Dear Colleagues,
I use CST MWS to design plasmonic nanoantennas at THz frequencies. In this regard, I would like to design a point emitter that has it's resonance at around 670 nm and should be a chiral emitter. (i.e), the radiation emitted from the source should be of circular polarization.
To fulfill my criteria, I am using two point like dipoles (Dipole: two PEC rods that are connected by discrete port having an impedance of 50 ohms), one that is oriented in the horizontal and the other is oriented in the vertical direction. Now, may I know how do I get them to emit maximum radiation at around 670 nm and how do I introduce a phase difference between the dipoles such that the dipoles emit circular polarized radiation?
I shall be sincerely thankful for addressing this query.
First of all, what you describe is a circularly polarized, but not a chiral emitter, which is a completely different story.
I have little experience with CST, but I believe it must be possible to set the phase of each individual port (in your instance, you have two ports) with respect to the global phase, from what I know about CST it's definitely possible. The phase difference between them must be Pi/2.
I agree with Denis that the emitter described in the question is not a chiral emitter, although in the far-field its radiation is circularly polarized. To my impression in CST the discrete port does not support complex-valued impedence/voltage/current, so introducing a phase difference between the two ports may not be straightforward. I found another thread that could be helpful: https://www.researchgate.net/post/A_complex_impedance_in_cst_discrete_port
but unfortunaltely I don't have CST to hand now and cannot give it a shot.
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