Hello! First time poster. I hope this is not a wrong sub-forum for this kind of question. Can anyone tell me where can I find values for dielectric constants of neurons and nerve fibers for frequencies in the range of 1e12 - 1e14 Hz (optical and RF part of the spectrum)? I have found data only up to 1e11 Hz (Gabriel 1996 - The dielectric properties of biological tissues: III), and most of the other works cover frequencies up to GHz.