Waveguide-Integrated, Plasmonic Enhanced Graphene Photodetectors

Jakob E. Muench, Alfonso Ruocco, Marco A. Giambra, Vaidotas Miseikis, Dengke Zhang, Junjia Wang, Hannah F.Y. Watson, Gyeong C. Park, Shahab Akhavan, Vito Sorianello, Michele Midrio, Andrea Tomadin, Camilla Coletti, Marco Romagnoli, Andrea C. Ferrari*, Ilya Goykhman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

We present a micrometer-scale, on-chip integrated, plasmonic enhanced graphene photodetector (GPD) for telecom wavelengths operating at zero dark current. The GPD is designed to directly generate a photovoltage by the photothermoelectric effect. It is made of chemical vapor deposited single layer graphene, and has an external responsivity ∼12.2 V/W with a 3 dB bandwidth ∼42 GHz. We utilize Au split-gates to electrostatically create a p-n-junction and simultaneously guide a surface plasmon polariton gap-mode. This increases the light-graphene interaction and optical absorption and results in an increased electronic temperature and steeper temperature gradient across the GPD channel. This paves the way to compact, on-chip integrated, power-efficient graphene based photodetectors for receivers in tele- and datacom modules.

Original languageEnglish
Pages (from-to)7632-7644
Number of pages13
JournalNano Letters
Volume19
Issue number11
DOIs
StatePublished - 13 Nov 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
Copyright © 2019 American Chemical Society.

Keywords

  • Graphene
  • integrated photonics
  • photodetectors
  • photothermoelectric effect
  • plasmonics

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