Description: We rigorously analyze the dispersion function and the curvature of the dispersion surface of a photonic
crystal to explore the fundamental limit of its angular sensitivities. With insight gained from group theory, we
fi nd that symmetry induced degeneracy gives rise to a singular dispersion surface curvature and a nonvanishing
group velocity simultaneously. Near such a singularity, high angular sensitivities can be achieved at low optical
loss. This phenomenon exists generally in most common two-dimensional and three-dimensional photonic
crystal lattices, although it occurs only for certain photonic bands as dictated by symmetry. Platform: |
Size: 282944 |
Author:Qtai |
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Description: The dispersion relation and the optical transmittance of a two-dimensional photonic crystal composed of the
hexagonal array of cylindrical air holes fabricated in a dielectric slab were analyzed by group theory and the
numerical calculation based on the fi nite-difference time-domain method. The decay rate of the leaky modes
that exist above the light line ~the dispersion relation in air! in the band diagram was also evaluated, from
which the absence of the coupling between certain internal eigenmodes and the external radiation fi eld was
shown. This phenomenon was related to symmetry mismatching by the group-theoretical argument. Platform: |
Size: 185066 |
Author:Qtai |
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Description: We rigorously analyze the dispersion function and the curvature of the dispersion surface of a photonic
crystal to explore the fundamental limit of its angular sensitivities. With insight gained from group theory, we
fi nd that symmetry induced degeneracy gives rise to a singular dispersion surface curvature and a nonvanishing
group velocity simultaneously. Near such a singularity, high angular sensitivities can be achieved at low optical
loss. This phenomenon exists generally in most common two-dimensional and three-dimensional photonic
crystal lattices, although it occurs only for certain photonic bands as dictated by symmetry. -We rigorously analyze the dispersion function and the curvature of the dispersion surface of a photoniccrystal to explore the fundamental limit of its angular sensitivities. With insight gained from group theory, we Platform: |
Size: 282624 |
Author:Qtai |
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Description: The dispersion relation and the optical transmittance of a two-dimensional photonic crystal composed of the
hexagonal array of cylindrical air holes fabricated in a dielectric slab were analyzed by group theory and the
numerical calculation based on the fi nite-difference time-domain method. The decay rate of the leaky modes
that exist above the light line ~the dispersion relation in air! in the band diagram was also evaluated, from
which the absence of the coupling between certain internal eigenmodes and the external radiation fi eld was
shown. This phenomenon was related to symmetry mismatching by the group-theoretical argument. -The dispersion relation and the optical transmittance of a two-dimensional photonic crystal composed of thehexagonal array of cylindrical air holes fabricated in a dielectric slab were analyzed by group theory and thenumerical calculation based on the Platform: |
Size: 184320 |
Author:Qtai |
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Description: We have used phase-sensitive ultrashort-pulse interferometry to study the modifi cation of optical
pulse propagation near the photonic band edges in colloidal crystals consisting of polystyrene spheres in
water. A strong suppression of the group velocity is found at frequencies near the L gap of the fcc lat-
tice. The group velocity dispersion diverges at the band edges and shows branches of both normal dis-
persion and anomalous dispersion, which can be interpreted as large changes in the effective mass, both
positive and negative. We obtain excellent agreement with the dynamical diffraction theory. Platform: |
Size: 53248 |
Author:Qtai |
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Description: 外国人开发的电磁时域有限差分方法工具包
Electromagnetic Finite-Difference Time-Domain (EmFDTD)
is a basic two-dimensional FDTD code developed at the
School of Electrical Engineering, Sharif University of
Technology.
This code has been written based on the standard
Yee s FDTD algorithm. Applications include propagation,
scattering, and diffraction of electromagnetic waves
in homogeneous and non-homogeneous isotropic media
for in-plane propagating waves. Negative permittivites
or permeabilities as well as dispersion is not included.
Zero, Periodic, and Perfectly Matched Layer boundary
conditions may be selectively applied to the solution
domain.
