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Generation and Detection of Pulsed T...

Buccheri, Fabrizio.

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Generation and Detection of Pulsed Terahertz Waves with Laser Induced Microplasmas.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Generation and Detection of Pulsed Terahertz Waves with Laser Induced Microplasmas./
作者:	Buccheri, Fabrizio.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	141 p.
附註:	Source: Dissertations Abstracts International, Volume: 78-07, Section: B.
Contained By:	Dissertations Abstracts International78-07B.
標題:	Optics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10245453
ISBN:	9781369463026

Generation and Detection of Pulsed Terahertz Waves with Laser Induced Microplasmas.
Buccheri, Fabrizio.

Generation and Detection of Pulsed Terahertz Waves with Laser Induced Microplasmas. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 141 p.

Source: Dissertations Abstracts International, Volume: 78-07, Section: B.

Thesis (Ph.D.)--University of Rochester, 2016.

This item is not available from ProQuest Dissertations & Theses.

The past two decades have seen an exponential growth of interest in one of the least explored region of the electromagnetic spectrum, the terahertz frequency band, ranging from to 0.1 to 10 THz. Once only the realm of astrophysicists studying the background radiation of the universe, terahertz waves have become little by little relevant in the most diverse fields, such as medical imaging, industrial inspection, remote sensing, fundamental science, and so on. This is due to the unique interaction between matter and electromagnetic waves oscillating at terahertz frequencies, allowing the latter to pass through many materials that are opaque at optical frequencies, including bags, clothing, wood, most plastics and yet be able to uniquely identify many chemical compounds, such as drugs (licit and illicit), explosives, biological samples etc... Remarkably, terahertz wave radiation can be generated and detected by using ambient air as the source and the sensor. This is accomplished by creating plasma under the illumination of intense femtosecond laser fields. The integration of such a plasma source and sensor in terahertz time-domain techniques allows spectral measurements covering the whole terahertz gap (0.1 to 10 THz), further increasing the impact of this scientific tool in the study of the four states of matter. In this manuscript the author introduces a new paradigm for implementing terahertz plasma techniques. Specifically, he replaced the use of elongated plasmas, ranging from few mm to several cm, with sub-mm plasmas, which will be referred to as microplasmas, obtained by focusing ultrafast laser pulses with high numerical aperture optics (NA from 0.1 to 0.9). Those microplasmas have in fact unique properties compared to any other THz source and sensor, with the potential of enabling new and exciting applications. Specifically, they require orders of magnitude less laser pulse energy to be created, enabling plasma-based terahertz technique to be implemented with low energy ultrafast lasers. Moreover, they offer a generation, or detection, volume with sub-wavelength size (1 THz = 300 μm), which could be exploited to implement near field THz plasma techniques. This dissertation presents the experimental study of the terahertz emission and detection from laser-induced plasmas of submillimeter size. Regarding the microplasma source, one of the interesting phenomena is that the main direction of terahertz wave emission is almost orthogonal to the laser propagation direction, unlike that of elongated plasmas. Perhaps the most important achievement is the demonstration that laser pulse energies lower than 1 μJ are sufficient to generate measurable terahertz pulses from ambient air, thus reducing the required laser energy requirement of two orders of magnitude compared to the state of art. This significant decrease in the required laser energy will make plasma-based terahertz techniques more accessible to the scientific community, as well as opening new potential industrial applications. Finally, experimental observations of terahertz radiation detection with microplasmas are also presented. As fully coherent detection was not achieved in this work, the results presented herein are to be considered a first step to understand the peculiarities involved in using the microplasma as a terahertz sensor.

ISBN: 9781369463026Subjects--Topical Terms:

517925
Optics.

Generation and Detection of Pulsed Terahertz Waves with Laser Induced Microplasmas.
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520 $a The past two decades have seen an exponential growth of interest in one of the least explored region of the electromagnetic spectrum, the terahertz frequency band, ranging from to 0.1 to 10 THz. Once only the realm of astrophysicists studying the background radiation of the universe, terahertz waves have become little by little relevant in the most diverse fields, such as medical imaging, industrial inspection, remote sensing, fundamental science, and so on. This is due to the unique interaction between matter and electromagnetic waves oscillating at terahertz frequencies, allowing the latter to pass through many materials that are opaque at optical frequencies, including bags, clothing, wood, most plastics and yet be able to uniquely identify many chemical compounds, such as drugs (licit and illicit), explosives, biological samples etc... Remarkably, terahertz wave radiation can be generated and detected by using ambient air as the source and the sensor. This is accomplished by creating plasma under the illumination of intense femtosecond laser fields. The integration of such a plasma source and sensor in terahertz time-domain techniques allows spectral measurements covering the whole terahertz gap (0.1 to 10 THz), further increasing the impact of this scientific tool in the study of the four states of matter. In this manuscript the author introduces a new paradigm for implementing terahertz plasma techniques. Specifically, he replaced the use of elongated plasmas, ranging from few mm to several cm, with sub-mm plasmas, which will be referred to as microplasmas, obtained by focusing ultrafast laser pulses with high numerical aperture optics (NA from 0.1 to 0.9). Those microplasmas have in fact unique properties compared to any other THz source and sensor, with the potential of enabling new and exciting applications. Specifically, they require orders of magnitude less laser pulse energy to be created, enabling plasma-based terahertz technique to be implemented with low energy ultrafast lasers. Moreover, they offer a generation, or detection, volume with sub-wavelength size (1 THz = 300 μm), which could be exploited to implement near field THz plasma techniques. This dissertation presents the experimental study of the terahertz emission and detection from laser-induced plasmas of submillimeter size. Regarding the microplasma source, one of the interesting phenomena is that the main direction of terahertz wave emission is almost orthogonal to the laser propagation direction, unlike that of elongated plasmas. Perhaps the most important achievement is the demonstration that laser pulse energies lower than 1 μJ are sufficient to generate measurable terahertz pulses from ambient air, thus reducing the required laser energy requirement of two orders of magnitude compared to the state of art. This significant decrease in the required laser energy will make plasma-based terahertz techniques more accessible to the scientific community, as well as opening new potential industrial applications. Finally, experimental observations of terahertz radiation detection with microplasmas are also presented. As fully coherent detection was not achieved in this work, the results presented herein are to be considered a first step to understand the peculiarities involved in using the microplasma as a terahertz sensor.
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