Multi-scale cantilever structures having nano sized holes and method of preparing the same

A method of preparing a multi-scale cantilever structure, comprising:

• forming an alumina layer having a plurality of nano-sized holes by anodic oxidizing an aluminum substrate;
• forming a first structure by sequentially depositing a metal thin film layer and a photoresist layer on the alumina layer;
• forming a photoresist layer pattern having a convex cross section by arranging a mask having a pattern of a convex cross section on the first structure and then exposing the photoresist layer to light and developing the photoresist layer;
• forming a metal thin film layer pattern having a convex cross section by wet etching the metal thin film layer using the photoresist layer pattern as a mask and a metal etching solution to remove the metal thin film layer on a region that is not covered by the pattern;
• forming a second structure having a convex cross section by wet etching the alumina layer using the metal thin film layer pattern as a mask and an alumina etching solution to remove the alumina layer that is not covered by the metal thin film layer pattern;
• and
• forming a cantilever separated from a surface of the first region of the aluminum substrate by electro-polishing the aluminum substrate to remove, by a surface reaction, a top portion of the aluminum substrate in the first region which is not covered by the second structure.