The program is best suited for study of propagation and
diffraction of electromagnetic waves in Photonic Crystal
structures.
EmFDTD is written in MATLAB language and has been
tested under MATLAB 5.0 and higher versions.-Foreigners developed electromagnetic FDTD method Toolkit Electromagnetic Finite-Difference Time-Domain (EmFDTD) is a basic two-dimensional FDTD code developed at the School of Electrical Engineering, Sharif University of Technology. This code has been written based on the standard Yee s FDTD algorithm. Applications include propagation, scattering, and diffraction of electromagnetic wavesin homogeneous and non-homogeneous isotropic mediafor in-plane propagating waves. Negative permittivites or permeabilities as well as dispersion is not included.Zero, Periodic, and Perfectly Matched Layer boundaryconditions may be selectively applied to the solution domain.The program is best suited for study of propagation anddiffraction of electromagnetic waves in Photonic Crystalstructures.EmFDTD is written in MATLAB language and has beentested under MATLAB 5.0 and higher versions. Platform: |
Size: 21504 |
Author: |
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Description: 模拟一维光子晶体中光波的传播，演示了色散曲线，对于了解光子晶体很有帮助。-Simulation of one-dimensional photonic crystal in the spread of light, demonstrated a dispersion curve, very helpful for the understanding of photonic crystals. Platform: |
Size: 1024 |
Author:wanghong |
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Description: This program calculates and plots the dispersion relations of elmag. waves
in a 1D photonic crystal (PhC) for both "s" (TE) and "p" (TM) polarization states
The 1D-PhC has a unit cell made of two different dielectric materials (known as Bragg mirror)
The propagation angle in one medium is taken as input-This program calculates and plots the dispersion relations of elmag. waves
in a 1D photonic crystal (PhC) for both "s" (TE) and "p" (TM) polarization states
The 1D-PhC has a unit cell made of two different dielectric materials (known as Bragg mirror)
The propagation angle in one medium is taken as input Platform: |
Size: 2048 |
Author:xi an |
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Description: 用FDFD模拟光子晶体光纤的色散的程序，主程序为FDFD.m，计算色散的为dispersion.m-FDFD simulation of photonic crystal fibers with a dispersion of the process, the main program for the FDFD.m, calculated dispersion for dispersion.m Platform: |
Size: 241664 |
Author:lyang |
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Description: 利用FDTD模拟光子晶体光纤中的色散的程序，是在wang.m程序基础上改进之后计算色散的。-FDTD simulation of photonic crystal fiber used in the dispersion of the procedure is based on the improvements in the program after wang.m calculated dispersion. Platform: |
Size: 7168 |
Author:lyang |
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Description: 能模拟一维光子晶体的传输参数和它的色散关系的模拟程序。-Can simulate one-dimensional photonic crystal and its transmission parameters of the dispersion relation of the simulation program. Platform: |
Size: 23552 |
Author:yueguang |
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Description: 计算有空气孔介质光子晶体的色散曲线，供大家交流，互相学习-Calculated free pore Photonic crystal dispersion curves for all to exchange, learn from each other Platform: |
Size: 1024 |
Author:gaoxi |
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Description: 本代码可不用借助其他工具直接对光子晶体光纤的色散等直接计算，对学习pcf的朋友很有帮助！-This code can be without the help of other tools directly on the photonic crystal fiber dispersion and other direct calculation, learning pcf helpful friends! Platform: |
Size: 1024 |
Author:xiao li |
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Description: 计算光子晶体光纤色散的程序，可以得到色散随波长变化图-Photonic crystal fiber dispersion calculation procedure can be a function of wavelength dispersion diagram Platform: |
Size: 2048 |
Author: |
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Description: this program calculates and plots the dispersion relations of EMwaves in a 1D photonic crystal (PhC) for both "s" (TE) and "p" (TM) polarization states Platform: |
Size: 1061 |
Author:ibror9 |
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Search - photonic crystal dispersion