Photocurrent noise in QWIPs: signatures of nonuniform potential distribution over periods

Anna Carbone; H.C. Liu

doi:10.1117/12.497040

16 May 2003 Photocurrent noise in QWIPs: signatures of nonuniform potential distribution over periods

Anna Carbone, H.C. Liu

Proceedings Volume 5111, Fluctuations and Noise in Photonics and Quantum Optics; (2003) https://doi.org/10.1117/12.497040
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

Abstract

The photocurrent noise has been investigated in Quantum Well Infrared Photodetectors (QWIPs) having identical growth sequence, layer width and composition, but different number of wells. It has been found that the power spectral density exhibits characteristic features related to the discrete structure of the device. This behavior might be caused by the strong potential nonuniformity arising as a consequence of the imbalance between the current injected at the emitter and the stream of photoelectrons drifting through the structure, which is also responsible for the anomalies in the steady-state and transient photoconductivity. In the present work, we will add further evidence to our preliminary study by presenting results of the power spectral density obtained by numerical solution of the continuity equation of the electrons in the continuum state, with a discrete distribution of the electric field in the active region, instead of the homogeneous one valid for conventional photodetectors.

Citation Download Citation

Anna Carbone and H.C. Liu "Photocurrent noise in QWIPs: signatures of nonuniform potential distribution over periods", Proc. SPIE 5111, Fluctuations and Noise in Photonics and Quantum Optics, (16 May 2003); https://doi.org/10.1117/12.497040

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