- This topic has 14 replies, 3 voices, and was last updated 9 years, 10 months ago by perveen akhter.
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December 18, 2014 at 12:07 am #16769Dr. Subhashish TiwariParticipant
Hello everyone,
I wanted to know, if anyone is doing some work on refractive index sensing through any type of optical fiber. On Optifdtd do we have option to get the output in terms of wavelength vs intensity or any other terms for this work.
Maybe I am not clear about the question.
Thank you
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December 18, 2014 at 9:19 am #16785Damian MarekParticipant
In OptiFDTD using an Observation area it is you could detect the transmission as a function of wavelength through a fiber (power spectrum).
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December 22, 2014 at 10:54 am #16839Dr. Subhashish TiwariParticipant
Damian, as you said ” using an Observation area it is you could detect the transmission as a function of wavelength through a fiber”. Where to find the fiber first for modelling.
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December 22, 2014 at 12:18 pm #16845Damian MarekParticipant
You will have to make a profile and draw out your fiber first. Recommend trying out the first tutorials at:
Once you see an example making a profile should be straight forward.
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December 22, 2014 at 12:26 pm #16846Dr. Subhashish TiwariParticipant
I worked on photonic crystals simulation in 2-D. For optical fiber, do the linear waveguide has to be used as optical fiber.
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December 24, 2014 at 8:55 am #16864Damian MarekParticipant
For a photonic crystal fiber you would use the photonic crystal tool to make what is called a quasi 3D crystal. A photonic crystal with 2D periodicity and which is extruded on the remaining axis. You would not be able to make the entire fiber from the profile manager, but you would use a profile to pattern the crystal.
Regards
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December 24, 2014 at 11:22 am #16867Dr. Subhashish TiwariParticipant
Perhaps you mean the cross-section of fiber
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December 22, 2014 at 12:31 pm #16847Dr. Subhashish TiwariParticipant
If any opti-designer file based on optical fiber is there, please provide me.
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December 24, 2014 at 7:29 am #16863Dr. Subhashish TiwariParticipant
Hi damian,
Please answer my query soon.
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December 21, 2014 at 10:37 pm #16830perveen akhterParticipant
Hi Damian,
I am trying to use plane wave input at 45 deg. but I feel that won’t cover my whole layout, is there any way to compensate for that, or can I move the center of input to at one end of x intsead of x=0.
thanks,
Perveen.-
December 22, 2014 at 9:31 am #16836Damian MarekParticipant
I don’t think we have an exact sample file of that type. You want to inject a plane wave at 45 degrees to an optical fiber? What is the transverse shape (Rectangular)?
If you double click the Input Plane you can change the offset of the input pulse and also the half width of the pulse.
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December 22, 2014 at 10:32 am #16838perveen akhterParticipant
no, its grating on silicon substrate.to see the coupling, I am trying input at different angles, and I am using plane wave GMCW.
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December 22, 2014 at 12:16 pm #16842Damian MarekParticipant
Hi,
I have a 2D sample file that actually might be similar to this. From the pic you can that if you double click input plane and go to the Transverse info pane you can change where your power is centered and its angle.
Regards
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January 7, 2015 at 2:57 pm #17114perveen akhterParticipant
Hi there, I am getting a lot of negative absorption (r+t>1). I changed the size and positions of the input but its still not working. can someone please help me. files are attached
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December 21, 2014 at 10:38 pm #16831perveen akhterParticipant
if you have any sample layout that would be great.
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