Simulation on Radiation Characteristics of a Photonic Crystal Microcavity
Date Issued
2004
Date
2004
Author(s)
Chen, Tyng-Yang
DOI
en-US
Abstract
Abstract
In this thesis, the radiation characteristics of various kinds of photonic crystal slab microcavites are numerically investigated. Light is confined within the defect region by the combined action of distributed Bragg reflection and total internal reflection. This kind of photonic crystal has been employed in making a semiconductor light-emitting diode (LED). By using the three-dimensional finite-difference time-domain (FDTD) method, we calculate the radiation characteristics for the square-lattice or triangular-lattice microcavity consisting of a single defect. The relation between the radiation characteristics and the radii of air holes around the defect is discussed. Then, the positions and shapes of nearest holes are adjusted. In some structures, we only need to perform small adjustment of the defect geometry to get better radiation characteristics, without significantly changing the photonic crystal structure and refractive index of dielectric material. Some conclusions are drawn, which may be helpful for designing efficient LEDs.
Subjects
光子晶體
photonic crystal
Type
thesis
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