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Computational Electromagnetics Modeling: Which Module to Use?
A question we get asked all of the time is: “Which of the COMSOL products should be used for modeling a particular electromagnetic device or application?” In addition to the capabilities of the core...
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Modeling a Scatterer Near an Optical Waveguide
The dielectric slab waveguide is one of the conceptual building blocks in photonic structure design. Although most real structures are more complex than just a two-dimensional dielectric slab, we can...
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Modeling Waveguides that Support Multiple Modes
Have you ever been in the situation where you are modeling a waveguide that supports multiple different modes at its highest operating frequency? As you might already know, such cases require a bit of...
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2 Video Discussions on Multiphysics Simulation of Optics and Photonics
Why use multiphysics software for optical simulations? This is one of the questions that Laser Focus World Senior Editor John Wallace asks in a 2-part video chat with Chris Boucher, technical product...
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Evanescent Component of the Nonparaxial Gaussian Beam
The Gaussian beam is the most popular light source in wave optics. This blog post discusses the evanescent component of the nonparaxial Gaussian beam background field, a feature available in the...
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Modeling the Scattering of Light Off of an Object on a Substrate
A frequent modeling situation encountered in wave electromagnetics modeling is to compute the scattering of light off of a structure patterned on top of a uniform dielectric substrate. In this blog...
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How to Perform Lens Simulations Using the Wave Optics Module
Performing lens simulations in wave optics is generally difficult, because it requires a lot of mesh elements. In this blog post, we demonstrate how the Wave Optics Module, an add-on to the COMSOL...
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What Is the Curl Element (and Why Is It Used)?
The curl element, sometimes called edge element or vector element, is widely used in the finite element method to solve electromagnetics problems. This blog post gives a comprehensive introduction to...
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Engineering the Flow of Light Using Photonic Crystals
In 1980, Eli Yablonovitch from Bell Communication Research pondered how to reduce losses in semiconductor lasers in a specific frequency range. He sliced periodic circular holes in a transparent medium...
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Keynote Video: Improving Synchrotron Light Sources with Applications
When it comes to synchrotron light sources, brighter is better. By using bright beams in their accelerator, researchers at the Advanced Proton Source (APS) synchrotron facility can efficiently gather...
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Calculating the Spectral Properties of an Optical Ring Resonator
If you ever visit the extravagant dome within St. Paul’s Cathedral in London, be careful what you say. As Lord Rayleigh discovered circa 1878, the vaulted structure exhibits an interesting acoustics...
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The Nonparaxial Gaussian Beam Formula for Simulating Wave Optics
In a previous blog post, we discussed the paraxial Gaussian beam formula. Today, we’ll talk about a more accurate formulation for Gaussian beams, available as of version 5.3a of the COMSOL® software....
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Chasing Waves: The Story of John Scott Russell and the KdV Equation
During his life, John Scott Russell chased his passion for science — literally. While watching horses pull a boat through a shallow canal, he noticed a wave behaving strangely and followed it for one...
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How to Model Linear and Nonlinear Optics in the COMSOL® Software
In 1875, John Kerr placed current-carrying coils in holes on either side of a glass slab, which created an electric field. After a polarized beam of light passed through the slab, he noticed that the...
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How to Use the Beam Envelopes Method for Wave Optics Simulations
In the wave optics field, it is difficult to simulate large optical systems in a way that rigorously solves Maxwell’s equation. This is because the waves that appear in the system need to be resolved...
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How to Model Optical Anisotropic Media with COMSOL Multiphysics®
On a bright evening in 1669, Professor Erasmus Bartholinus looked through a piece of an Icelandic calcite crystal he had placed onto a bench. He observed when he covered text on the bench with the...
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Silicon Photonics: Designing and Prototyping Silicon Waveguides
In 1870, an audience watched as a stage was set with two buckets, one on top of the other. Due to a small hole in the upper bucket, water poured into the lower bucket, bending as it did so. To the...
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How to Model the Optical Properties of Rough Surfaces
Whenever light is incident on a dielectric material, like glass, part of the light is transmitted while another part is reflected. Sometimes, we add a metal coating, such as gold, which alters the...
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Analyzing the Design of a New Generation of Midinfrared Fiber Optics
Optical fibers that deliver midinfrared wavelengths are in high demand for a range of relative applications. As infrared transparent materials, semiconductors are useful for this purpose when combined...
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How to Implement the Fourier Transformation from Computed Solutions
We previously learned how to calculate the Fourier transform of a rectangular aperture in a Fraunhofer diffraction model in the COMSOL Multiphysics® software. In that example, the aperture was given as...
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