Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system
A terahertz time domain pulsed spectroscopy system is modified to provide fully polarimetric radiation and analysis. The operation of this polarimetry system is characterized using a birefringent, x-cut quartz crystal. The modification is based on rotating the photoconductive antennas such that both...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-02-01
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| Series: | Frontiers in Physics |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2024.1317576/full |
| _version_ | 1797324122858979328 |
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| author | Nikita Gurjar Morgan E. Ware Morgan E. Ware Magda El-Shenawee Magda El-Shenawee |
| author_facet | Nikita Gurjar Morgan E. Ware Morgan E. Ware Magda El-Shenawee Magda El-Shenawee |
| author_sort | Nikita Gurjar |
| collection | DOAJ |
| description | A terahertz time domain pulsed spectroscopy system is modified to provide fully polarimetric radiation and analysis. The operation of this polarimetry system is characterized using a birefringent, x-cut quartz crystal. The modification is based on rotating the photoconductive antennas such that both the emitted and detected polarizations are out of the plane of incidence. Subsequently, broadband wire grid polarizers are used to select the incident and detected direction of linear polarization to be either parallel with (vertical) or perpendicular to (horizontal) the plane of incidence with the sample surface. The experiments are conducted in both transmission and reflection. Depending on the frequency, the phase retardation of the incoming electric field components along the two perpendicular optical axes of the quartz crystal changes differently. This results in the polarization of the light exiting the crystal changing with frequency. As a result, multiple frequencies are identified where the crystal behaves as a near ideal quarter-, half-, or full-wave retarder. Additionally, due to the time-domain nature of the experiment, transmitted and reflected electric fields are measured after multiple consecutive reflections within the crystal. This leads to a further, complex control over the final polarization state of the signal. Finally, images of a resolution standard are obtained demonstrating the characteristics of the polarimetry system. |
| first_indexed | 2024-03-08T05:45:41Z |
| format | Article |
| id | doaj.art-617fe44f4f574a88b7b1ab262de1f283 |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-03-08T05:45:41Z |
| publishDate | 2024-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-617fe44f4f574a88b7b1ab262de1f2832024-02-05T10:30:21ZengFrontiers Media S.A.Frontiers in Physics2296-424X2024-02-011210.3389/fphy.2024.13175761317576Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy systemNikita Gurjar0Morgan E. Ware1Morgan E. Ware2Magda El-Shenawee3Magda El-Shenawee4Department of Electrical Engineering and Computer Science, University of Arkansas, Fayetteville, AR, United StatesDepartment of Electrical Engineering and Computer Science, University of Arkansas, Fayetteville, AR, United StatesMaterial Science and Engineering, University of Arkansas, Fayetteville, AR, United StatesDepartment of Electrical Engineering and Computer Science, University of Arkansas, Fayetteville, AR, United StatesMaterial Science and Engineering, University of Arkansas, Fayetteville, AR, United StatesA terahertz time domain pulsed spectroscopy system is modified to provide fully polarimetric radiation and analysis. The operation of this polarimetry system is characterized using a birefringent, x-cut quartz crystal. The modification is based on rotating the photoconductive antennas such that both the emitted and detected polarizations are out of the plane of incidence. Subsequently, broadband wire grid polarizers are used to select the incident and detected direction of linear polarization to be either parallel with (vertical) or perpendicular to (horizontal) the plane of incidence with the sample surface. The experiments are conducted in both transmission and reflection. Depending on the frequency, the phase retardation of the incoming electric field components along the two perpendicular optical axes of the quartz crystal changes differently. This results in the polarization of the light exiting the crystal changing with frequency. As a result, multiple frequencies are identified where the crystal behaves as a near ideal quarter-, half-, or full-wave retarder. Additionally, due to the time-domain nature of the experiment, transmitted and reflected electric fields are measured after multiple consecutive reflections within the crystal. This leads to a further, complex control over the final polarization state of the signal. Finally, images of a resolution standard are obtained demonstrating the characteristics of the polarimetry system.https://www.frontiersin.org/articles/10.3389/fphy.2024.1317576/fullterahertz imagingspectroscopywave polarimetryx-cut crystalbirefringent waveplate |
| spellingShingle | Nikita Gurjar Morgan E. Ware Morgan E. Ware Magda El-Shenawee Magda El-Shenawee Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system Frontiers in Physics terahertz imaging spectroscopy wave polarimetry x-cut crystal birefringent waveplate |
| title | Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system |
| title_full | Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system |
| title_fullStr | Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system |
| title_full_unstemmed | Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system |
| title_short | Experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system |
| title_sort | experimental characterization of a fully polarimetric pulsed terahertz spectroscopy system |
| topic | terahertz imaging spectroscopy wave polarimetry x-cut crystal birefringent waveplate |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2024.1317576/full |
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