Structures for Enhancement of Local Electric Field, Light Absorption, Light Radiation, Material Detection and Methods for Making and Using of the Same.

A nanodevice comprising:

• (a) a substrate;
• and
• (b) one or a plurality of pillars extending from a surface of the substrate, wherein at least one of said pillars comprises:
• i. a metallic disc on top of the pillar;
• ii. a metallic back plane at the foot of the pillar, said metallic back plane covering a substantial portion of said substrate surface near the foot of the pillar;
• iii. a metallic dot structure on sidewall of the pillar;
• and
• iv. a molecular adhesion layer that covers at least a part of said metallic dot structure, said metal disc, and/or said metallic back plane;
• wherein said nanosensor amplifies a light signal that is proximal to the exterior surface of said adhesion layer.