# 模拟电磁波和周期性结构

2014年 1月 17日

### 定义衍射级

m\lambda_0 = d(n_B \sin \beta_m - n_A \sin \alpha_1)

for: m=0,\pm 1, \pm 2,

#### 评论 (6)

##### wajid ali
2017-04-16

how to simulate chiral medium

##### 宇航 秦
2017-04-21

Hello wajid ali ,

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Email: support@comsol.com

##### Zhimin Jing
2018-07-15

Dear Walter Frei,
I am writing to you for your help. These days i have been simulating a 3-D model of a periodic structure with oblique incidenting circular polarized light. But I have encountered some problems that have been solved for a long time.
I want to define a circular polarized light with an Angle of theta between the k and z axes, and k is on the z-x plane. My settings are as follows：I choosed “periodic” in type of port and
I defined the polarization of circular polarized light at both input and output port : cos (theta) in x direction, a* i in y direction, and -sin(theta) in z direction. Then, i choosed “floquent periodicity” in x and y direction in periodic condition. And i choosed “from periodic port” in k-vector for floquent periodicity. However, the charge map derived from the calculation results is not continuous on the right and left side of the structure in x direction.
I don’t know if my periodic conditions are wrong. Any reply from you will be greatly appreciated

##### Zhimin Jing
2018-07-15

Dear Walter Frei,
I am writing to you for your help. These days i have been simulating a 3-D model of a periodic structure with oblique incidenting circular polarized light. But I have encountered some problems that have been solved for a long time.
I want to define a circular polarized light with an Angle of theta between the k and z axes, and k is on the z-x plane. My settings are as follows：I choosed “periodic” in type of port and
I defined the polarization of circular polarized light at both input and output port : cos (theta) in x direction, a* i in y direction, and -sin(theta) in z direction. Then, i choosed “floquent periodicity” in x and y direction in periodic condition. And I choosed “from periodic port” in k-vector for floquent periodicity. However, the charge map derived from the calculation results is not continuous on the right and left side of the structure in x direction.
I don’t know if my periodic conditions are wrong. If wrong, how should I revise. Any reply from you will be greatly appreciated.
Sincerely yours,
Zhimin Jing

2018-10-19

Hi Zhimin ,