Recent content by faryafada

Hi, I want to know what is the proper boundary condition in COMSOL RF module to study optical interactions, Scattering BC and PML? or what is the difference between them? also I want to know if the rules are different for application of these two BCs in far-field and near-fields studies...

Thanks. Quite useful! :)

I see the term o"ptical frequency" in some articles. From Wikipedia I read that it means the whole EM spectrum. But something says to me it may be only the visible part of the spectrum. Now, which definition is correct? Thanks

Sure, this is the paper link http://dx.doi.org/10.1364/JOSAB.23.002383 There is not much information about source there, the pulse source was just my idea/question!

I've been reading articles about this consistently during these two days, I have no problem with constructive/destructive interference. I have another question now, is every diffraction order a portion of the initial incident light being propagated within the medium to produce other diffraction...

I know the theory, also the equation for k'= k+ n 2 pi/period, n being the diffraction order. I want a more physical interpretation. How is it possible that the wavelength is changed when you say at one wavelength away?

Can someone please describe the diffraction orders on a nano-grating? I am reading articles about imaging devices, and I cannot understand the diffraction orders For example, incident wave can be mapped into a propagating wave through the -1, 0, and+1 diffraction orders. Is any of these...

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.115403 Please read the abstract, A finite-sized ultrathin metallic slab is used to encode subwavelength details of the broadband field radiated by an object.

In a far field imaging system

Is broadband field, a wave that contains a range of wavelengths? I can not find a good definition for it

Can diffraction be explained for tilted light arrays or only normal incident lights can have diffraction orders?

I have initial information about both waves and their characteristics but I am confused to find a relation between the two when it comes to make a comparison.

What is the relation between these two concepts?

Thanks for your explanation, Sophie. I know something about bandwidth but I am concerned about any theoretical solution for measuring bandwidth, if any. i.e. how is it possible to measure the bandwidth if I have the current (I output) results for a photodetector?

It is a PIN photodiode and I am in simulation level. not any experimental work yet. Is it possible to measure bandwidth in simulation level or you need to build and measure it?