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Properties of Enantiomers and Optical Activity02:24

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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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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Stereoisomerism

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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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Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Related Experiment Video

Updated: May 16, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Anisotropic Light-Matter Interaction in α-In2Se3: Wavelength-Dependent Study.

Divya Jangra1, Binoy Krishna De1,2, Pragati Sharma1

  • 1UGC-DAE Consortium for Scientific Research, D.A. University Campus, Khandwa Road, Indore 452001, India.

ACS Applied Materials & Interfaces
|April 3, 2025
PubMed
Summary

Researchers explored light interactions in 2D indium selenide (In2Se3) materials. They found that light-matter interactions and photoresponse are tunable by polarization and wavelength, paving the way for advanced polarization-sensitive photodetectors.

Keywords:
Electron−photon−phonon interactionLight−matter interactionOptical anisotropyPhotoresponsePolarized Raman spectroscopylight polarization-based optoelectronics

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Anisotropic light-matter interactions in 2D materials are crucial for polarization-based optoelectronic devices.
  • Ferroelectric materials offer unique properties for advanced electronic applications.

Purpose of the Study:

  • To investigate polarization-dependent light-matter interactions in ferroelectric 3R α-In2Se3.
  • To explore the tunability of photoresponse in In2Se3 for optoelectronic applications.

Main Methods:

  • Angle-Resolved Polarized Raman Spectroscopy with varied excitation lasers.
  • Density Functional Theory (DFT) calculations.
  • Scanning Transmission Electron Microscopy (STEM).

Main Results:

  • Light-matter interactions in 3R α-In2Se3 are dependent on crystallographic orientation and excitation energy.
  • The anisotropic crystal structure leads to significant optical anisotropy.
  • The anisotropic photoresponse is tunable by light polarization and wavelength.

Conclusions:

  • 3R α-In2Se3 exhibits significant optical and electrical anisotropy due to its crystal structure and light interactions.
  • The tunable anisotropic photoresponse makes In2Se3 a promising candidate for polarization-sensitive photodetection.