http://engr.rice.edu/eventslist.aspx?EventRecord=23283
September 11, 2014
4:00 PM - 5:00 PM
Seminar
Speaker:
Jon Suen
Jon Suen
| From: | UC - Santa Barbara |
Location:
300
Brockman Hall for Physics
300
Brockman Hall for Physics
Abstract:
Title: Design and Characterization of Terahertz Biomedical Imaging and Communication Systems Abstract: The terahertz (THz) band, from 300 GHz to 20 THz, is the last remaining frontier of the electromagnetic spectrum. There is a rich set of phenomenology, science, and applications, which are only available with THz radiation. The THz engineer must be adept at integrating components with very limited performance into a system. This requires understanding and knowledge of a wide range of fields, including microwaves, infrared optics, material science, software development, atmospheric science, and the overall analysis and design of a system. First, I discuss the development of a broadband, reflective THz imaging system for biomedical applications. Critical to this application is the phenomenological characterization of the system, and I describe studies showing that water concentration is the primary contrast mechanism for this modality. For source technology, I detail the development and characterization of photoconductive switches with record-breaking optical conversion efficiency. I developed a model which explains the photocarrier dynamics in fast-trapping THz photoconductive materials and show that THz generation >1 THz is caused mainly by carrier generation. Finally, in the field of THz propagation, I have located low atmospheric water vapor sites and characterized THz attenuation on a global scale with satellite remote sensing data. I show the analysis of a full system by showing the ability for the THz bands to support terabit per second ground to geostationary satellite links to moderately dry locations. These projects inherently involved multidisciplinary research though they all were targeted towards the THz regime. It exemplifies the broad knowledge and diverse fields that must be synergized to build effective THz systems and advance science in the THz domain.
Title: Design and Characterization of Terahertz Biomedical Imaging and Communication Systems Abstract: The terahertz (THz) band, from 300 GHz to 20 THz, is the last remaining frontier of the electromagnetic spectrum. There is a rich set of phenomenology, science, and applications, which are only available with THz radiation. The THz engineer must be adept at integrating components with very limited performance into a system. This requires understanding and knowledge of a wide range of fields, including microwaves, infrared optics, material science, software development, atmospheric science, and the overall analysis and design of a system. First, I discuss the development of a broadband, reflective THz imaging system for biomedical applications. Critical to this application is the phenomenological characterization of the system, and I describe studies showing that water concentration is the primary contrast mechanism for this modality. For source technology, I detail the development and characterization of photoconductive switches with record-breaking optical conversion efficiency. I developed a model which explains the photocarrier dynamics in fast-trapping THz photoconductive materials and show that THz generation >1 THz is caused mainly by carrier generation. Finally, in the field of THz propagation, I have located low atmospheric water vapor sites and characterized THz attenuation on a global scale with satellite remote sensing data. I show the analysis of a full system by showing the ability for the THz bands to support terabit per second ground to geostationary satellite links to moderately dry locations. These projects inherently involved multidisciplinary research though they all were targeted towards the THz regime. It exemplifies the broad knowledge and diverse fields that must be synergized to build effective THz systems and advance science in the THz domain.
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