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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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Related Experiment Video

Updated: Sep 25, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Published on: February 25, 2017

Self-frequency-conversion nanowire lasers.

Ruixuan Yi¹, Xutao Zhang^2,3, Chen Li¹

¹Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xi'an, China.

Light, Science & Applications

|April 29, 2022

Summary

This summary is machine-generated.

III-V semiconductor nanowire (NW) lasers can achieve self-frequency conversion, enabling wavelength extension for nanoscale lasers. This process utilizes the NWs

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Last Updated: Sep 25, 2025

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Published on: April 26, 2014

Area of Science:

Nanoscale Photonics
Semiconductor Physics
Nonlinear Optics

Background:

Semiconductor nanowires (NWs) offer integrated gain medium and optical cavity for nanoscale lasers.
These NW lasers are compact, energy-efficient, and easily integrated.
Non-centrosymmetric crystal structures and localized optical fields are key properties of NWs.

Purpose of the Study:

To investigate the self-frequency conversion capabilities of III-V semiconductor NW lasers.
To extend the output wavelengths of nanoscale lasers using nonlinear optical processes.
To explore the potential for generating visible and other wavelengths from NW lasers.

Main Methods:

Fabrication and characterization of GaAs/In_0.16Ga_0.84As core/shell NW lasers.
Utilizing second-harmonic generation (SHG) and sum-frequency generation (SFG) for frequency conversion.
Employing far-field polarization dependence measurements and numerical modeling for confirmation.

Main Results:

A GaAs/In_0.16Ga_0.84As NW laser lasing at 1016 nm produced visible output at 508 nm via SHG.
Multiple self-frequency-conversion lasing modes were observed in a larger diameter NW laser.
Demonstrated SHG and SFG processes in NWs with different diameters and lasing modes.

Conclusions:

III-V semiconductor NW lasers exhibit self-frequency conversion capabilities.
This phenomenon allows for extending the output wavelengths of nanoscale lasers.
Potential applications include generating deep ultraviolet and THz range light from NW lasers.