I recently asked this question: What is the minimum number of metal atoms necessary to make a mirror?
However it seems I did not make myself clear enough about what I was looking for, even though the question evidently captured interest. So I decided I would reboot, using a different approach.
I am still looking for a minimum mirror made of metal able to reproduce the typical household mirror properties (flat reflection of most incoming visible light).
It was clear to me that a Faraday cage is an example of mirror to electromagnetic radiation that does not require a continuous sheet of metal to operate, i.e. it is a grid. So I asked about the metal density and layout, not just the external size.
There is a question relevant to this one here: What is the relationship between Faraday cage mesh size and attenuation of cell phone reception signals?
I say relevant not because of the question title but because there is a mention of Faraday cages being actual mirrors.
So I am not asking just about the overall size of the minimum mirror, nor just about the spacings of the grid, all being proportional to the wavelength of the incoming light in some way, but also and foremost about the number of atoms necessary and sufficient because this number must take into account other parameters, for example: the number of atoms sufficient to sustain an optical grid (is a one atom wide cable sufficient and possible?), the effects of the width and location of holes on the phase, polarization, etc.
The minimum mirror should be able to reflect any visible light wavelength still respecting the household mirror reflection style, i.e. not just making radiation bounce randomly.
The fact a Faraday cage is not a continuous sheet of metal means the radiation is not reflected by a continuous bed of conduction electrons either and I would appreciate some details about the microscopic physical mechanisms at play, as this seems contradictory with the reflection produced by a gas of delocalized electrons.