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You searched for subject:(Cadmium Manganese Telluride). Showing records 1 – 2 of 2 total matches.

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University of Michigan

1. Chen, Chia-Chu. Multiple Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz.

Degree: PhD, Electrical Engineering, 2010, University of Michigan

Nondestructive evaluation is commonly used in science and industry to evaluate the properties of a material, component or system without causing damage. In this thesis, optical nondestructive evaluation tools are developed using a diluted magnetic semiconductor, CMT. A single <110> CMT crystal probe is employed as a sensor in both the microwave and THz electromagnetic wave region. Both theory and experimental results demonstrate that a diluted-magnetic-semiconductor CMT crystal exhibits both Faraday rotation and electric-field-induced linear birefringence. Utilizing this characteristic, a single probe that is capable of sensing both electric and magnetic fields independently is presented here. In addition, the linear electro-optic coefficient, r41 for CMT has been calculated from electric-field measurements to be 3.5 ± 0.2 pm/V. The ability to measure the electric or magnetic field components is exploited to develop a Poynting vector sensor that requires no further transformational calculation or physical information about the device. Maps of the microwave Poynting vector along a 50-Ω microstrip with different terminations were experimentally determined. An open termination microstrip shows no energy flow, whereas a matched-load microstrip shows consistent energy flow along the microstrip transmission line. These results demonstrate that the Poynting vector can be extracted from the components of the electric and magnetic field by utilizing a single <110> CMT crystal. CMT is also employed as an EO sensing crystal in a THz time-domain reflectometry system that is used to detect both surface and subsurface defects of thermal barrier coatings. A 50 μm surface defect of a thermal barrier coating is identified even though its width is beyond the diffraction limit associated with a 1-THz frequency component. Moreover, when a history of pulsed reflectometry measurements is maintained, this THz system can also monitor the evolution of thermally-induced oxide layers and voids – embedded at a ceramic/metal interface – that are on the order of a single micrometer in thickness. This was accomplished through the observation of THz pulse time delays and changes in the width and shape of the THz pulses. These features can be used to predict the lifetime of thermal-barrier coatings. Advisors/Committee Members: Whitaker, John F. (committee member), Grbic, Anthony (committee member), Jarrahi, Mona (committee member), Yalisove, Steven M. (committee member).

Subjects/Keywords: Multi-Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz; Electrical Engineering; Engineering; Science

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, C. (2010). Multiple Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/77810

Chicago Manual of Style (16th Edition):

Chen, Chia-Chu. “Multiple Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz.” 2010. Doctoral Dissertation, University of Michigan. Accessed March 02, 2021. http://hdl.handle.net/2027.42/77810.

MLA Handbook (7th Edition):

Chen, Chia-Chu. “Multiple Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz.” 2010. Web. 02 Mar 2021.

Vancouver:

Chen C. Multiple Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz. [Internet] [Doctoral dissertation]. University of Michigan; 2010. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/2027.42/77810.

Council of Science Editors:

Chen C. Multiple Birefringence Effects in the Diluted Magnetic Semiconductor Cadmium Manganese Telluride: Applications from Microwave to Terahertz. [Doctoral Dissertation]. University of Michigan; 2010. Available from: http://hdl.handle.net/2027.42/77810


University of Michigan

2. Chen, Chia-Chu. Multi-birefringence effects in the diluted magnetic semiconductor cadmium manganese telluride: Applications from microwave to terahertz.

Degree: PhD, Pure Sciences, 2010, University of Michigan

Nondestructive evaluation is commonly used in science and industry to evaluate the properties of a material, component or system without causing damage. In this thesis, optical nondestructive evaluation tools are developed using a diluted magnetic semiconductor, CMT. A single <110> CMT crystal probe is employed as a sensor in both the microwave and THz electromagnetic wave region. Both theory and experimental results demonstrate that a diluted-magnetic-semiconductor CMT crystal exhibits both Faraday rotation and electric-field-induced linear birefringence. Utilizing this characteristic, a single probe that is capable of sensing both electric and magnetic fields independently is presented here. In addition, the linear electro-optic coefficient, r41 for CMT has been calculated from electric-field measurements to be 3.5 +/- 0.2 pm/V. The ability to measure the electric or magnetic field components is exploited to develop a Poynting vector sensor that requires no further transformational calculation or physical information about the device. Maps of the microwave Poynting vector along a 50-O microstrip with different terminations were experimentally determined. An open termination microstrip shows no energy flow, whereas a matched-load microstrip shows consistent energy flow along the microstrip transmission line. These results demonstrate that the Poynting vector can be extracted from the components of the electric and magnetic field by utilizing a single <110> CMT crystal. CMT is also employed as an EO sensing crystal in a THz time-domain reflectometry system that is used to detect both surface and subsurface defects of thermal barrier coatings. A 50 mum surface defect of a thermal barrier coating is identified even though its width is beyond the diffraction limit associated with a 1-THz frequency component. Moreover, when a history of pulsed reflectometry measurements is maintained, this THz system can also monitor the evolution of thermally-induced oxide layers and voids – embedded at a ceramic/metal interface – that are on the order of a single micrometer in thickness. This was accomplished through the observation of THz pulse time delays and changes in the width and shape of the THz pulses. These features can be used to predict the lifetime of thermal-barrier coatings and to indicate a warning of imminent spallation conditions. Advisors/Committee Members: Whittaker, John F. (advisor).

Subjects/Keywords: Applications; Birefringence; Cadmium Manganese Telluride; Diluted; Effects; Electro-optic Sensing; Magnetic Semiconductor; Magneto-optic Sensing; Microwave; Multi; Terahertz

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chen, C. (2010). Multi-birefringence effects in the diluted magnetic semiconductor cadmium manganese telluride: Applications from microwave to terahertz. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/127156

Chicago Manual of Style (16th Edition):

Chen, Chia-Chu. “Multi-birefringence effects in the diluted magnetic semiconductor cadmium manganese telluride: Applications from microwave to terahertz.” 2010. Doctoral Dissertation, University of Michigan. Accessed March 02, 2021. http://hdl.handle.net/2027.42/127156.

MLA Handbook (7th Edition):

Chen, Chia-Chu. “Multi-birefringence effects in the diluted magnetic semiconductor cadmium manganese telluride: Applications from microwave to terahertz.” 2010. Web. 02 Mar 2021.

Vancouver:

Chen C. Multi-birefringence effects in the diluted magnetic semiconductor cadmium manganese telluride: Applications from microwave to terahertz. [Internet] [Doctoral dissertation]. University of Michigan; 2010. [cited 2021 Mar 02]. Available from: http://hdl.handle.net/2027.42/127156.

Council of Science Editors:

Chen C. Multi-birefringence effects in the diluted magnetic semiconductor cadmium manganese telluride: Applications from microwave to terahertz. [Doctoral Dissertation]. University of Michigan; 2010. Available from: http://hdl.handle.net/2027.42/127156

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