the Study:

  • To design a device capable of switching the chirality of a hidden object.
  • To render the object invisible to an observer at the far field.
  • To demonstrate the device's functionality using numerical simulations.

Main Methods:

  • Utilizing transformation optics theory for device design.
  • Developing a device structure to manipulate electromagnetic wave interactions.
  • Conducting numerical simulations in both 2D and 3D spaces.

Main Results:

  • The designed device successfully reverses the chirality of a hidden object (left-handed to right-handed).
  • The object remains completely invisible to a far-field observer.
  • Simulations confirm the device's effectiveness in both two- and three-dimensional scenarios.

Conclusions:

  • A novel invisibility and chirality switching device has been successfully designed based on transformation optics.
  • The device offers a unique capability to hide objects while altering their perceived chirality.
  • This work opens new avenues for cloaking and chiral manipulation technologies.