COMSOL Multiphysics | easywaysimu Engineering

Optical Ring Resonator COMSOL Simulation

A COMSOL-based photonics study modelling single-mode optical waveguides and whispering-gallery-mode ring resonators. The workflow investigates geometry, material setup, electric-field confinement and wavelength response to improve resonance sharpness, reduce optical losses and support compact PIC applications.

COMSOL optical ring resonator electric field at 410 nm

Step 01

Single-Mode Waveguide Geometry

The project begins with a rectangular single-mode optical waveguide model. The core and cladding domains define the guided optical path and provide the baseline structure used before developing the ring-resonator configuration.

COMSOL mode-analysis settings for optical waveguide

Step 02

Mode Analysis Setup

A COMSOL Mode Analysis study was configured to evaluate the optical modes supported by the waveguide. This step identifies whether the geometry and material combination can maintain single-mode behaviour before resonance analysis.

Step 03

Optical Ring Geometry

The waveguide model was extended into a ring-resonator layout with an adjacent coupling waveguide. This geometry allows evanescent coupling into the ring and creates wavelength-selective resonance behaviour.

Electric field distribution in optical ring resonator at 410 nm

Step 04

Resonant Electric-Field Distribution

The COMSOL field result shows energy circulating around the resonator at the resonant wavelength. This visual confirms whispering-gallery-mode behaviour and highlights where the field is confined inside the ring path.

Step 05

Wavelength Response and Notch Behaviour

The final response plot compares transmittance and reflectance across a focused wavelength interval. Sharp dips in the response indicate resonant wavelengths and support the study objective of improving Q-factor and reducing optical loss.

Transmittance and reflectance wavelength response for optical ring resonator

COMSOL Wave Optics • VLC Receiver Design

Optical Antenna for Visible Light Communication

A COMSOL Multiphysics study of a nano-scale optical Yagi-Uda antenna for visible light communication. The model compares a baseline antenna, an aluminium geometry-optimised scenario and a silver material-substitution scenario to improve directionality, field enhancement and transient optical-energy response.

Optimised COMSOL Yagi-Uda optical antenna radiation pattern

Step 01

Research Methodology and Scenario Plan

The project follows a four-phase workflow: in-depth research, antenna-type selection, scenario-based tuning and final performance testing. The scenario plan provides a controlled way to compare geometry and material choices against the same VLC target wavelength.

COMSOL VLC optical antenna research methodology

Yagi-Uda optical antenna geometry in COMSOL

Step 02

Nanoantenna Geometry in COMSOL

The optical Yagi-Uda antenna is built from a feed element, reflector and multiple directors. The spacing, rod length and radius are tuned at nanometre scale so the geometry can concentrate optical fields and steer radiation toward the intended receiving direction.

Step 03

Gaussian Time-Domain Excitation

A Gaussian-modulated optical pulse was defined to excite the antenna in the visible spectrum. This transient input allows the design to be assessed not only by field intensity but also by rise time, stored energy and response stability.

Gaussian optical pulse used for COMSOL VLC antenna simulation

Scenario 2 tangential electric field distribution for optical Yagi-Uda antenna

Step 04

Surface Electric-Field Enhancement

The geometry-optimised aluminium scenario shows stronger field concentration around the feed and director elements. This result indicates better optical signal collection and forward energy guidance compared with the baseline and material-only alternatives.

Step 05

Sliced Field Propagation

Sliced electric-field plots compare how each scenario distributes optical energy in space. Scenario 2 demonstrates clearer forward propagation and a more directed field region around the antenna structure.

Sliced electric field result for optimized Yagi-Uda antenna scenario

2D far-field radiation pattern for optimized optical Yagi-Uda antenna

Step 06

2D Radiation Directionality

The 2D far-field radiation pattern is used to evaluate lobe orientation and directivity. The optimised antenna produces a more useful forward lobe, which is important for improving the VLC receiver field-of-view and signal collection efficiency.

Step 07

3D Radiation and Transient Energy Response

The 3D radiation view verifies directional optical energy flow, while the total-energy plot compares transient response over time. Scenario 2 provides the most desirable response by combining forward radiation with a faster, more stable energy build-up.

3D radiation pattern for optimized optical Yagi-Uda nanoantenna

Total electric energy response for optimized optical Yagi-Uda antenna

Result Gallery

Scenario Comparison Views

The gallery compares the baseline design, the geometry-optimised aluminium design and the silver material-substitution scenario across surface fields, sliced fields, 2D radiation, 3D radiation and transient energy behaviour.