Szymon,
Have you also tried running your simulation longer (or to a lower
decay-by value)? This could clear up your oscillations.
If you're using run-until or run-sources+ with a fixed time, try
successively doubling the time and check the improvement. If using
decay-by, keep dividing by a factor of 10.
Best,
Matt
On Mon, 8 Dec 2008, Szymon Lis wrote:
> Yes. I know that we can observe small oscillation, when amplitude is
> small (especially on edge of source spectrum). But even for different
> resolutions (even better) I have got oscillations in middle frequency
> region as well. And that oscillations are quite big. And I have found
> that the position of detector regards to PhC and source influence on
> this phenomena. Unfortunately sent graph include only the best result.
> I was wondering how I can solve this problem. I think the best option
> will be try do this work for few different sources with different
> central frequency. And assemble results to one to compare with result
> for one wider source. It is idea, I try in near future. Anyway I
> wonder what causing this problem, not this small oscillation on edge
> of spectrum, but this big oscillation in middle.
>
> Thank you,
> Szymon
>
> ___________
> Szymon Lis
> Photonics Group
> Faculty of Microsystem Electronics and Photonics
> Wroclaw University of Technology
> ul. Janiszewskiego 11/17, 50-372 Wroclaw, POLAND
>
> Tel. +48 (71) 320 3735
> Fax. +48 (71) 328 3504
>
> ----- Original Message -----
> From: "G. O. Nikiforov" <[EMAIL PROTECTED]>
> Date: Monday, December 8, 2008 1:50 pm
> Subject: Re: [Meep-discuss] Oscillation in reflection spectrum
> To: Szymon Lis <[EMAIL PROTECTED]>
> Cc: meep discuss <[email protected]>
>
>
>> Dear Szymon,
>>
>> Just glancing at your graph, those oscillations resemble very much the
>>
>> oscillations in one of the Meep examples:
>>
>> http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial/Band_diagram%2C_resonant_modes%2C_and_transmission_in_a_holey_waveguide
>>
>> The explanation they give is: "There is also some high-frequency
>> oscillation visible at the left of the plot, which is a numerical
>> artifact due to our pulse not having enough amplitude in that range."
>>
>> It looks like you are seeing a similar thing.
>>
>> George
>>
>> Szymon Lis wrote:
>>> Hi Meep users,
>>>
>>> My problem in meep are strange oscillation in reflection spectrum
>> form cavity waveguide. The reflection graph are attached. That is my
>> the best result. When I try different resolution, or/and various
>> distances between source and phc oscillation are bigger. Even reach
>> 1.4 reflection!. I don't know what exactly it is? Numerical error? How
>> to avoid it?
>>>
>>> Thank you.
>>> Szymon
>>>
>>>
>>> ___________
>>> Szymon Lis
>>> Photonics Group
>>> Faculty of Microsystem Electronics and Photonics
>>> Wroclaw University of Technology
>>> ul. Janiszewskiego 11/17, 50-372 Wroclaw, POLAND
>>>
>>> Tel. +48 (71) 320 3735
>>> Fax. +48 (71) 328 3504
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>> ------------------------------------------------------------------------
>>>
>>> _______________________________________________
>>> meep-discuss mailing list
>>> [email protected]
>>> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
>>
>
>
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