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Hi Adam;
I'll have to confess that in spite of the views expressed in my OP, I think I'd have to guess that this effect is more a function of clever engineering, than necessarily an unexpected fundamental property of light.
It looks as though the interference patterns around the hole/cap interface acts constructively, provided the ratio of hole diameter/cap diameter, gap size, and hole spacing, are all engineered specifically to get the increased light levels. They could probably engineer these dimensions to obtain the opposite effect .. ie: increased blockage of light.
What you question … seems to be about altering the dimensions even more, altering the light coherency/source, and aligning the holes/caps specifically to maybe amplify the effect even more. I guess this could be done .. but it would have to be a matter of tuning the device to get the desired effect (whatever that may be).
I guess my point about the thread, is that one usually expects that if a light gap is plugged, it will block out the light. At this level of granularity of detail, the results seem almost inconceivable. I think the level of detail is the difference maker here.
Microscopic details can make the macroscopic world seem counterintuitive.
… A very easy factor to forget in science !
Cheers
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