Localized gap plasmon resonator

A localized gap plasmon resonator comprising:

• a pad comprising:
• a first plasmonic material to support a surface plasmon;
• and
• a first plasmon surface;
• a nanoelectromechanical (NEM) member disposed opposing the first plasmon surface of the pad and spaced apart from the pad by a plasmon gap, the plasmon gap supporting a plasmon resonance;
• and
• a plasmonic nanoprism disposed on the NEM member and comprising:
• a second plasmonic material to support a surface plasmon;
• and
• a second plasmon surface,
• such that:
• the second plasmon surface of the plasmonic nanoprism opposes the first plasmon surface of the pad;
• the second plasmon surface is parallel to the first plasmon surface;
• a distance that separates the second plasmon surface from the first plasmon surface is a size of the plasmon gap between the second plasmon surface and the first plasmon surface;
• and
• the pad, the plasmonic nanoprism, and the plasmon gap support a localized gap plasmon (LGP) mode comprising an LGP frequency, an intrinsic optical loss rate, an optical loss rate by radiation, or a combination comprising at least one of the foregoing.