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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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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Related Experiment Video

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

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Published on: November 30, 2012

Ridge waveguide without high refractive index layer: multilayer side cladded ridge waveguide.

H Mori

    Applied Optics
    |February 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates a novel waveguide design using a fused quartz substrate and gold cladding. The proposed structure effectively confines light without a high refractive index guiding layer, validated by experimental near-field patterns.

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    Last Updated: Jun 16, 2026

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Waveguide Technology

    Background:

    • Traditional waveguides often rely on high refractive index layers for light confinement.
    • Developing alternative waveguide structures is crucial for advanced photonic applications.

    Purpose of the Study:

    • To describe and validate a novel waveguide design that achieves light propagation without a high refractive index guiding layer.
    • To investigate the light confinement properties of a waveguide composed of fused quartz, gold cladding, and a glycerin/air cladding.

    Main Methods:

    • Fabrication of a waveguide ridge from a fused quartz substrate.
    • Application of a low refractive index cladding layer of gold (Au).
    • Use of a high refractive index cladding layer comprising a glycerin-water solution or air.
    • Analysis of near-field patterns to confirm light confinement.
    • Measurement of coupling angles and comparison with calculations using the equivalent refractive index method.

    Main Results:

    • Successful demonstration of light propagation in the designed waveguide structure.
    • Experimental confirmation of light confinement through near-field pattern analysis.
    • Observed coupling angles closely matched calculated values, validating the equivalent refractive index method.

    Conclusions:

    • The proposed waveguide design effectively confines light without requiring a high refractive index guiding region.
    • The equivalent refractive index method provides an accurate approach for calculating waveguide performance parameters.
    • This research offers a new pathway for designing optical waveguides with specific functionalities.