Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Exceptions to the Octet Rule

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Quantum Numbers

Quantum Numbers

It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.

The Quantum-Mechanical Model of an Atom

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.

Colloids and Suspensions

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

What is a Mode?

What is a Mode?

The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...

You might also read

Related Articles

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

Sort by

Same author

Bridging solar harvesting technologies using hydrogels towards sustainability.

Chemical Society reviews·2026

Same author

Stability and Compressibility of Tear Film Lipid Layer: Impact of Benzalkonium Chloride Presence.

bioRxiv : the preprint server for biology·2026

Same author

Toward a Unified Mechanistic Understanding of Polymer Electrolytes for Advanced Solid-State Batteries.

Advanced materials (Deerfield Beach, Fla.)·2026

Same author

Strain-Mediated Anisotropic Growth of Metal-Organic Framework Belts.

Small methods·2026

Same author

Hypervalent Iodine-Mediated Stereotactic Amidation Enables COF-to-COF Transformation for Supercapacitors.

Journal of the American Chemical Society·2026

Same author

Decrease in Nucleated Particles and Cloud Condensation Nuclei Observed across a Range of Environments.

Environmental science & technology·2026

Search research articles

Related Experiment Video

Updated: Jan 29, 2026

Production and Targeting of Monovalent Quantum Dots

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

Robust lasing modes in coupled colloidal quantum dot microdisk pairs using a non-Hermitian exceptional point.

Evan Lafalce¹, Qingji Zeng¹, Chun Hao Lin²

¹Department of Physics & Astronomy, University of Utah, Salt Lake City, UT, 84112, USA.

Nature Communications

|February 6, 2019

Summary

Researchers explored gain modulation in coupled microdisk lasers. They observed split modes coalescing at an exceptional point, demonstrating a new pathway for non-Hermitian physics in quantum dot devices.

More Related Videos

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Related Experiment Videos

Last Updated: Jan 29, 2026

Production and Targeting of Monovalent Quantum Dots

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Area of Science:

Non-Hermitian physics
Quantum optics
Materials science

Background:

Evanescently coupled microdisk lasers are key for studying exceptional points in non-Hermitian physics.
Scalability and versatility of these phenomena in different designs require further investigation.

Purpose of the Study:

To investigate the effect of gain/loss modulation in evanescently coupled microdisk optical resonators.
To explore the behavior of whispering gallery modes under spatially modulated optical pumping.

Main Methods:

Fabrication of microdisk optical resonators using solution-processed colloidal quantum dots.
Spatially modulating the optical pump to create a gain differential between coupled microdisks.
Analyzing emission spectra to observe mode splitting and coalescence.

Main Results:

Observed frequency-splitting of whispering gallery modes due to inherent structural imperfections.
Demonstrated that gain modulation can drive split intra-cavity modes into coalescence at an exceptional point.
Identified a three-mode system resulting from the coupled microdisks.

Conclusions:

Gain modulation provides a viable method to control and engineer exceptional points in coupled microdisk systems.
The study rationalizes the observed behavior using a Hamiltonian incorporating intra-cavity and anisotropic inter-cavity coupling.
This work highlights the potential of colloidal quantum dot microdisks for exploring complex non-Hermitian phenomena.