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Chirality

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.
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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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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...

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Related Experiment Video

Updated: Sep 29, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Perovskite metasurfaces with large superstructural chirality.

Guankui Long^1,2, Giorgio Adamo^1,3, Jingyi Tian^1,3

¹Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.

Nature Communications

|March 24, 2022

Summary

This summary is machine-generated.

Researchers developed novel all-dielectric perovskite metasurfaces for enhanced chirality. This planar nanostructure design overcomes limitations in hybrid perovskite synthesis, enabling advanced chiral photonic devices.

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Published on: September 25, 2020

Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Synthesizing hybrid perovskites with significant chirality is challenging due to size mismatches and weak light interactions.
Existing methods struggle to achieve the desired chiral properties in perovskite materials.

Purpose of the Study:

To design and realize all-dielectric perovskite metasurfaces with giant superstructural chirality.
To overcome the limitations of previous hybrid perovskite synthesis attempts.
To establish a spectral link between near- and far-field chirality.

Main Methods:

Adoption of a planar nanostructure design for perovskite metasurfaces.
Tuning electric and magnetic multipole moments of resonant chiral metamolecules.
Utilizing simulations to predict performance of larger area metasurfaces.

Main Results:

Achieved giant superstructural chirality in all-dielectric perovskite metasurfaces.
Demonstrated a direct spectral correspondence between near- and far-field chirality.
Obtained a large anisotropy factor of 0.49 and circular dichroism of 6350 mdeg.
Simulations indicate potential for even higher optical activity in larger metasurfaces.

Conclusions:

The planar nanostructure design effectively overcomes limitations in synthesizing chiral perovskites.
Engineered perovskite metasurfaces show significant potential for high optical activity.
This approach paves the way for advanced perovskite-based chiral photonic, optoelectronic, and spintronic devices.