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What is the material or metamaterial that is a very good dielectric and has a very high refractive index at least in frequencies below $500\ MHz$?

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Single crystal CCTO has a reported $\epsilon=10^5$. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6625108/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6223690/

A very stable dielectric is HfO2: "The advantage for transistors is its high dielectric constant: the dielectric constant of HfO2 is 4–6 times higher than that of SiO2." https://en.wikipedia.org/wiki/Hafnium_dioxide

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  • $\begingroup$ Thanks for your answer. Can you please tell me where can i find the refractive index value that you said? $\endgroup$
    – Pedro
    Commented Jul 2, 2020 at 12:39
  • $\begingroup$ The paper is have you is of 2019 so it should be up to date. On Wikipedia you will find a top level overview of dielectrics, and you should use $\epsilon = n^2$. I am sure there is more behind pay walls and in patents. $\endgroup$
    – my2cts
    Commented Jul 2, 2020 at 14:33
  • $\begingroup$ I corrected the typo. $\endgroup$
    – my2cts
    Commented Jul 2, 2020 at 15:24

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