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Proceedings Paper

New tunnel diode for zero-bias direct detection for millimeter-wave imagers
Author(s): Edward T. Croke; Joel N. Schulman; David H. Chow; Howard L. Dunlap; Kevin S. Holabird; Leslie D. Warren; Matthew A. Morgan; Sander Weinreb
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Paper Abstract

High-resolution passive millimeter wave imaging cameras require per pixel detector circuitry that is simple, has high sensitivity, low noise, and low power. Detector diodes that do not require bias or local oscillator input, and have high cutoff frequencies are strongly preferred. In addition, they must be manufacturable in large quantities with reasonable uniformity and reproducibility. Such diodes have not been obtainable for W-band and above. We are developing zero-bias square-law detector diodes based on InAs/Alsb/GaAlSb heterostructures which for the first time offer a cost-effective solution for large array formats. The diodes have a high frequency response and are relatively insensitive to growth and process variables. The large zero- bias non-linearity in current floor necessary for detection arises from interband tunneling between the InAs and the GaAlSb layers. Video resistance can be controlled by varying an Alsb tunnel barrier layer thickness. Our analysis shows that capacitance can be further decreased and sensitivity increased by shrinking the diode area, as the diode can have very high current density. DC and RF characterization of these devices and an estimate of their ultimate frequency performance in comparison with commercially available diodes are presented.

Paper Details

Date Published: 21 August 2001
PDF: 6 pages
Proc. SPIE 4373, Passive Millimeter-Wave Imaging Technology V, (21 August 2001); doi: 10.1117/12.438136
Show Author Affiliations
Edward T. Croke, HRL Labs. LLC (United States)
Joel N. Schulman, HRL Labs. LLC (United States)
David H. Chow, HRL Labs. LLC (United States)
Howard L. Dunlap, HRL Labs. LLC (United States)
Kevin S. Holabird, HRL Labs. LLC (United States)
Leslie D. Warren, HRL Labs. LLC (United States)
Matthew A. Morgan, California Institute of Technology (United States)
Sander Weinreb, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 4373:
Passive Millimeter-Wave Imaging Technology V
Roger M. Smith; Roger Appleby, Editor(s)

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