Nano-photodiodes with a subwavelength active area using the optical near-field enhanced by surface plasmon resonance are proposed. We fabricated a Si Schottky photodiode that consists of an active area of 300 nm in diameter and a surface plasmon antenna to generate the carrier within the active area efficiently. The fabricated photodiode shows an increase of the photocurrent by several tenfold compared to that without a surface plasmon antenna. This result suggests an enhanced photogeneration of carriers in a semiconductor via surface plasmon resonance. Such a Si nano-photodiode is a potential high-speed optical signal detector because the opto-electronic conversion process occurs within a subwavelength scale.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Publication status||Published - 2005|
- Optical near-field
- Subwavelength aperture
- Surface plasmon
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)