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HE and EH modes
Posted 30.08.2011, 07:22 GMT-4 RF & Microwave Engineering Version 4.4 2 Replies
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Hy guys,
is there any difference between EH and HE modes in the Hybrid Mode Waves application mode?
When I choose Hybrid Mode Waves what kind of modes I´ll get ? EH or HE?
Depend this on the choice of "solved for: magnetic field (electric field)" in the physical settings?
Many Thanks in advance
Susette
is there any difference between EH and HE modes in the Hybrid Mode Waves application mode?
When I choose Hybrid Mode Waves what kind of modes I´ll get ? EH or HE?
Depend this on the choice of "solved for: magnetic field (electric field)" in the physical settings?
Many Thanks in advance
Susette
2 Replies Last Post 07.05.2015, 03:41 GMT-4
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Posted:
1 decade ago
Really nobody?
This can´t be!
This can´t be!
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Posted:
9 years ago
Hey,
It's like this: the TE-like modes having the main E field component (but not only) along the x axis (parallel to the surface) and the quasi-TM or TM-like modes are referred to as Ey_mn having Ey as the major component of the E field (perpendicular to the surface).
To get a feeling for this mode behavior and the range of your effective indices you can analytically calculate the wanted effective refractive indices by ERIM (effective refractive index method) cos here you need the distinction between the two polarization states. Anyhow, before you calculated your field distribution by COMSOL you need to selected proper boundary conditions depending on what you want to know. In the Model Builder in the setting section I selected in the section “Electric field components solved for: three component vector”. This choice determines what polarizations can be handled (we want TE and TM so we need all components). Now, how to distinguish between TE an TM polarization in COMSOL?
As you can see, I solved a 2DIM waveguide with a core of 1.97, air cladding and sio2 box layer on a Si substrate. I've used Electromagnetic Waves - Frequency Domian - Mode analysis.
For plotting this field distribution I’ve selected the Ex component to plot the TE polarization and the Ey component (for the specific effective index) for the TM mode.
This is identical with the explanation before.
However, the obtained field profiles of the fundamental TE and TM modes clearly show that the fundamental TE mode is characterized by much higher field intensity at the side walls (as well as a higher refractive index), whilst the TM mode has much higher amplitude at the top and bottom interface.
many regards
susette
It's like this: the TE-like modes having the main E field component (but not only) along the x axis (parallel to the surface) and the quasi-TM or TM-like modes are referred to as Ey_mn having Ey as the major component of the E field (perpendicular to the surface).
To get a feeling for this mode behavior and the range of your effective indices you can analytically calculate the wanted effective refractive indices by ERIM (effective refractive index method) cos here you need the distinction between the two polarization states. Anyhow, before you calculated your field distribution by COMSOL you need to selected proper boundary conditions depending on what you want to know. In the Model Builder in the setting section I selected in the section “Electric field components solved for: three component vector”. This choice determines what polarizations can be handled (we want TE and TM so we need all components). Now, how to distinguish between TE an TM polarization in COMSOL?
As you can see, I solved a 2DIM waveguide with a core of 1.97, air cladding and sio2 box layer on a Si substrate. I've used Electromagnetic Waves - Frequency Domian - Mode analysis.
For plotting this field distribution I’ve selected the Ex component to plot the TE polarization and the Ey component (for the specific effective index) for the TM mode.
This is identical with the explanation before.
However, the obtained field profiles of the fundamental TE and TM modes clearly show that the fundamental TE mode is characterized by much higher field intensity at the side walls (as well as a higher refractive index), whilst the TM mode has much higher amplitude at the top and bottom interface.
many regards
susette