Analysis of Radiation Characteristics of Photonic Crystal Slab Microcavities
Date Issued
2005
Date
2005
Author(s)
Wei, Shih-Chieh
DOI
en-US
Abstract
In this thesis, the radiation characteristics of photonic crystal slab microcavitiyes are numerically investigated. We use the finite-difference time-domain method as a simulation tool. Two structures are analyzed. One is an “air- photonic crystal- air” free-standing photonic crystal slab microcavity, and the other is an “air- photonic crystal- substrate” photonic crystal slab microcavity with substrate, which is similar to a real device. First, we investigate the relation between the radiation rate and the dipole source. We compare the radiation rate calculated by finite-difference time-domain method and that calculated by an analytic formula involving an inner product between the dipole moment and the electric field intensity. Then, we investigate the relation between the extraction efficiency and the dipole source. By multiplying the radiation rate and the extraction efficiency, we can obtain the effective extraction rate. Therefore, as we know the relation between the radiation rate and the dipole source, we can set multiple dipole sources in a microcavity. To simulate the spontaneous emission of a light-emitting diode, a randomly oriented dipole source is launched at each Yee cell of a microcavity. This study is helpful for increasing the radiation efficiency of light-emitting diodes and may be useful to the applications of display and lighting.
Subjects
光子晶體
微共振腔
photonic crystal
microcavity
Type
thesis
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