What is responsible for the exhibition of side lobes of the real part of the Dielectric function of metallic material
The simplest metamaterial will follow a Lorentz shape. If multiple resonances exist close together, the overall response will be a superposition of the individual resonances. Watch the video for Lecture 2 here:
http://emlab.utep.edu/ee5390em21.htm
You may also want to take a look at Lecture 15 which discussed parameter retrieval. Perhaps you will see a similar response there.
@Raymond Rumpf
Dear Prof Raymond,
Thanks for the resource materials you provided.I appreciate it greatly.
May I ask if it is normal to have such dips or side lobes as depicted in the figure in the real part of the dielectric function of metallic material?And what is the physical meaning or interpretation to device system.Please give reasons for such dips or side lobes
Look forward to hearing from you soonest.
Best regards,
Lateef.
It is definitely normal to see artifacts like this. Resonance causes things to get a little weird. In your case, the dips are causing the real part of the dielectric function to go negative. This means E and D will be 180 degrees out of phase. I am not sure there is a deeper physical meaning until you look at how those properties affect whatever it is you are doing with the metamaterial.
Thanks@Raymond Rumpf.
I am investigating the effect of of frequency on dielectric function of metallic nanomaterial in 1D using quantum mechanical approach to study the electron transitions from initial to final state-lorentzian like model.I was just being worried why such dips occur?My reason was that at a certain frequency where transition frequency (W_if) is less than the operating frequency(w),there is bound to occur such dips.
Does this reason of mine explain such occurrence of dips in the real part of the dielectric function of material?Please clarify my assertion.
Best regards,
Lateef.
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