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Related Concept Videos

Hybrid Zones02:29

Hybrid Zones

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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
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Determining Membrane Protein Topology Using Fluorescence Protease Protection FPP
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Topological hybrid silicon microlasers.

Han Zhao1, Pei Miao2,3, Mohammad H Teimourpour4

  • 1Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.

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|March 9, 2018
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Summary
This summary is machine-generated.

Active topological photonics enables robust control over light. This study demonstrates a hybrid silicon microlaser array with unique symmetries, achieving protected single-mode lasing even with perturbations, paving the way for integrated photonic devices.

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Area of Science:

  • Topological physics
  • Active photonic systems
  • Integrated photonics

Background:

  • Topological physics offers robust control of wave confinement and propagation.
  • Current topological systems are limited by passive structures and restricted design parameters.
  • Active systems, incorporating non-Hermiticity and nonlinearity, expand the possibilities for topological physics.

Purpose of the Study:

  • To experimentally investigate an active topological photonic system.
  • To demonstrate a topological hybrid silicon microlaser array.
  • To explore new symmetry paradigms in topological physics.

Main Methods:

  • Implementation of an active topological photonic system.
  • Design and fabrication of a hybrid silicon microlaser array.
  • Exploitation of charge-conjugation symmetry in the system.
  • Introduction of perturbations to test robustness.

Main Results:

  • Demonstration of a topological hybrid silicon microlaser array.
  • Observation of lasing from a protected topological zero mode.
  • Robust single-mode laser action maintained despite introduced perturbations.
  • Successful integration on a silicon-on-insulator substrate.

Conclusions:

  • Active topological systems offer a broader design space for topological physics.
  • The demonstrated microlaser exhibits robust topological properties.
  • The hybrid silicon microlaser is suitable for integrated silicon photonics.
  • Potential applications in optical communication and computing.