-------- Original Message -------- From: coderman <coderman@gmail.com> Apparently from: cypherpunks-bounces@cpunks.org To: Juan <juan.g71@gmail.com> Cc: cypherpunks@cpunks.org Subject: Re: Focusing x-rays Date: Tue, 22 Sep 2015 20:31:26 -0700
On 9/22/15, Juan <juan.g71@gmail.com> 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.
On 9/22/15, wirelesswarrior@safe-mail.net <wirelesswarrior@safe-mail.net> wrote:
... 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.
indeed. and while new "nano-meta-materials" or even larger composites are being developed at reasonable operating temperatures, these too suffer from same limitations of range. so an idealized metamaterial implementing a superlens is what we want, even if hopelessly distant technology wise... one day! :P best regards,
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