Title

Detection Mechanisms In Microstrip Dipole Antenna-Coupled Infrared Detectors

Keywords

Infrared antenna; IR detector; Microbolometer; Microstrip dipole; MIM diode

Abstract

We compare the detection mechanisms employed in microstrip dipole antenna-coupled infrared detectors. The electrical currents induced along the antenna arms are detected by a rectangular niobium (Nb) microsensor placed at the center of the antenna. The ohmic nature of the Au-Nb contact determines the detection mechanism. Devices with linear contacts between the Au antenna arms and the Nb microsensor exhibit bolometric response. A nonlinear Au-insulator-Nb junction rectifies the induced antenna currents. Devices with nonlinear contacts also exhibit a bolometric response. The devices with nonlinear contacts are 1/f noise limited while the devices with linear contacts are Johnson noise limited. The rectification mechanism is 5.3 times faster than the thermal detection. The current-voltage (I-V) characteristic of the devices exhibiting bolometric response is linear, while that of the rectifying devices is cubic. For devices with nonlinear contacts excellent agreement is obtained between the measured detector response and the ratio between the second and the first derivative of the I-V characteristic. © 2003 Elsevier Science B.V. All rights reserved.

Publication Date

6-1-2003

Publication Title

Infrared Physics and Technology

Volume

44

Issue

3

Number of Pages

155-163

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/S1350-4495(02)00224-4

Socpus ID

0037544314 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0037544314

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