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If the electric field from a concentrated laser is strong enough it can spark the air and make a voxel.

Yes, this is much more practical. Short pulses to create a tiny ball of plasma that doesn't expand very much, but which can emit enough light to see. Still not what we want (which is Star Trek), but probably quite fun as long as the total volume of plasma stays small enough to be safe.

If you want Star Trek ( and so do I, of course :) ) then the simplest way I can imagine has to be with headsets as currently is.

Making them imperceptible, if that is even so important, has some challenges but not impossible (e.g. increasing resolution, lowering weight, or even adding devices to compensate its weight if the former is infeasible).

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