Can we send light through an aperture having the size less than the wavelength of incident light?

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Yu. M. Kharchenko

https://en.wikipedia.org/wiki/Aperture

Paul Howard Riley

The semiconductor industry has found ways to do this using optical proximity correction and phase-shifting masks.

Have a look at this paper and its references.

http://www.sliponline.org/Publications/Conferences/98/c98.pdf

Best Regards

Paul

Hyeongjin Ahn

if there are very narrow aperture like slit,

then just like point source oscillating, light can pass through and spreas widely

Abbas Majidi Bidgoli

yes. It is possible and physical reason behind this phenomenon is explained with 'near field optics' theory.

below link give useful information to you:

http://www.nature.com/nature/journal/v445/n7123/box/nature05350_BX1.html