Photodetector using surface-plasmon antenna for optical interconnect

Keishi Ohashi, Junichi Fujikata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

We used a surface-plasmon antenna to obtain small photodetectors for LSI on-chip optical interconnection by using near-field light generated by the antenna. Such near-field devices are not constrained by the diffraction limit and they offer an approach to integrated nanoscale photonic devices. A small semiconductor structure is located near the antenna to absorb the near-field light. This structure can be made as small as the Schottky depletion layer, so the separation between electrodes can be reduced to almost the size of the near-field region. We have demonstrated a "Si nano-photodiode" or plasmon photodiode that uses the near-field localized in a subwavelength region, which is usually relatively large in size because of the long absorption length for Si (∼10 μm at a wavelength of ∼800 nm). The Si nano-photodiode has a fast impulse response with a full-width at half-maximum of ∼20 ps even when the bias voltage is small (∼1 V or less). We demonstrated an on-chip optical interconnect chip to operate circuitry in an LSI chip by using waveguide-coupled Si nano-photodiodes.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages21-32
Number of pages12
Volume1145
Publication statusPublished - 2008
Externally publishedYes
Event2008 MRS Fall Meeting - Boston, MA
Duration: 2008 Dec 12008 Dec 5

Other

Other2008 MRS Fall Meeting
CityBoston, MA
Period08/12/108/12/5

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Ohashi, K., & Fujikata, J. (2008). Photodetector using surface-plasmon antenna for optical interconnect. In Materials Research Society Symposium Proceedings (Vol. 1145, pp. 21-32)