Photonics Research, Volume. 3, Issue 1, 1(2015)

Near-infrared metal-semiconductor-metal photodetector based on semi-insulating GaAs and interdigital electrodes

A. I. Nusir1、*, A. M. Hil2, M. O. Manasreh1, and and J. B. Herzog2
Author Affiliations
  • 1Electrical Engineering Department, University of Arkansas, Fayetteville, Arkansas 72701, USA
  • 2Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
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    Figures & Tables(4)
    (a) Schematic of device showing two electrodes (gold) with channels between the interdigital fingers (black). Diagram also shows transverse, ET, and longitudinal, EL, polarizations, as well as the polarization angle, θ; (b) cross section of device showing Au electrodes with thickness, w, and spacing, d, attached to the semi-insulating GaAs substrate with the Ti layer.
    (a) I–V characteristics of device with 5 μm electrode spacing under illumination intensity of 100 mW/cm2; (b) detectivity of the device with 5 μm electrode spacing.
    (a) Spectral response spectra for transverse polarization as function of electrode spacing, d; (b) normalized peak from (a) plotted as function of electrode spacing; (c) normalized calculated photocurrent as a function of electrode spacing at 875 nm incident light.
    (a) Measured spectral response of a 5 μm device for transverse and longitudinal polarization; (b) calculated optical enhancement near the electrode edge for transverse polarization; (c) calculated optical enhancement near the electrode edge for longitudinal polarization; (d) polarization-dependent normalized spectral response measurements (squares) and normalized photocurrent calculations (circles) with a A cos2 θ+B fit (line).
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    A. I. Nusir, A. M. Hil, M. O. Manasreh, and J. B. Herzog. Near-infrared metal-semiconductor-metal photodetector based on semi-insulating GaAs and interdigital electrodes[J]. Photonics Research, 2015, 3(1): 1

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    Paper Information

    Category: Photodetectors

    Received: Nov. 19, 2014

    Accepted: Nov. 24, 2014

    Published Online: Apr. 15, 2015

    The Author Email: A. I. Nusir (ainusir@email.uark.edu)

    DOI:10.1364/PRJ.3.000001

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