ETD

Archivio digitale delle tesi discusse presso l'Università di Pisa

Tesi etd-09222016-100347


Tipo di tesi
Tesi di laurea magistrale
Autore
DARDANIS, ENRICO
URN
etd-09222016-100347
Titolo
Terahertz photodetector architectures based on thin flakes of black-phosphorus: design, fabrication and study of the transport, optical and near field properties
Dipartimento
FISICA
Corso di studi
FISICA
Relatori
relatore Dott.ssa Vitiello, Miriam Serena
Parole chiave
  • SNOM
  • photodetector
  • black phosphorus
  • 2D materials
  • Terahertz
Data inizio appello
17/10/2016
Consultabilità
Non consultabile
Data di rilascio
17/10/2086
Riassunto
The present thesis is focused on the study of the interaction between terahertz (THz) radiation, (frequency 0.1-10 THz), and thin flakes of the two dimensional semiconductor black phosphorus (BP). BP based photodetectors were designed, nanofabricated and characterized electrically and optically.
The realized devices are field effect transistors operating as nano-detectors, able to detect the 3.4 THz radiation of a quantum cascade laser (QCL), and operate at room temperature with responsivities of the order of 1 V/W and state of the art noise equivalent powers.
Two different architectures have been investigated, namely a ’far field’ architecture, where THz radiation impinges onto the detector from the free space; and a ’near field architecture’, where evanescent THz radiation transmitted through a sub-wavelength size aperture is detected by the on-chip detector.
Sensitive detection of the 3.4 THz QCL radiation is demonstrated in both the configurations. A first imaging application of the near field architecture is provided, where Fabry-Perot induced fringes in the QCL beam are detected.
The final part of this work is dedicated to the physics and preliminary realization of a THz near field setup which will be used for future studies on 2D materials and 2D materials based THz detectors.
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