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Chirality02:25

Chirality

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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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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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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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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.
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Nonlinear Chiral Metasurfaces Based on Structured van der Waals Materials.

Pavel Tonkaev1, Ivan Toftul1, Zhuoyuan Lu2

  • 1Nonlinear Physics Center, Research School of Physics, Australian National University, Canberra, Australian Capital Territory 2601, Australia.

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Summary

Researchers harnessed nanostructured van der Waals materials for nonlinear chiral photonics, achieving a 3-order enhancement in third-harmonic generation. This breakthrough enables novel optical functionalities with strong circular dichroism and efficient harmonic output.

Keywords:
chiralityhexagonal boron nitridemetasurfacesthird-harmonic generation

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Nonlinear chiral photonics investigates the nonlinear optical properties of chiral materials.
  • Existing systems often lack the novel optical functionalities achievable through nonlinear and chiral approaches.
  • Van der Waals materials offer unique properties for advanced optical applications.

Purpose of the Study:

  • To explore the application of nanostructured van der Waals materials in nonlinear chiral photonics.
  • To demonstrate enhanced third-harmonic generation (THG) and nonlinear circular dichroism (NCD) in these materials.
  • To establish a new platform for chiral metaphotonics with combined high-efficiency harmonic generation and large circular dichroism.

Main Methods:

  • Fabrication of hexagonal boron nitride (hBN) metasurfaces.
  • Utilizing quasi-bound states in the continuum (q-BIC) to drive nonlinear optical effects.
  • Characterization of third-harmonic generation and nonlinear circular dichroism spectra at resonant frequencies.

Main Results:

  • Achieved a 3-order of magnitude enhancement in third-harmonic generation from hBN metasurfaces.
  • Observed strong nonlinear circular dichroism at the q-BIC resonances.
  • Demonstrated a novel platform for chiral metaphotonics with significant enhancement in optical functionalities.

Conclusions:

  • Nanostructured van der Waals materials are highly effective for nonlinear chiral photonics.
  • The demonstrated hBN metasurfaces provide a powerful platform for advanced optical devices.
  • This work opens avenues for creating devices with large circular dichroism and efficient harmonic generation across a wide frequency range.