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Related Concept Videos

Gap Junctions01:37

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Optical bistability in metal gap waveguide nanocavities.

Yun Shen1, Guo Ping Wang

  • 1Key Laboratory of Acoustic and Photonic Materials and Devices, Ministry of Education and Department of Physics, Wuhan University, Wuhan 430072, China.

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Researchers developed metal-dielectric nanocavities to achieve optical bistability using nonlinear optical materials. This breakthrough enables lower operating power for nanoscale optical devices like switches and transistors.

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Area of Science:

  • Nanophotonics
  • Nonlinear Optics
  • Plasmonics

Background:

  • Metal-dielectric nanocavities offer potential for optical signal processing.
  • Nonlinear optical materials are crucial for advanced photonic devices.
  • Optical bistability is a key phenomenon for all-optical switching.

Purpose of the Study:

  • To introduce metal-dielectric nanocavities for optical bistability.
  • To achieve optical bistability in the nanoscale domain.
  • To explore applications in nanoscale optical computing.

Main Methods:

  • Fabrication of metal-dielectric nanocavities with nonlinear optical materials.
  • Utilizing finite-difference time-domain (FDTD) simulations.
  • Analyzing the enhancement of local field intensity and surface plasmon confinement.

Main Results:

  • Demonstrated optical bistability in metal-dielectric nanocavities.
  • Achieved bistability with significantly reduced operating light power.
  • Observed enhanced local field intensity and nanoscale confinement of surface plasmon polaritons.

Conclusions:

  • Metal-dielectric nanocavities provide a viable platform for nanoscale optical bistability.
  • The enhanced local field and plasmon confinement are key to reduced power requirements.
  • This work paves the way for high-density integration of optical circuits, including logical gates, switches, and all-optical transistors.