-------- Original Message -------- From: coderman <[email protected]> Apparently from: [email protected] To: Juan <[email protected]> Cc: [email protected] Subject: Re: Focusing x-rays Date: Tue, 22 Sep 2015 20:31:26 -0700
> On 9/22/15, Juan <[email protected]> wrote: > > ... > > Isn't it possible to focus any sort(frequency) of EM wave, at > > least in theory? > > in theory, with "metamaterials", yes. > > in practice this is akin to the perfect invisibility cloak problem, > full of devilish details... > > a full spectrum Superlens for any EM freq would be quite handy indeed :) Most metamaterials perform their magic using plasmas which form inside the material. These plasmas can absorb, reflect, refract, etc. but there are cut-off frequencies related to the energy of the plasma vs. the energy of photons.
