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Antenna-coupled unbiased detectors for LW-IR regime.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Antenna-coupled unbiased detectors for LW-IR regime./
Author:	Tiwari, Badri Nath.
Description:	209 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .
Contained By:	Dissertation Abstracts International73-06B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3496602
ISBN:	9781267161871

Antenna-coupled unbiased detectors for LW-IR regime.
Tiwari, Badri Nath.

Antenna-coupled unbiased detectors for LW-IR regime. - 209 p.

Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .

Thesis (Ph.D.)--University of Notre Dame, 2011.

At room temperature (300K), the electromagnetic (EM) radiation emitted by humans and other living beings peaks mostly in the long-wavelength infrared (LW-IR) regime. And since the atmosphere shows relatively little absorption in this band, applications such as target detection, tracking, active homing, and navigation in autonomous vehicles extensively use the LW-IR frequency range. The present research work is focused on developing antenna-based, uncooled, and unbiased detectors for the LW-IR regime.

ISBN: 9781267161871Subjects--Topical Terms:

845382
Engineering, Electronics and Electrical.

Antenna-coupled unbiased detectors for LW-IR regime.
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100 1 $a Tiwari, Badri Nath. $3 845538
245 1 0 $a Antenna-coupled unbiased detectors for LW-IR regime.
300 $a 209 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .
500 $a Adviser: Wolfgang Porod.
502 $a Thesis (Ph.D.)--University of Notre Dame, 2011.
520 $a At room temperature (300K), the electromagnetic (EM) radiation emitted by humans and other living beings peaks mostly in the long-wavelength infrared (LW-IR) regime. And since the atmosphere shows relatively little absorption in this band, applications such as target detection, tracking, active homing, and navigation in autonomous vehicles extensively use the LW-IR frequency range. The present research work is focused on developing antenna-based, uncooled, and unbiased detectors for the LW-IR regime.
520 $a In the first part of this research, antenna-coupled metal-oxide-metal diodes (ACMOMD) are investigated. In response to the EM radiation, high-frequency antenna currents are induced in the antenna. An asymmetric-barrier Al-Al2O3-Pt MOM diode rectifies the antenna currents. Two different types of fabrication processes have been developed for ACMOMDs namely one-step lithography and two-step lithography. The major drawbacks of MOM-based devices include hard-to-control fabrication processes, generally very high zero-biased resistances, and vulnerability to electrostatic discharges, leading to unstable electrical characteristics.
520 $a The second part of this research focuses on the development of unbiased LW-IR sensors based on the Seebeck effect. If two different metals are joined together at one end and their other ends are open-circuited, and if a non-zero temperature difference exists between the joined end and the open ends, then a non-zero open-circuit voltage can be measured between the open ends of the wires. Based on this effect, we have developed antenna-coupled nano-thermocouples (ACNTs) in which radiation-induced antenna currents produce polarization-dependent heating of the joined end of the two metals whereas the open ends remain at substrate temperature. This polarization-dependent heating induces polarization-dependent temperature difference between the joined end and the open ends of the metals leading to a polarization-dependent open-circuit voltage between the open ends of the metals. A CW CO2 laser tuned at 10.6 mum wavelength has been used for infrared characterization of these sensors. For these sensors, average responsivity of 22.7 mV/W, signal-to-noise (SNR) ratio of 29 dB, noise equivalent power (NEP) of 1.55 nW, and specific detectivity (D*) of 1.77x105 cm. Hz .W--1 were measured. ACNTs are expected to operate at frequencies much beyond 400 KHz.
520 $a The third part of this research focuses on the effect of DC read-out interconnects on polarization characteristics of the planar dipole antennas. Different geometries of the interconnects present different electromagnetic boundary conditions to the antenna, and thus affect the far-field polarization characteristics of the antenna. Four designs of DC read-out interconnects are fabricated and their polarization-dependent IR responses are experimentally measured. The High Frequency Structure Simulator (HFSS) from ANSYS is used to simulate the polarization characteristics of the antenna with different read-out geometries.
590 $a School code: 0165.
650 4 $a Engineering, Electronics and Electrical. $3 845382
650 4 $a Nanotechnology. $3 557660
690 $a 0544
690 $a 0652
710 2 $a University of Notre Dame. $3 845534
773 0 $t Dissertation Abstracts International $g 73-06B.
790 1 0 $a Porod, Wolfgang, $e advisor
790 $a 0165
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3496602