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High Absorption Per Unit Thermal Mas...

Das, Avijit.

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High Absorption Per Unit Thermal Mass Subwavelength Perforated Membrane as Uncooled Thermal Infrared Detector.

Record Type:	Electronic resources : Monograph/item
Title/Author:	High Absorption Per Unit Thermal Mass Subwavelength Perforated Membrane as Uncooled Thermal Infrared Detector./
Author:	Das, Avijit.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	151 p.
Notes:	Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
Contained By:	Dissertations Abstracts International84-09B.
Subject:	Electrical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30248652
ISBN:	9798377600541

High Absorption Per Unit Thermal Mass Subwavelength Perforated Membrane as Uncooled Thermal Infrared Detector.
Das, Avijit.

High Absorption Per Unit Thermal Mass Subwavelength Perforated Membrane as Uncooled Thermal Infrared Detector. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 151 p.

Source: Dissertations Abstracts International, Volume: 84-09, Section: B.

Thesis (Ph.D.)--University of Minnesota, 2023.

This item must not be sold to any third party vendors.

In the first project, a theoretical and experimental investigation of photon di{candra}{Ohorn}{80}usion is discussed in highly absorbing microscale graphite. A Nd:YAG continuous wave laser is used to heat the graphite samples with thicknesses of 40 {phono}{aelig}m and 100 {phono}{aelig}m. Optical intensities of {A0}10 kW cm{acute}{88}{92}2 and 20 kW cm{acute}{88}{92}2 are used in laser heating. The graphite samples are heated to temperatures of thousands of kelvins within milliseconds, which are recorded by a 2-color, high-speed pyrometer. To compare the observed temperatures, the di{candra}{Ohorn}{80}erential equation of heat conduction is solved across the samples with proper initial and boundary conditions. In addition to lattice vibrations, photon di{candra}{Ohorn}{80}usion is incorporated into the analytical model of thermal conductivity for solving the heat equation. The numerical simulations showed close matching between experiment and theory only when including the photon di{candra}{Ohorn}{80}usion equations and existing material properties data found in the previously published works with no fitting constants. The results indicate that the commonly overlooked mechanism of photon di{candra}{Ohorn}{80}usion dominates the heat transfer of many microscale structures near their evaporation temperatures. In addition, the treatment explains the discrepancies between thermal conductivity measurements and theory that were previously described in the scientifc literature.In the second project, a subwavelength perforated metamaterial absorber is developed for a maximum absorption-to-thermal mass ratio to construct an uncooled thermal infrared ({CE}{BB}{acute}{88}{ohorn}8{acute}{88}{92}12 {phono}{aelig}m) detector operating at a time constant of {acute}{88}{ohorn}7.7 ms, faster than the video frame rates, with a noise equivalent temperature di{candra}{Ohorn}{80}erence (NETD) of 4.5 mKand a detectivity of 3.8x109cm{acute}{88}{9A}Hz/W. The designed metamaterial absorber consists of Ti, SiNx, and Ni nanoscale films with an overall fill factor of {acute}{88}{ohorn}28%, where subwavelength interference and Fabry Perot resonance induce an absorption per unit mass of approximately 1.3{acute}{88}{92}27.6 times higher than the previously reported infrared absorbers. We read out the fabricated detector optically via Mach Zehnder interferometer.

ISBN: 9798377600541Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

Absorption per unit mass

High Absorption Per Unit Thermal Mass Subwavelength Perforated Membrane as Uncooled Thermal Infrared Detector.
LDR:03840nmm a2200457 4500 001 2395624
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020 $a 9798377600541
035 $a (MiAaPQ)AAI30248652
035 $a AAI30248652
040 $a MiAaPQ $c MiAaPQ
100 1 $a Das, Avijit. $3 3765134
245 1 0 $a High Absorption Per Unit Thermal Mass Subwavelength Perforated Membrane as Uncooled Thermal Infrared Detector.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 151 p.
500 $a Source: Dissertations Abstracts International, Volume: 84-09, Section: B.
500 $a Advisor: Talghader, Joseph J.
502 $a Thesis (Ph.D.)--University of Minnesota, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a In the first project, a theoretical and experimental investigation of photon di{candra}{Ohorn}{80}usion is discussed in highly absorbing microscale graphite. A Nd:YAG continuous wave laser is used to heat the graphite samples with thicknesses of 40 {phono}{aelig}m and 100 {phono}{aelig}m. Optical intensities of {A0}10 kW cm{acute}{88}{92}2 and 20 kW cm{acute}{88}{92}2 are used in laser heating. The graphite samples are heated to temperatures of thousands of kelvins within milliseconds, which are recorded by a 2-color, high-speed pyrometer. To compare the observed temperatures, the di{candra}{Ohorn}{80}erential equation of heat conduction is solved across the samples with proper initial and boundary conditions. In addition to lattice vibrations, photon di{candra}{Ohorn}{80}usion is incorporated into the analytical model of thermal conductivity for solving the heat equation. The numerical simulations showed close matching between experiment and theory only when including the photon di{candra}{Ohorn}{80}usion equations and existing material properties data found in the previously published works with no fitting constants. The results indicate that the commonly overlooked mechanism of photon di{candra}{Ohorn}{80}usion dominates the heat transfer of many microscale structures near their evaporation temperatures. In addition, the treatment explains the discrepancies between thermal conductivity measurements and theory that were previously described in the scientifc literature.In the second project, a subwavelength perforated metamaterial absorber is developed for a maximum absorption-to-thermal mass ratio to construct an uncooled thermal infrared ({CE}{BB}{acute}{88}{ohorn}8{acute}{88}{92}12 {phono}{aelig}m) detector operating at a time constant of {acute}{88}{ohorn}7.7 ms, faster than the video frame rates, with a noise equivalent temperature di{candra}{Ohorn}{80}erence (NETD) of 4.5 mKand a detectivity of 3.8x109cm{acute}{88}{9A}Hz/W. The designed metamaterial absorber consists of Ti, SiNx, and Ni nanoscale films with an overall fill factor of {acute}{88}{ohorn}28%, where subwavelength interference and Fabry Perot resonance induce an absorption per unit mass of approximately 1.3{acute}{88}{92}27.6 times higher than the previously reported infrared absorbers. We read out the fabricated detector optically via Mach Zehnder interferometer.
590 $a School code: 0130.
650 4 $a Electrical engineering. $3 649834
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Remote sensing. $3 535394
653 $a Absorption per unit mass
653 $a Detectivity
653 $a Effective medium
653 $a Noise equivalent temperature difference
653 $a Perforated metamaterial
653 $a Uncooled thermal detector
653 $a Thermal mass
653 $a Perforated membrane
653 $a Infrared detector
653 $a High absorption
690 $a 0544
690 $a 0611
690 $a 0799
710 2 $a University of Minnesota. $b Electrical/Computer Engineering. $3 1672573
773 0 $t Dissertations Abstracts International $g 84-09B.
790 $a 0130
791 $a Ph.D.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30248652