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Proceedings Paper

Plasmonics-integrated Ge PIN-photodetectors: efficiency enhancement by Al nanoantennas and plasmon detection
Author(s): Inga A. Fischer; Lion Augel; Songchai Jitpakdeebodin; Nuno Franz; Simon Fleischer; Jörg Schulze
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Paper Abstract

The aim of integrating plasmonic functionality with photonic devices is twofold: on the one hand, plasmonic nanoantennas can enhance the functionality of photonic devices and enable their miniaturization. On the other hand, photonic devices can be a part of plasmonic transmission lines and act e.g. as plasmon detectors. Here, we present results on both aspects in a CMOS-compatible device setup using Ge PIN-photodetectors and Al nanostructures. Plasmonic nanoantennas are metallic nanostructures that enable the control and manipulation of optical energy in the visible and near-infrared spectrum and have been proposed as a means to enhance absorption and quantum yields for photovoltaics, to increase spatial resolution for optical microscopes and to enhance the energy efficiency of light-emitting devices. We present experimental results on the enhancement of Ge PIN-photodetector efficiency by Al nanoantennas. In order to investigate plasmon waveguiding and detection, metal grating structures and metal-insulator-metal slot waveguides were fabricated by electron beam lithography in the Al metallization layer of Ge PIN-photodetectors. Photocurrent maps of the devices under local illumination show that plasmons can be optically excited at the grating and are then guided by the slot waveguide towards the Ge PIN-photodetector where they are detected as photocurrent. Using Ge PIN-photodetectors and Al nanostructures as a CMOS-compatible device setup, we show how plasmonic nanostructures can be used for efficiency enhancement of photonic devices and discuss plasmon detection with Ge PIN-photodetectors with possible applications.

Paper Details

Date Published: 15 June 2015
PDF: 6 pages
Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 965404 (15 June 2015); doi: 10.1117/12.2192161
Show Author Affiliations
Inga A. Fischer, Univ. Stuttgart (Germany)
Lion Augel, Univ. Stuttgart (Germany)
Songchai Jitpakdeebodin, Univ. Stuttgart (Germany)
Nuno Franz, Univ. Stuttgart (Germany)
Simon Fleischer, Univ. Stuttgart (Germany)
Jörg Schulze, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 9654:
International Conference on Optics and Photonics 2015
Kallol Bhattacharya, Editor(s)

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