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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Related Experiment Video

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Coupling of concentric semiconductor microring lasers.

L Djaloshinski, M Orenstein

    Optics Letters
    |December 18, 2007
    PubMed
    Summary
    This summary is machine-generated.

    This study analyzes coupling in concentric microcavity lasers, obtaining a 3D vectorial solution. Experiments confirm resonant coupling regimes, aligning with theoretical predictions for microcavity laser performance.

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    Last Updated: Jul 9, 2026

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Microcavity Devices

    Background:

    • Whispering-gallery modes (WGMs) are crucial for microcavity laser operation.
    • Understanding mode coupling in concentric microcavities is essential for laser design and performance optimization.
    • Previous models often lacked a comprehensive vectorial treatment for complex geometries.

    Purpose of the Study:

    • To theoretically analyze the coupling between whispering-gallery modes in concentric microcavity lasers.
    • To derive a closed-form, three-dimensional (3D) vectorial solution for the coupled optical fields.
    • To experimentally validate the theoretical model using specific laser configurations.

    Main Methods:

    • Development of a 3D vectorial electromagnetic theory to describe coupled WGMs.
    • Analytical derivation of closed-form solutions for the electromagnetic fields.
    • Experimental implementation using concentric gain-guided vertical cavity ring lasers.
    • Comparison of experimental results with theoretical predictions.

    Main Results:

    • A closed-form 3D vectorial solution for coupled whispering-gallery modes was successfully obtained.
    • Experimental regimes of resonant coupling were observed in concentric gain-guided vertical cavity ring lasers.
    • The experimental findings showed good agreement with the derived theoretical solution.

    Conclusions:

    • The theoretical framework provides an accurate description of mode coupling in concentric microcavity lasers.
    • The validated model can guide the design of advanced microcavity laser systems.
    • Resonant coupling phenomena are experimentally confirmed and well-predicted by the 3D vectorial theory.