Patent ID: 8349546

Claim:
A method of fabricating a nano-ring structure by nano-lithography, comprising the steps of: (a): first, depositing a sealant in a gaseous state on a top-opening of a nano cylindrical pore formed on a preset photo-resist on a substrate so that a diameter of said top-opening is gradually reduced to become a first reduced nano-aperture having an opening diameter that is smaller than the diameter of said top-opening; (b): second, directly passing a first deposit material in a gaseous state through said first reduced nano-aperture so that a core nano quantum dot of the nano-ring structure is directly formed on a surface of said substrate, said core nano quantum dot being laid beneath the bottom of said nano cylindrical pore; (c): third, removing the sealant, which is deposited on the top opening of the first reduced nano-aperture, to recover the diameter of the top-opening on said nano cylindrical pore; (d): fourth, re-depositing the sealant on the top-opening of the nano cylindrical pore so that the diameter of said top-opening is gradually reduced to become a second reduced nano-aperture, whose opening diameter is smaller than that of said top-opening but larger than that of the first reduced nano-aperture; (e): fifth, directly passing a second deposit material in a gaseous state through said second reduced nano-aperture so that an ambit nano quantum dot of the nano-ring structure is directly formed on the surface of said substrate, said ambit quantum dot being laid beneath the bottom of said nano cylindrical pore; (f): sixth, by means of solution rinsing or gas etching, removing both of the nano cylindrical pore and the photo-resist on the substrate; and (g): finally, after removing the nano cylindrical pore and the photo-resist, by means of etching the first deposit material, selectively removing the first deposit material in an area of said core nano quantum dot so that a nano-ring structure is directly formed on the substrate by the second deposit material existing between an outer circumference of the core nano quantum dot and an inner circumference of the ambit nano quantum dot.