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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Updated: Apr 23, 2026

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

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Published on: October 13, 2017

Continuous-wave biexciton lasing at room temperature using solution-processed quantum wells.

Joel Q Grim¹, Sotirios Christodoulou¹, Francesco Di Stasio¹

¹Istituto Italiano di Tecnologia, via Morego 30, IT-16163 Genova, Italy.

Nature Nanotechnology

|October 6, 2014

Summary

This summary is machine-generated.

Two-dimensional cadmium selenide (CdSe) colloidal nanosheets enable low-threshold stimulated emission at room temperature. This breakthrough paves the way for continuous-wave pumped lasers using solution-processed materials.

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Last Updated: Apr 23, 2026

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Area of Science:

Materials Science
Optoelectronics
Nanoscience

Background:

Solution-processed inorganic and organic materials are explored for low-threshold, high-gain lasing due to tunable optoelectronic properties and ease of processing.
While stimulated emission and lasing have been demonstrated, the continuous-wave (CW) pumping regime remains unachieved for these materials.

Purpose of the Study:

To investigate the potential of two-dimensional (2D) CdSe colloidal nanosheets as advanced lasing media.
To explore the exciton and biexciton properties of these colloidal quantum wells and their suitability for room-temperature stimulated emission.

Main Methods:

Synthesis of 2D CdSe colloidal nanosheets.
Characterization of exciton and biexciton binding energies.
Femtosecond pulsed excitation of close-packed thin films.
Embedding layers in surface-emitting microcavities.

Main Results:

2D CdSe colloidal nanosheets exhibit large exciton (132 meV) and biexciton (30 meV) binding energies.
Stimulated emission from biexcitons was observed at room temperature.
An ultralow stimulated emission threshold of 6 μJ cm⁻² was achieved under pulsed excitation.
Continuous-wave pumped stimulated emission and lasing were demonstrated in microcavity devices.

Conclusions:

2D CdSe colloidal nanosheets offer a promising platform for solution-processed, high-gain, low-threshold lasing media.
The large binding energies facilitate efficient biexciton dynamics for room-temperature operation.
This work advances the prospect of achieving CW-pumped lasers from colloidal nanomaterials.