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You searched for subject:(magneto optic effects). Showing records 1 – 2 of 2 total matches.

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University of Michigan

1. 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

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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 April 18, 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. 18 Apr 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 Apr 18]. 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


Texas A&M University

2. Novikova, Irina Borisovna. Nonlinear magneto-optic effects in optically dense Rb vapor.

Degree: PhD, Physics, 2004, Texas A&M University

Nonlinear magneto-optical effects, originated from atomic coherence, are studied both theoretically and experimentally in thermal Rb vapor. The analytical description of the fundamental properties of coherent media are based on the simplified three- and four-level systems, and then verified using numerical simulations and experimental measurements. In particular, we analyze the modification of the long-lived atomic coherence due to various physical effects, such as reabsorption of spontaneous radiation, collisions with a buffer gas atoms, etc. We also discuss the importance of the high-order nonlinearities in the description of the polarization rotation for the elliptically polarized light. The effect of self-rotation of the elliptical polarization is also analyzed. Practical applications of nonlinear magneto-optical effects are considered in precision metrology and magnetometery, and for the generation of non-classical states of electromagnetic field. Advisors/Committee Members: Welch, George R. (advisor), Scully, Marlan O. (committee member), Hemmer, Phillip R. (committee member), Sokolov, Alexei V. (committee member).

Subjects/Keywords: quantum optics; nonlinear optics; coherent effects; magneto-optic effects

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

APA (6th Edition):

Novikova, I. B. (2004). Nonlinear magneto-optic effects in optically dense Rb vapor. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/364

Chicago Manual of Style (16th Edition):

Novikova, Irina Borisovna. “Nonlinear magneto-optic effects in optically dense Rb vapor.” 2004. Doctoral Dissertation, Texas A&M University. Accessed April 18, 2021. http://hdl.handle.net/1969.1/364.

MLA Handbook (7th Edition):

Novikova, Irina Borisovna. “Nonlinear magneto-optic effects in optically dense Rb vapor.” 2004. Web. 18 Apr 2021.

Vancouver:

Novikova IB. Nonlinear magneto-optic effects in optically dense Rb vapor. [Internet] [Doctoral dissertation]. Texas A&M University; 2004. [cited 2021 Apr 18]. Available from: http://hdl.handle.net/1969.1/364.

Council of Science Editors:

Novikova IB. Nonlinear magneto-optic effects in optically dense Rb vapor. [Doctoral Dissertation]. Texas A&M University; 2004. Available from: http://hdl.handle.net/1969.1/364

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