Hello everyone. I am a fresh Ph.D. candidate who studies Mie resonators.
I am confused about the discrepancy between the measurement and simulated spectra. In the simulation, the reflectivity of the electric dipole (ED) and the magnetic dipole (MD) modes is approaching 1. Nevertheless, the measured spectrum merely shows good agreement for the MD mode. There is a large discrepancy for the ED mode as shown in the following figure.
Since most of the papers only show the simulated results, I still cannot find a paper which discusses the situation till now except Parikshit Moitra's paper.
"Moitra, Parikshit, et al. "Large-scale all-dielectric metamaterial perfect reflectors." ACS Photonics 2.6 (2015): 692-698. "
They mentioned that the electric mode leaks into the region between Mie resonators. They increased the height (aspect ratio) of the Mie resonators and achieved good agreement between the simulations and experiments in their paper.
As a noob, I think the E field of the ED modes is always partially outside the Mie resonator no matter what the aspect ratio of the Mie resonators.
So, could you please inform me of any papers which may solve my problem or briefly describe the mechanism of the difference between the measurement and experiment results?
I am appreciated if you could give me some suggestions.
Thank you very much.
Hi Rongyang Xu ,
fisrt of all, when you talk about reflection from a Mie resonator, do you imply a single nanoparticle, or an array of those?
Next, the ED and MD resonances indeed have different field distribution inside the particles, which partly explains different Q-factors. But in optics there are always discrepancies between theory and experiment no matter how well your system is designed.
Hi Denis G. Baranov. Thank you very much for your answer.
The reflection spectrum of the measurement results is achieved by measuring a 10000 microns square array.
I have a very foolish question. I appreciate it if you could give me some hint.
As you said, the ED and MD have different field distribution inside the Mie resonator. The MD mode generally is well confined inside the particle when the ED mode is partially concentrated in the center of the particle. Part of the field locates is outside of the particle. Will it result in worse confinement compared to the MD mode?
Could you please also inform me of several possible reasons for the discrepancies between theory and experiment? The reasons I know are inhomogeneous broadening and different dielectric constant between simulated materials and real materials.
Thank you very much. Have a nice day.
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