Photonics

Photonics

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ENZ metamaterial for ultra high sub-diffractional resolution micoscopy

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    • Patrik_micek
      Subscriber

      Greetings, I have asked this question some time ago, however I got covid so was not able to answer to emails and the thread got locked (support.lumerical.com/hc/requests/89138). I try to model a hyperbolic layered metamaterial consisting of silver and SiO2 layer. In the simulation I represent this metamaterial by a bulk effective material with corresponding anisotropic permittivity. I managed to model my Hyberbolic metamaterial and sufficiently introduce the model into the FDTD. Herein I include the permittivity of the metamaterial. You can clearly see that near the 360 nm wavelength the material exhibit Epsilon near zero (ENZ) behavior.

    • Guilin Sun
      Ansys Employee
      I guess that the diffraction is so strong that it does not propagate long and the efficiency is very low. You may still find some focus by use of log scale.
      In addition, You mentioned that you used two slits but the figures in the paper seems to have some confined field propagation:

      The mode from the waveguides might not have so strong diffraction.
      BTW: Please also check the material property and see it it is what you imported.


    • Patrik_micek
      Subscriber
      Hello again, I trtied everything you mentioned, the materials are okay, I implemented two waveguides to address the high diffraction efficiency of the diffracting sources. In the epsilon-near-zero regime (358-361 nm) the profile looks like this
      Which does not look like anything in the former mentioned study.

    • Guilin Sun
      Ansys Employee
      have you tried using the log scale? This device has extremely low efficiency, as majority of the field intensity is localized, non-propagating.
      You may also try mode sources instead of plane wave source.
      So try log scale and mode source.
      You may refer this post to get more info in order to find the cause of differences: Ansys Insight: Why my simulation result is different from published paper or experiment?
      We do not have similar examples so please try your best.
    • Patrik_micek
      Subscriber
      I managed to obtain the before discussed behavior. Thanks for the advice, the log-scale was not needed in the end.
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