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[Guilin Sun]

周期结构都可以看作是广义的光栅，光栅衍射级计算有多个函数，基本原理参见
Grating projections分解
相关的脚本Script函数参见
Grating projections脚本 ，下面是列表

FDTD, MODE

• grating : Returns the fraction of transmitted power to each physical grating orders for a given simulation.
• gratingn : Returns a vector of the grating order numbers.
• gratingm : Returns a vector of the grating order numbers.
• gratingpolar : Returns the relative strength of all physical grating orders in spherical coordinates.
• gratingvector : Returns the relative strength of all physical grating orders in cartesian coordinates.
• gratingperiod1 : Returns grating period a ₁ .
• gratingperiod2 : Returns grating period a ₂ .
• gratingbloch1 : Returns bloch vector (k _{in_1} ).
• gratingbloch2 : Returns bloch vector (k _{in_2} ).
• gratingu1 : Returns first component of the unit vector u ₁ .
• gratingu2 : Returns second component of the unit vector u ₂ .
• gratingangle : Returns the angle of each order.
• gratingordercount : Returns the total number of supported grating numbers.
• getperiodicity : Returns the periodicity vector(s) associated with the active periodic boundary conditions in the specified solver.
• getsourcedirection : Returns a unit vector in the direction of the specified source wave vector.
• gratingorders : Returns a matrix data set with the propagating grating orders and and their corresponding grating angles.
• gratingprojection : Returns a matrix data set with the propagating grating orders, grating angles and the relative power into each grating order.

See Also

Grating projection toolbox , Far field projection toolbox , List of commands

 

例子参见
Gratings
特别注意，光栅是超强的色散结构，不同波长的衍射特性可能不同。 斜入射可以使用最新的 BFAST 得到[宽光谱的结果]。

 

在一些分析时，例如超材料， 有时需要知道有没有高级次衍射，此时仅需要用GUI查看远场，方法是，点击监视器，选Visualizer，选far field，注意选取合适的周期个数。

有时仅需要衍射级信息，可以参考 这个例子
如果使用的色散材料，分析组可能出现问题，可以通过邮件联系我们。