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Domain size for RF module problem

Posted 23.05.2020, 21:59 GMT-4 MEMS & Nanotechnology, RF & Microwave Engineering, Wave Optics, Geometry Version 5.4 1 Reply

Skandan Chandrasekar
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I am trying to get the scattering cross section and E field for a nanoparticle suspended in a water domain. The water domain is spherical in shape. The largest wavelength I will be using is 940nm. Should the radius of the water domain be set to something larger than that like 1000nm?

1 Reply Last Post 23.05.2020, 23:41 GMT-4
Robert Koslover Certified Consultant
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Posted: 5 years ago 23.05.2020, 23:41 GMT-4

That seems reasonable to me, although I don't do problems like that very often, so take my advice with a grain of salt. Anyway, if you want to be sure, simply do several runs with different size domains and compare! Mesh (how fine or coarse) and choice of element order (linear, quadratic, etc.) may make a difference too. In part, your choices will come down to how much inaccuracy you are willing to tolerate, how fast your computer is, how much memory you have, etc. (By the way, I presume the wavelength you are referring to is in the water, not the wavelength in free space.) Finally, if everything is nicely spherical, isn't it possible that this might be an already analytically-solved problem, and so you can (more or less) look up the answer in the literature? Or are you, perhaps, trying to validate the code? :)

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Scientific Applications & Research Associates (SARA) Inc.
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That seems reasonable to me, although I don't do problems like that very often, so take my advice with a grain of salt. Anyway, if you want to be sure, simply do several runs with different size domains and compare! Mesh (how fine or coarse) and choice of element order (linear, quadratic, etc.) may make a difference too. In part, your choices will come down to how much inaccuracy you are willing to tolerate, how fast your computer is, how much memory you have, etc. (By the way, I presume the wavelength you are referring to is *in the water*, not the wavelength in free space.) Finally, if everything is nicely spherical, isn't it possible that this might be an already analytically-solved problem, and so you can (more or less) look up the answer in the literature? Or are you, perhaps, trying to validate the code? :)

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