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Related Concept Videos

Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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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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Stereoisomers

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On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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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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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Updated: Oct 22, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Vectorial Compound Metapixels for Arbitrary Nonorthogonal Polarization Steganography.

Zi-Lan Deng1, Qing-An Tu1, Yujie Wang2

  • 1Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 31, 2021
PubMed
Summary

Researchers developed a new method for secure image steganography using nonorthogonal light polarizations. This technique enhances information security beyond traditional orthogonal methods, enabling advanced encryption and anti-counterfeiting applications.

Keywords:
metagratingsmetasurfacesmultidimensional manipulationsteganographyvectorial compound metapixelsvectorial holograms

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Area of Science:

  • Optics and Photonics
  • Metasurface Technology
  • Information Security

Background:

  • Malus' law governs light polarization through polarizers, forming the basis for current image steganography.
  • Existing methods relying on orthogonal polarizations limit security advancements.
  • Need for enhanced security in information encryption, anti-counterfeiting, and security labels.

Purpose of the Study:

  • To demonstrate arbitrary nonorthogonal polarization multiplexing of independent grayscale images with high fidelity and concealment.
  • To overcome the limitations of orthogonal polarization in image steganography.
  • To introduce a novel vectorial compound metapixel design for advanced optical encryption.

Main Methods:

  • Utilizing a vectorial compound metapixel design with tailored in-plane orientation.
  • Applying Jones matrix treatment for precise control of amplitude and polarization rotation.
  • Experimental demonstration on a visible TiO2 metasurface platform.

Main Results:

  • Achieved high-fidelity multiplexing of two grayscale images using arbitrary nonorthogonal polarization angles.
  • Successfully concealed a grayscale image within another, with arbitrary disclosure angles.
  • Demonstrated point-by-point configuration of output beam properties.

Conclusions:

  • The novel metapixel design enables advanced image steganography beyond orthogonal polarization limits.
  • This approach offers a new degree of freedom in metaoptics, enhancing polarization optics.
  • Opens new avenues for secure information encryption and anti-counterfeiting applications.