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May 15, 2022 at 7:17 am
r09941129
Subscriber請問在lumerical中如何定義我的source power 以及 power intensity
目前已經參考方法
FDTD 通過script
sp=sourcepower(f); # get power injected by source (Watts)
I=sourceintensity(f); # get source intensity (Watts/m^2)
此時的值我設置光源為600nm 得到的 intensity 和 sourcepower 可以看到值非常小
May 16, 2022 at 9:20 pmGuilin Sun
Ansys Employee这些主要是理解方面的困惑。
1: FDTD仿真中的光学功率
sp=sourcepower(f); # get power injected by source (Watts)
I=sourceintensity(f); # get source intensity (Watts/m^2)
根据是根据场和颇印廷矢量直接计算的,https://support.lumerical.com/hc/en-us/articles/360034925313-sourcepower-Script-command
为了简单起见,我们不讨论non-norm的情况,假设场都是对时间信号频谱归化过的,也就是场不随时间频谱而变化 Ansys Insight: 关于光源的归化问题:频谱和功率
这个时候,计算的功率就是强度乘面积 (光学强度参见 Ansys Insight: 光学强度、功率、电场强度平方的关系以及电磁能量).
以平面波为例,E=1 v/m, H是其120pi分之一。因为现在仿真区在微米量级,面积就是10^(-12) 量级,所以结果在-15量级。这个已经不小了。
2:Avalanche photodetector 我們在這邊可以看到input power 此時他直接定義為 scale factor,如果scale factor為1 時 是不是以為power就為1WATT 那是不是意味著和fdtd相差非常大
你要看原始输入的数据是否已经归化了。
因为已经与1瓦功率的入射功率归化了,所以如果scale factor為1 時 ,就认为power就為1WATT的了。实际的器件不可能承受1瓦的功率所以要给修改。这种修改主要是根据原数据已经归化为1瓦的情况下方便实际使用,否则你还要修改光学仿真结果。
3:charge example CMOS - Transient electrical response
这里用的是Intensity,不是功率,尽管用pwr,网站上说
不同例子研究的方法可能不同。建议就你仿真的器件参考现有例子,或者自己开发仿真方法。
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