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Related Concept Videos

Standing Waves in a Cavity01:28

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: May 19, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Deep-subwavelength waveguiding via inhomogeneous second-harmonic generation.

Vito Roppo1, Maria Antonietta Vincenti, Domenico de Ceglia

  • 1C M Bowden Research Center, AMSRD-AMR-WS-ST, RDECOM, Redstone Arsenal, Alabama 35898-5000, USA. vito.roppo@gmail.com

Optics Letters
|August 4, 2012
PubMed
Summary

We explore light trapping in narrow waveguides for efficient second-harmonic generation. This method overcomes limitations like diffraction and cutoff, enabling enhanced nonlinear optical processes.

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Last Updated: May 19, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Area of Science:

  • Nonlinear Optics
  • Waveguide Physics
  • Materials Science

Background:

  • Second-harmonic generation (SHG) is crucial for frequency conversion.
  • Subwavelength waveguides offer unique light confinement properties.
  • Controlling light propagation in nanoscale structures is challenging.

Purpose of the Study:

  • To theoretically investigate SHG in extremely narrow, subwavelength waveguides.
  • To explore a novel guiding mechanism for enhanced nonlinear light-matter interactions.
  • To understand light trapping phenomena in such structures.

Main Methods:

  • Theoretical modeling of light propagation in subwavelength waveguides.
  • Analysis of nonlinear optical processes, specifically SHG.
  • Investigation of diffraction inhibition and cutoff suppression mechanisms.

Main Results:

  • Identified a guiding mechanism that inhibits diffraction.
  • Demonstrated suppression of cutoff limits in subwavelength waveguides.
  • Observed light trapping under phase and group velocity mismatch conditions.

Conclusions:

  • The proposed guiding mechanism enables efficient SHG in narrow waveguides.
  • Light trapping is a key phenomenon for overcoming propagation limits.
  • This work provides a theoretical foundation for nanoscale nonlinear optics.