COMSOL Forums: Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/
Most recent forum messagesTue, 18 Jun 2013 04:50:35 +0000COMSOL Forums: Reflectance / Transmittance calculation using PORThttp://www.comsol.com/shared/images/logos/comsol_logo.gif
http://www.comsol.com/community/forums/general/thread/34014/
Re: Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/#p104454
<div class="quote"><br />
Hello all<br />
<br />
I want to calculate effect of nanostructure on reflectance and transmittance.<br />
<br />
As a starting point, I have refered "Fresnel equation" library.<br />
Without any nanostructure, the calculated reflectance is well matched with theorectical value!<br />
So.. one thing I want to know is that the same port boundary condition can be applied to a model system with 3D nano structure? (Simply, air/Nanostructures on substrate/substrate)<br />
<br />
Also, I want to calculate the reflectance using input and output power.<br />
Output power can be calculated using integration of time-averaged power outflow (nPoav).<br />
However, I don't know how to know incident power when I use scattering boundary condition, or electric field condition.<br />
Would you comment on this?<br />
<br />
<Summary><br />
1. Using same model of "Fresnel equation" library, can reflectance of a system with 3D nano structure be calculate?<br />
2. How can I calculate incident power of light, when I use electric field boudnary condition?<br />
<br />
Thanks!<br />
<br />
Dong-yeong Kim<br />
</div><br />
<br />
<br />
<br />
I am a newbie in this field. I want to obtain reflectance and absorption spectra for a substarte. Can you tell me which module to use..?? Probably some link which gives step by step guidance.. ? <br />
<br />
Thanks<br />
<br />
Tue, 18 Jun 2013 04:50:35 +000034014.1371531035.104454Re: Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/#p93509
Thanks a lot!<br />
<br />
This is a big helpful to me.Thu, 10 Jan 2013 22:45:54 +000034014.1357857954.93509Re: Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/#p93497
1. Electric field BC - you simply specify total electric field at the boundary. Since you generally don't know the reflected field, you can't use it<br />
Scattering BC - to launch plane waves<br />
Port BC - to launch plane waves as well as any other. As a benefit, reflection coefficients are calculated for you.<br />
<br />
2. Floquet BC is more general since it takes care of phase shift at the boundary. Continuity BC doesn't.<br />
<br />
3. No. You should use Floquet. I'd suggest using it always, even when PEC/PMC would work.Thu, 10 Jan 2013 16:51:10 +000034014.1357836670.93497Re: Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/#p93428
Thanks sir.<br />
<br />
I wanna ask you 3 more things.<br />
<br />
1. As far as I know, there are 3 ways to generate electric field.<br />
- Scattering boundary condition<br />
- Electric field<br />
- Port<br />
Could you explain the differences between them?<br />
<br />
2. Many libraries are using Floquet periodicity for imposing periodic boundary condition.<br />
In my humble opinion, effect of "Floquet periodicity option" and "Continuity option" might be same.<br />
Is it right?<br />
<br />
3. For periodicity, PEC(PMC) condition can be used when electric(magnetic) field is normal to surface.<br />
So.. if field is not perpendicular to a certain surface, I should use a periodic condition instead of PEC/PMC.<br />
Is it also right?<br />
<br />
<br />
I have had difficulty choosinig boundary conditions. :(<br />
<br />
Wed, 09 Jan 2013 23:00:05 +000034014.1357772405.93428Re: Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/#p93400
1. Yes, generally<br />
2. Electric field BC won't give you the correct solution. Only scattering BC will work.Wed, 09 Jan 2013 15:37:34 +000034014.1357745854.93400Reflectance / Transmittance calculation using PORT
http://www.comsol.com/community/forums/general/thread/34014/#p93368
Hello all<br />
<br />
I want to calculate effect of nanostructure on reflectance and transmittance.<br />
<br />
As a starting point, I have refered "Fresnel equation" library.<br />
Without any nanostructure, the calculated reflectance is well matched with theorectical value!<br />
So.. one thing I want to know is that the same port boundary condition can be applied to a model system with 3D nano structure? (Simply, air/Nanostructures on substrate/substrate)<br />
<br />
Also, I want to calculate the reflectance using input and output power.<br />
Output power can be calculated using integration of time-averaged power outflow (nPoav).<br />
However, I don't know how to know incident power when I use scattering boundary condition, or electric field condition.<br />
Would you comment on this?<br />
<br />
<Summary><br />
1. Using same model of "Fresnel equation" library, can reflectance of a system with 3D nano structure be calculate?<br />
2. How can I calculate incident power of light, when I use electric field boudnary condition?<br />
<br />
Thanks!<br />
<br />
Dong-yeong KimWed, 09 Jan 2013 04:53:14 +000034014.1357707194.93368