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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

17.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
17.0K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
4.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.8K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures
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Advancing quantum imaging: Electrical tunability enabled by versatile liquid crystals.

Dong Zhu1, Shi-Hui Ding1, Rui Sun1

  • 1National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Science Advances
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Summary
This summary is machine-generated.

Researchers developed a novel liquid crystal platform for dynamic heralded single-photon imaging. This technology enhances signal-to-noise ratios and enables ultrafast, remote switching for photon-limited imaging applications.

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Area of Science:

  • Quantum Imaging
  • Soft Matter Physics
  • Optical Image Processing

Background:

  • Heralded quantum imaging offers potential for identifying light-sensitive samples under low illumination.
  • Current quantum imaging techniques often lack dynamic control over imaging functions.
  • Liquid crystals are versatile materials with tunable optical properties.

Purpose of the Study:

  • To introduce a liquid crystal-based platform for dynamic heralded single-photon imaging.
  • To achieve electrically tunable multimode switching for quantum imaging.
  • To enhance signal-to-noise ratio and time efficiency in photon-limited imaging.

Main Methods:

  • Utilized bichiral cholesteric liquid crystals for morphology information extraction.
  • Employed nematic liquid crystals for electrically tunable polarization selection of heralded single photons.
  • Integrated ferroelectric liquid crystals for ultrafast remote switching.

Main Results:

  • Demonstrated high signal-to-noise ratio extraction of target morphology, including shape and outline.
  • Enabled dynamic remote switching in trimode quantum imaging via polarization selection.
  • Achieved ultrafast remote switching for improved time efficiency.

Conclusions:

  • Presented a versatile imaging platform for photon-limited scenarios using liquid crystals.
  • Highlighted the potential of soft matter in quantum information processing.
  • Established a novel approach for dynamic control in heralded quantum imaging.