June 1, 2023 at 6:27 amceshi xiazaiSubscriber
I set a dipole source inside a paramid microcavity to see the resonance mode with a center wavelength of 840nm and the span is 60nm.
(which is supposed to be 420nm because I wanna investigate the SHG signal inside the cavity. I set it mistakenly to 840nm)
Then I set a point DFT monitor to get the spectrum inside the cavity to see the peaks.
Accidently, I got the exact result that I wanted. I did not set a chi2 or chi3, just taking the material as a sampled 3D material.Why did I get a enhanced peak at around 420nm?I am very very very confused about all of this stuff.
June 5, 2023 at 5:56 pmGuilin SunAnsys Employee
This is mainly due to the source pulse: even though you set a single wavelength source, since the injection is a pulse, and its spectrum is a Gaussian shape with extremly broadband. Thus you can find reult at 420nm. Please check.
June 7, 2023 at 2:44 amceshi xiazaiSubscriber
Then why cannot I get any peaks from a spectrum monitor with around 840nm when the wavelength of the dipole source is 840nm
June 7, 2023 at 4:37 pmGuilin SunAnsys Employee
let me first summarize your question:
you mistakenly used 840nm source and the correct one should be 420nm; you found there was a peak at 420nm without nonlinear material. Then you expect to find a peak at 840nm. right?
Whether the wavelength has the peak or not depends on the device interaction with light: when it satifies the resonance condition it will have a peak. FOr exmaple around 420nm the phase difference is to constructive (eg phase difference is pi) so it has a peak. However 840nm may not becuase its optical path difference is less than pi, probably just around half pi.
Please review intererence of two light beams.
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