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Related Concept Videos

Phase Transitions02:31

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Reconfigurable Multistate Optical Systems Enabled by VO2 Phase Transitions.

Xiaoyang Duan1, Samuel T White2, Yuanyuan Cui3

  • 1Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany.

ACS Photonics
|November 26, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel multistate optical system using vanadium dioxide (VO2) phase transitions. This breakthrough enables dynamic reconfiguration with multiple stimuli, paving the way for advanced optical devices.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Reconfigurable optical systems are crucial for developing compact and flexible optical devices.
  • Current systems often lack the ability to tune multiple state variables simultaneously.
  • This limits their application scope and functionality.

Purpose of the Study:

  • To demonstrate a novel reconfigurable multistate optical system.
  • To utilize the phase-transition properties of vanadium dioxide (VO2) for optical reconfiguration.
  • To overcome the limitations of single-state tuning in existing optical systems.

Main Methods:

  • Exploiting the phase transitions of vanadium dioxide (VO2) triggered by simultaneous stimuli.
  • Implementing temperature tuning and hydrogen-doping to control VO2 phase characteristics.
  • Developing an electron-doping scheme for localized control of VO2 phase transitions.

Main Results:

  • Demonstration of a quadruple-state dynamic plasmonic display.
  • Successful reconfiguration of optical system responses among multiple states.
  • Creation of an optical encryption device with multiple keys using localized VO2 control.

Conclusions:

  • The developed multistate optical system offers superior capabilities and functionalities compared to current devices.
  • The use of VO2 phase transitions opens new avenues for advanced reconfigurable optical systems.
  • This research paves the way for next-generation optical devices with enhanced flexibility and performance.