Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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...
Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Clinical outcomes after implementation of a lung nodule surveillance programme in Hong Kong.

Hong Kong medical journal = Xianggang yi xue za zhi·2025
Same author

[Associations between serum GDF15 and glycolipid metabolism disorder in metabolic associated fatty liver patients].

Zhonghua nei ke za zhi·2023
Same author

Improved method for determination of optical constants of organic thin films from reflection and transmission measurements.

Applied optics·2008
Same author

Modeling the Optical Constants of Diamonds from 0.06 to 30 eV.

Applied optics·2008
Same author

Modeling the index of refraction of insulating solids with a modified lorentz oscillator model.

Applied optics·2008
Same author

Interaction of heparin with thrombin and antithrombin III.

Federation proceedings·1977

Related Experiment Video

Updated: Jul 7, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Polarization-insensitive electroabsorption by use of quantum well interdiffusion.

W C Choy, E H Li

    Applied Optics
    |February 13, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed polarization-insensitive waveguide modulators using interdiffused AlGaAs/GaAs quantum wells. This method creates paraboliclike structures, enabling efficient electroabsorptive modulation for optical devices.

    More Related Videos

    Gradient Echo Quantum Memory in Warm Atomic Vapor
    10:00

    Gradient Echo Quantum Memory in Warm Atomic Vapor

    Published on: November 11, 2013

    Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
    05:39

    Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

    Published on: August 2, 2019

    Related Experiment Videos

    Last Updated: Jul 7, 2026

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

    Gradient Echo Quantum Memory in Warm Atomic Vapor
    10:00

    Gradient Echo Quantum Memory in Warm Atomic Vapor

    Published on: November 11, 2013

    Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
    05:39

    Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

    Published on: August 2, 2019

    Area of Science:

    • Optoelectronics
    • Semiconductor Physics
    • Materials Science

    Background:

    • Waveguide modulators are crucial for optical communication.
    • Polarization sensitivity limits modulator performance.
    • Achieving polarization-insensitive modulators is a key research goal.

    Purpose of the Study:

    • To propose and theoretically investigate the use of interdiffused AlGaAs/GaAs quantum wells for creating paraboliclike structures.
    • To demonstrate the potential for polarization-insensitive electroabsorptive modulators using this approach.

    Main Methods:

    • Theoretical modeling of interdiffusion in AlGaAs/GaAs quantum wells to achieve paraboliclike profiles.
    • Analysis of quantum well properties including eigenstate spacing and Stark shifts.
    • Simulation of electroabsorptive modulation characteristics.

    Main Results:

    • Interdiffused quantum wells exhibit equal eigenstate spacing and polarization-insensitive Stark shifts, mimicking ideal parabolic wells.
    • The proposed structures can achieve modulation depths comparable to existing parabolic quantum wells.
    • Three procedures were outlined for developing polarization-insensitive on/off states.

    Conclusions:

    • Interdiffused AlGaAs/GaAs quantum wells offer a viable route to polarization-insensitive electroabsorptive modulators.
    • This approach allows for the use of standard rectangular quantum wells with post-growth thermal processing.
    • The developed structures hold promise for advanced optical communication systems.