Analysis of surface plasmon polariton enhancement in photodetection by Al-GaAs Schottky diodes

I. R. Tamm, P. Dawson, A. Sellai, M. A. Pate, R. Grey, G. Hill

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The surface plasmon polariton mediated photoresponse from Al-GaAs diodes is examined in a prism-air gap-diode configuration as a function of both the wavelength of the incident light and thickness of the Al electrode. The experimental data shows a pronounced dip in reflectance as a function of internal angle of incidence in the prism, due to the excitation of the surface plasmon polariton at the Al-air interface, and a corresponding peak in device photosignal. Careful modelling of reflectance and quantum efficiency data shows that the bulk of the signal is generated by light which is re-radiated from this surface mode into the semiconductor substrate where it is absorbed by the creation of electron-hole pairs in the depletion region. This holds for all the wavelengths used here (all are shorter than the GaAs absorption edge) and across the thickness range of the Al electrodes (20-50 nm). Quantum efficiencies in the range 0.5-22% and enhancement factors of typically 7.5 were recorded in this investigation.

Original languageEnglish
Pages (from-to)1417-1427
Number of pages11
JournalSolid State Electronics
Volume36
Issue number10
DOIs
Publication statusPublished - 1993

Fingerprint

Schottky diodes
polaritons
Diodes
Prisms
Quantum efficiency
prisms
augmentation
quantum efficiency
diodes
reflectance
Wavelength
Electrodes
electrodes
air
Air
wavelengths
depletion
incidence
Semiconductor materials
Electrons

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Analysis of surface plasmon polariton enhancement in photodetection by Al-GaAs Schottky diodes. / Tamm, I. R.; Dawson, P.; Sellai, A.; Pate, M. A.; Grey, R.; Hill, G.

In: Solid State Electronics, Vol. 36, No. 10, 1993, p. 1417-1427.

Research output: Contribution to journalArticle

Tamm, I. R. ; Dawson, P. ; Sellai, A. ; Pate, M. A. ; Grey, R. ; Hill, G. / Analysis of surface plasmon polariton enhancement in photodetection by Al-GaAs Schottky diodes. In: Solid State Electronics. 1993 ; Vol. 36, No. 10. pp. 1417-1427.
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AU - Grey, R.

AU - Hill, G.

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