Application Gallery

Optical microcavities based on optical waveguides typically have a high quality factor and can be applied in various fields such as optical filters, lasers, and modulators. This case aims to analyze the resonance spectrum of a 1D Bragg grating microcavity based on an optical waveguide. Using the FDTD method, the resonant frequencies and quality factor Q are calculated too. By increasing the dimensions of the central structure of the Bragg grating, a defect is introduced that enables the occurrence of transmission resonance within the stopband of the Bragg structure.

The chemical potential of graphene can be regulated by methods such as voltage or chemical doping. This property makes graphene highly versatile in the field of material-light interactions, particularly in relation to surface plasmon polaritons (SPPs). By exciting surface plasmons, graphene significantly enhances its ability to interact with light.

Single-mode fibers feature a smaller core diameter than multimode fibers, enabling the single-mode transmission within the operating wavelength range. This design improves the transmission performance and reliability of single-mode fibers. Single-mode fibers are widely used in communication fields, including long-distance fiber optic communication, data center interconnection, wireless base station backhaul, CATV, fiber optic sensing, etc. This case aims to demonstrate a simple mode calculation by taking SMF-28 single-mode fiber as an example.

The human eye perceives specific colors in response to specific light spectra. Reflective color filters are used to selectively modulate reflection spectra to provide different color perceptions to the human eye. This case demonstrates how to calculate the chromaticity coordinates related to the reflection spectrum, and further analyzes the color adjustment patterns of the color filter.

Negative index metamaterial (NIM) refers to an artificial optical structure whose refractive index is negative for electromagnetic waves within a certain frequency range. The purpose of this article is to simulate and explain the metamaterial structure described in the paper written by J. Zhou.

The interaction between incident light and surface electrons of a metallic nanostructure leads to surface plasmon resonance (SPR), which exhibits unique optical properties, including out-of-limit diffraction and local field enhancement. This case involves building a model of a metal film structure with air-hole array and calculating the transmission and reflection spectra of the film by the FDTD method to analyze the near-field distribution on the film surface and the local field enhancement caused by SPR.

Graphene is a single-layer carbon material that is only one atom thick. It can be used in nanoscale plasmon systems due to its unique physical properties. Light can be manipulated and controlled by adjusting the electrostatic doping or Fermi level to excite plasmon waves in single-layer graphene. According to the research by Chu et al., slight variations in the number of graphene layers and Fermi level can lead to significant changes in the resonant wavelength and modulation intensity. This case aims to simulate this tuning process in 3D FDTD.

The whispering gallery modes of a microdisk use the total internal reflection (TIR) of light to confine the light within the microdisk to achieve light enhancement. The whispering gallery mode of a microdisk has a high quality factor and a small mode volume, so it is a frontier and popular field of current optical research. In this case, we hope to find the first- and second-order whispering gallery modes of GaN cylinders.

Metamaterial is a man-made material with special properties that is not found in nature. This material can regulate basic physical characteristics such as frequency, amplitude, phase and polarization of electromagnetic waves. This case simulates the passive metamaterial described in the paper Chen et al.

How to improve Organic solar cells'(OSCs) photoelectric conversion efficiency (PCE) is an urgent problem to be solved. One of the more commonly used methods is to add micro-nano structures for light trapping into the photoactive layer of OSCs to increase light absorption, thereby improving PCE. The photonic crystal (PC) structure is used in the photoactive layer of OSCs, which can enhance the light absorption of solar cells in specific wavelength bands. This case uses FDTD simulation to analyze the light absorption of an OSC with a 2D hexagonal-lattice PC structure.