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

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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 languageAmerican English
Pages (from-to)2011-2013
Number of pages3
JournalApplied Physics Letters
Issue number14
StatePublished - 6 Oct 1997


Dive into the research topics of 'Low-power photocurrent nonlinearity in quantum well infrared detectors'. Together they form a unique fingerprint.

Cite this