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Proceedings Paper

InGaAs-based resonant photodetector: a step towards a new generation (Conference Presentation)
Author(s): Jean-Luc Pelouard
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Paper Abstract

Invited abstract. The extreme light confinement provided by nanophotonic structures pushes toward revisiting the photodetector design. On the other hand introducing absorbing layers in nano-resonators demands dedicated electromagnetic design. This context opens the way for performance improvements and new functionalities, introducing the fourth generation of photo-detectors with promising features such as ultra-thin absorbing layers, device area much smaller than its optical cross-section and carved optical response. In this talk, I present a GMR InGaAs photo-detector dedicated for FPA applications, illustrating this global design and the cross-linked properties of the optical and semiconductor structures. In this "guided mode resonator", the semiconductor stack works as an optical guide. Its bottom part is structured in order to generate the first order diffraction modes in the semiconductor. Adjusting the coupling between the optical modes of the guide and those of the grating, allows optimizing this structure for various applications as optimum absorption at 1.55 μm or in the SWIR band [M. Verdun et al, Appl. Phys. Lett. 108 053501 (2016)]. The photodiode is based on an InP/InGaAs double heterojunction. The small thickness of the InGaAs absorbing layer (100 – 200 nm) allows suppressing the diffusion currents as well as reducing the generation-recombination currents in the space charge layer. It will be shown that the minimum value of the dark current is not necessarily reached for the thinnest absorbing layers. As a result, experimental data show at λ = 1.55 μm an external quantum efficiency of 75% and a specific detectivity of up to 1013 cm.√Hz.W-1.

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101111T (28 April 2017); doi: 10.1117/12.2252699
Show Author Affiliations
Jean-Luc Pelouard, Lab. de Photonique et de Nanostructures (France)


Published in SPIE Proceedings Vol. 10111:
Quantum Sensing and Nano Electronics and Photonics XIV
Manijeh Razeghi, Editor(s)

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