Low-power photocurrent nonlinearity in quantum well infrared detectors

C. Mermelstein; H. Schneider; A. Sa'ar; C. Schönbein; M. Walther; G. Bihlmann

doi:10.1063/1.119771

Low-power photocurrent nonlinearity in quantum well infrared detectors

C. Mermelstein^*
, H. Schneider
, A. Sa'ar
, C. Schönbein
, M. Walther
, G. Bihlmann

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

We report on the intensity dependence of the responsivity in quantum well infrared photodetectors (QWIP). A strong reduction of the responsivity is observed already at small excitation powers for a QWIP with N=4 periods. This nonlinearity is caused by a partial screening of the electric field across the main part of the active region. The intensity dependence is analyzed using a phenomenological approach, which allows us to calculate the nonlinearity from the measured dark current and responsivity. Applying this approach to a background-limited 50 period QWIP, we find that the nonlinearity is already present below 1 mW cm^-2, which is less than the thermal background.

Original language	English
Pages (from-to)	2011-2013
Number of pages	3
Journal	Applied Physics Letters
Volume	71
Issue number	14
DOIs	https://doi.org/10.1063/1.119771
State	Published - 6 Oct 1997

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abstract = "We report on the intensity dependence of the responsivity in quantum well infrared photodetectors (QWIP). A strong reduction of the responsivity is observed already at small excitation powers for a QWIP with N=4 periods. This nonlinearity is caused by a partial screening of the electric field across the main part of the active region. The intensity dependence is analyzed using a phenomenological approach, which allows us to calculate the nonlinearity from the measured dark current and responsivity. Applying this approach to a background-limited 50 period QWIP, we find that the nonlinearity is already present below 1 mW cm-2, which is less than the thermal background.",

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AU - Mermelstein, C.

AU - Schneider, H.

AU - Sa'ar, A.

AU - Schönbein, C.

AU - Walther, M.

AU - Bihlmann, G.

PY - 1997/10/6

Y1 - 1997/10/6

N2 - We report on the intensity dependence of the responsivity in quantum well infrared photodetectors (QWIP). A strong reduction of the responsivity is observed already at small excitation powers for a QWIP with N=4 periods. This nonlinearity is caused by a partial screening of the electric field across the main part of the active region. The intensity dependence is analyzed using a phenomenological approach, which allows us to calculate the nonlinearity from the measured dark current and responsivity. Applying this approach to a background-limited 50 period QWIP, we find that the nonlinearity is already present below 1 mW cm-2, which is less than the thermal background.

AB - We report on the intensity dependence of the responsivity in quantum well infrared photodetectors (QWIP). A strong reduction of the responsivity is observed already at small excitation powers for a QWIP with N=4 periods. This nonlinearity is caused by a partial screening of the electric field across the main part of the active region. The intensity dependence is analyzed using a phenomenological approach, which allows us to calculate the nonlinearity from the measured dark current and responsivity. Applying this approach to a background-limited 50 period QWIP, we find that the nonlinearity is already present below 1 mW cm-2, which is less than the thermal background.

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JF - Applied Physics Letters

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Low-power photocurrent nonlinearity in quantum well infrared detectors

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