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Field-effect silicon-plasmonic photodetector for coherent T-wave reception

Muehlbrandt, S. 1,2; Harter, T. 1,2; Füllner, C. 1; Ummethala, S. 1,2; Wolf, S. 1; Bacher, A. 2; Hahn, L. 2; Kohl, M. 2; Freude, W. 1; Koos, C. 1,2
1 Institut für Photonik und Quantenelektronik (IPQ), Karlsruher Institut für Technologie (KIT)
2 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


Plasmonic internal photoemission detectors (PIPED) have recently been shown to combine compact footprint and high bandwidth with monolithic co-integration into silicon photonic circuits, thereby opening an attractive route towards optoelectronic generation and detection of waveforms in the sub-THz and THz frequency range, so-called T-waves. In this paper, we further expand the PIPED concept by introducing a metal-oxide-semiconductor (MOS) interface with an additional gate electrode that allows to control the carrier dynamics in the device and the degree of internal photoemission at the metal-semiconductor interfaces. We experimentally study the behavior of dedicated field-effect (FE-)PIPED test structures and develop a physical understanding of the underlying principles. We find that the THz down-conversion efficiency of FE-PIPED can be significantly increased when applying a gate potential. Building upon the improved understanding of the device physics, we further perform simulations and show that the gate field increases the carrier density in the conductive channel below the gate oxide to the extent that the device dynamics are determined by ultra-fast dielectric relaxation rather than by the carrier transit time. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000134492
Veröffentlicht am 26.08.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Institut für Photonik und Quantenelektronik (IPQ)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2021
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000134492
HGF-Programm 43.32.03 (POF IV, LK 01) Designed Optical Devices & Systems
Erschienen in Optics express
Verlag Optica Publishing Group (OSA)
Band 29
Heft 14
Seiten 21586-21602
Vorab online veröffentlicht am 24.06.2021
Schlagwörter Proposal 2021-009-001049: DRIE, EBL
Nachgewiesen in Web of Science
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