Numerical study of near-infrared photodetectors with surface-plasmon antenna for optical communication

Daisuke Okamoto*, Junichi Fujikata, Kenichi Nishi, Keishi Ohashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


We propose an InP-based nanoscale metal-semiconductor-metal photodiode with a surface plasmon antenna composed of gold slit arrays for optical communication systems. Resonant modes of the surface plasmon antenna are numerically simulated by the finite-difference time-domain method. The calculation results suggest the advantage of the hybrid mode, which is produced by a Wood-Rayleigh anomaly mode and a vertical cavity mode. The hybrid mode enables a quantum efficiency of more than 50% when using a 250-nm-thick InGaAs absorption layer. A higher efficiency of about 95% can be achieved by combining a surface plasmon antenna with a distributed Bragg reflector consisting of 20 periods of quarter-wave InP/InGaAsP layers.

Original languageEnglish
Pages (from-to)2921-2923
Number of pages3
JournalJapanese journal of applied physics
Issue number4 PART 2
Publication statusPublished - 2008 Apr 25
Externally publishedYes


  • Compound semiconductor
  • Distributed bragg reflector
  • Finite-difference time-domain method
  • Metal-semiconductor-metal photodiode
  • Optical communication
  • Subwavelength grating
  • Surface plasmon

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


Dive into the research topics of 'Numerical study of near-infrared photodetectors with surface-plasmon antenna for optical communication'. Together they form a unique fingerprint.

Cite this