Methods for fabricating high aspect ratio probes and deforming high aspect ratio nanopillars and micropillars
Methods for fabricating of high aspect ratio probes and deforming micropillars and nanopillars are described. Use of polymers in deforming nanopillars and micropillars is also described.
1. A method for deforming pillars comprising:
providing a plurality of pillars extending from a substrate, the pillars and the substrate being made of a first material;
partially submerging the pillars in resist made of a second material different from the first material; and
controllably contracting the resist by applying to the resist a radiation cross-linking dose having a value at least ten times that of a standard radiation cross-linking dose for the resist, thereby turning the resist into a negative tone resist;
selectively removing part of the resist; and
controllably and selectively bending the plurality of pillars.
2. The method of claim 1 , wherein the resist is made of Poly methyl methacrylate (PMMA).
3. The method of claim 2 , wherein the applying to the resist a radiation cross-linking dose comprises using an electron-beam.
4. The method of claim 3 , further comprising varying an electron-beam exposure or heating, thereby tuning a force exerted by the PMMA to the plurality of nanopillars.
5. A method for capturing small-scale objects comprising:
providing a plurality of small-scale objects surrounded by a plurality of pillars extending from a substrate, the pillars and the substrate being made of a first material;
partially submerging the pillars in resist made of a second material different from the first material,
controllably contracting the resist by applying to the resist a radiation cross-linking dose having a value at least ten times that of a standard radiation cross-linking dose for the resist, thereby turning the resist into a negative tone resist;
selectively removing part of the resist; and
controllably and selectively bending the plurality of pillars, thereby squeezeing the plurality of small-scale objects and thereby forcing the plurality of small-scale objects through top of the plurality of pillars.
6. The method of claim 5 , wherein the small-scale objects have spherical shapes with diameters of 50 nm or more.
7. The method of claim 5 , wherein the resist is made of poly methyl methacrylate (PMMA).
8. The method of claim 7 , wherein the applying to the resist a radiation cross-linking dose comprises using an electron-beam.