InGaAs nano-photodiode enhanced using polarization-insensitive surface-plasmon antennas

Daisuke Okamoto, Junichi Fujikata, Keishi Ohashi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We propose InGaAs nano-photodiodes incorporated with a ring-type polarization-insensitive surface-plasmon (SP) antenna, which consists of gold concentric-ring gratings. This ring antenna induces SP resonance for any polarization of incident light and enhances light absorption in a thin InGaAs layer owing to its symmetric structure. Finite-difference time-domain simulations suggest that the carefully designed ring SP antenna can achieve a quantum efficiency of more than 70% for a wide wavelength range and a maximum efficiency of about 80%. A 3 dB bandwidth of 21 GHz and an external responsivity of 0.39A/W were experimentally demonstrated at a 1.55 μm wavelength.

Original languageEnglish
Article number120201
JournalJapanese Journal of Applied Physics
Volume50
Issue number12
DOIs
Publication statusPublished - 2011 Dec
Externally publishedYes

Fingerprint

Photodiodes
photodiodes
antennas
Polarization
Antennas
rings
polarization
Wavelength
Surface plasmon resonance
Quantum efficiency
Light absorption
electromagnetic absorption
Gold
surface plasmon resonance
wavelengths
Bandwidth
quantum efficiency
gratings
gold
bandwidth

ASJC Scopus subject areas

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

Cite this

InGaAs nano-photodiode enhanced using polarization-insensitive surface-plasmon antennas. / Okamoto, Daisuke; Fujikata, Junichi; Ohashi, Keishi.

In: Japanese Journal of Applied Physics, Vol. 50, No. 12, 120201, 12.2011.

Research output: Contribution to journalArticle

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