The ability to modify an object's thermal radiation profile is important in many areas of applied physics and engineering. It has been noted that periodic engineering of devices made of metallic and dielectric materials at the subwavelength scale can change the thermal radiation properties of the device. This case studies the thermal radiation of a photonic crystal obtained by periodically arranging a device made of metallic tungsten and a dielectric material.
Photonic crystals, as a dielectric structure with periodic changes in dielectric constant, can prevent light of a specific frequency from propagating internally, forming a photonic band gap.
In this case, a 2D triangular-lattice PC formed by air cylinders arranged in parallel in the medium is constructed, and its bandstructure is calculated.
3D Cubic Lattice is a special case of 3D Rectangular Lattice. The lattice spacing of this type of photonic crystal is equal in three axes in space.
In this case, the optical waveguide model with periodic structure in the propagation axis is constructed, and the bandstructure of the waveguide is analyzed.
In this case, BCC and FCC photonic crystals are constructed and their bandstructures are analyzed using FDTD solvers.
In this case, the Woodpile-Lattice photonic crystal is constructed, and the FDTD solver is used to explore the energy bandstructure of the photonic crystal.
A Bragg grating is an optical device in which there is a periodic variation in the effective refractive index of the structure. The waveguide Bragg grating is a type of one-dimensional photonic crystal structure that enables wavelength selection through periodic modulation of the refractive index. The impact of the geometrical parameters of the sidewall corrugation, such as depth or misalignment, on the performance of Bragg gratings can be analyzed in silicon waveguide Bragg gratings, as demonstrated by Wang et al.
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.
Coaxial-fed rectangular patch antenna is a fundamental type of microstrip antenna composed of a dielectric substrate, a ground plane, and a conductive patch. Compared to traditional antennas, Coaxial-fed rectangular patch antennas are compact, lightweight, easy to integrate, cost-effective, and suitable for mass production. In this case, a rectangular patch antenna mounted on an infinite metal ground plane is simulated using FDTD, and its return loss and far-field directivity are calculated.
