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Metamaterial Devices for Enhancement of Thermophotovoltaics and Mid-IR Detectors.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Metamaterial Devices for Enhancement of Thermophotovoltaics and Mid-IR Detectors./
Author:	Pfiester Latham, Nicole A.
Description:	1 online resource (303 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
Subject:	Electrical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781392008225

Metamaterial Devices for Enhancement of Thermophotovoltaics and Mid-IR Detectors.
Pfiester Latham, Nicole A.

Metamaterial Devices for Enhancement of Thermophotovoltaics and Mid-IR Detectors. - 1 online resource (303 pages)

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--Tufts University, 2019.

Includes bibliographical references

The performance of modern optoelectronic devices is improved if their optical properties can be finely engineered for the application at hand. Unfortunately, constraints such as lattice matching, dopant incorporation, and other manufacturing considerations limit what can be done in the device itself. Manipulating the light before it hits the device can overcome some of these design limitations. For example, applying a selective emitter to a photovoltaic system can increase the conversion efficiency by better tailoring the incident spectrum to the cell's band gap energy. Likewise, in place of dedicated pixels, a device-wide filter that can change dynamically would increase photodetector polarization resolution. Metamaterials, a class of man-made materials whose properties can be designed, are well suited to solve these problems. My research focuses on applying metamaterial devices to two applications: thermophotovoltaics (TPV) and photodetectors. TPV systems are particularly vulnerable to parasitic losses that decrease conversion efficiency due to their narrow band gap, making them prime candidates for pairing with selective emitters. However, the energy sources they use, ranging from the radioisotope heat source in deep space probes to the waste heat from industrial processes, often operate at very high temperatures. In this dissertation, I will present the first selective emitter made from the refractory metal iridium so that it can withstand temperatures above 1000 °C. Its performance will be compared to my previous work in platinum-based selective emitters. Managing polarized light is often a consideration in photodetection applications. Metamaterial devices can be engineered to have polarization-dependent responses through the nanostructure shape, but the response can be enhanced or otherwise changed based on the dielectric layer underneath the metallic nanostructures. The work presented in this dissertation has explored the interaction with polarized light on two fronts. In the first, I show that a selective absorber design previously shown to be angle-of-incidence independent can exhibit enhanced reflection only at glancing angles if the dielectric layer is changed. In the second, I created a mid-infrared polarizing filter that uses a semiconductor thin film to enable use of a bias voltage. The bias voltage changes the metamaterial response, making the device dynamically tunable.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9781392008225Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

Active metamaterialIndex Terms--Genre/Form:

554714
Electronic books.

Metamaterial Devices for Enhancement of Thermophotovoltaics and Mid-IR Detectors.
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520 $a The performance of modern optoelectronic devices is improved if their optical properties can be finely engineered for the application at hand. Unfortunately, constraints such as lattice matching, dopant incorporation, and other manufacturing considerations limit what can be done in the device itself. Manipulating the light before it hits the device can overcome some of these design limitations. For example, applying a selective emitter to a photovoltaic system can increase the conversion efficiency by better tailoring the incident spectrum to the cell's band gap energy. Likewise, in place of dedicated pixels, a device-wide filter that can change dynamically would increase photodetector polarization resolution. Metamaterials, a class of man-made materials whose properties can be designed, are well suited to solve these problems. My research focuses on applying metamaterial devices to two applications: thermophotovoltaics (TPV) and photodetectors. TPV systems are particularly vulnerable to parasitic losses that decrease conversion efficiency due to their narrow band gap, making them prime candidates for pairing with selective emitters. However, the energy sources they use, ranging from the radioisotope heat source in deep space probes to the waste heat from industrial processes, often operate at very high temperatures. In this dissertation, I will present the first selective emitter made from the refractory metal iridium so that it can withstand temperatures above 1000 °C. Its performance will be compared to my previous work in platinum-based selective emitters. Managing polarized light is often a consideration in photodetection applications. Metamaterial devices can be engineered to have polarization-dependent responses through the nanostructure shape, but the response can be enhanced or otherwise changed based on the dielectric layer underneath the metallic nanostructures. The work presented in this dissertation has explored the interaction with polarized light on two fronts. In the first, I show that a selective absorber design previously shown to be angle-of-incidence independent can exhibit enhanced reflection only at glancing angles if the dielectric layer is changed. In the second, I created a mid-infrared polarizing filter that uses a semiconductor thin film to enable use of a bias voltage. The bias voltage changes the metamaterial response, making the device dynamically tunable.
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