Finite-Difference Time-Domain Modeling of Nonlinear Photonic Crystals
Date Issued
2006
Date
2006
Author(s)
Lin, Sheng-Jie
DOI
zh-TW
Abstract
In the thesis, we study the power transmission in the nonlinear photonic crystal cavities with the finite-difference time-domain method.The refractive index of photonic crystal cavities changes with the field intensity, which results in the change of resonant frequency.Therefore, we can launch different input power to control the resonant frequency.Because the field intensity can be very high in the photonic crystal cavities, the incident power level can be lowered dramatically. In the direct-coupled resonator geometry, the transmission increases as the frequency gets closer to the resonant frequency.With the input frequency lower than the resonant one in a linear limit and the input power varied, the result exhibits optical bistability of the transmission in two-dimensional structures and three-dimensional slab structures.In the side-coupled resonator geometry, the input wave is completely reflected at the resonant frequency.Using the similar procedure, the result exhibits optical bistability and high contrast in the power transmission in two-dimensional structures.Furthermore, using a control input changes the resonant frequency of the signal input,then the transmission of the signal input can be controlled by the control input.This provides an all-optical switch.
Subjects
光子晶體
共振腔
非線性效應
雙穩態
光開關
photonic crystals
cavity
nonlinear effect
bistability
optical switch
Type
thesis
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