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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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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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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...
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Spiral Chiral Metamaterial Structure Shape for Optical Activity Improvements.

Kohei Maruyama1, Miyako Mizuna2, Takuya Kosuge3

  • 1School of Informatics and Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan.

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|June 28, 2023
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Summary

We developed a spiral structure model for enhanced optical response. Uniformly deformed structures showed improved circular dichroism, applicable to miniaturized metamaterials.

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GHzchiral metamateriallaser writingoptical activityspiral shape

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Area of Science:

  • Metamaterials Science
  • Optical Engineering
  • Structural Mechanics

Background:

  • Spiral structures are key for large optical responses.
  • Understanding deformation is crucial for optimizing optical performance.
  • Large-scale prototypes facilitate rapid experimental validation.

Purpose of the Study:

  • To develop and validate a structural mechanics model for deformed planar spiral structures.
  • To investigate the relationship between structural uniformity and optical response in GHz band spiral structures.
  • To explore the potential application of findings to miniaturized metamaterials.

Main Methods:

  • Fabrication of a large-scale spiral structure using laser processing.
  • Deformation modeling of the planar spiral structure.
  • GHz radio wave experiments to measure optical response, specifically the cross-polarization component.

Main Results:

  • A structural mechanics model for spiral structure deformation was successfully constructed and verified.
  • Experiments showed that more uniform deformation structures yielded higher cross-polarization components.
  • Uniform deformation was linked to improved circular dichroism in GHz band devices.

Conclusions:

  • The validated model accurately predicts the deformation of spiral structures.
  • Uniform deformation is a critical factor for enhancing circular dichroism in metamaterials.
  • Findings from large-scale prototypes are transferable to miniaturized devices like MEMS terahertz metamaterials.