Plasmonics-integrated Ge PIN-photodetectors: efficiency enhancement by Al nanoantennas and plasmon detection

Inga A. Fischer; Lion Augel; Songchai Jitpakdeebodin; Nuno Franz; Simon Fleischer; Jörg Schulze

doi:10.1117/12.2192161

15 June 2015 Plasmonics-integrated Ge PIN-photodetectors: efficiency enhancement by Al nanoantennas and plasmon detection

Inga A. Fischer, Lion Augel, Songchai Jitpakdeebodin, Nuno Franz, Simon Fleischer, Jörg Schulze

Author Affiliations +

Proceedings Volume 9654, International Conference on Optics and Photonics 2015; 965404 (2015) https://doi.org/10.1117/12.2192161
Event: International Conference on Optics and Photonics 2015, 2015, Kolkata, India

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.

Citation Download Citation

Inga A. Fischer, Lion Augel, Songchai Jitpakdeebodin, Nuno Franz, Simon Fleischer, and Jörg Schulze "Plasmonics-integrated Ge PIN-photodetectors: efficiency enhancement by Al nanoantennas and plasmon detection", Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 965404 (15 June 2015); https://doi.org/10.1117/12.2192161

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