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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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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,...
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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...
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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.
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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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Group Polarization01:01

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Hyperpolarized Xenon for NMR and MRI Applications
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Extremize Optical Chiralities through Polarization Singularities.

Weijin Chen1, Qingdong Yang1, Yuntian Chen1,2

  • 1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.

Physical Review Letters
|July 9, 2021
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Summary
This summary is machine-generated.

This study explores maximizing and minimizing optical chirality in photonic structures by analyzing radiation patterns and polarization singularities. We reveal how specific incident wave directions can lead to extreme chiral responses, offering new control over optical properties.

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Area of Science:

  • Optics
  • Photonics
  • Condensed Matter Physics

Background:

  • Chiral optical effects are typically quantified independently of incident wave direction or averaged over all orientations.
  • Extremizing optical chirality (maximization/minimization) with respect to incident or structural orientation has not been systematically explored.
  • Understanding direction-dependent chiral responses is crucial for advanced photonic applications.

Purpose of the Study:

  • To systematically investigate the extremization of optical chirality in open photonic structures.
  • To explore the relationship between quasinormal modes, polarization singularities, and chiral responses.
  • To develop a framework for analyzing both intrinsic and extrinsic optical chiralities in various structures.

Main Methods:

  • Analysis of quasinormal modes and far-field radiation polarization singularities.
  • Investigation of optical responses for specific incident wave directions, including circular, linear, and elliptical polarizations.
  • Application of the framework to finite and infinite structures, encompassing both intrinsic and extrinsic chiralities.

Main Results:

  • Existence of singularity directions on the momentum sphere yielding circularly or linearly polarized radiation.
  • Demonstration of ideal maximization and minimization of optical chirality by incident plane waves along these directions.
  • Unveiling a subtle equality between a Stokes parameter and circular dichroism for elliptical polarizations, revealing potential for zero or opposite chirality.

Conclusions:

  • A unified framework merging chiral and singular optics is established for analyzing optical chirality extremization.
  • Reciprocity principles enable ideal chiral response control via specific incident wave directions.
  • The findings offer new possibilities for interdisciplinary research in chiral and singular optics and their applications.