Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations
Carbon nanotubes possess appealing properties for terahertz (THz) applications. This work investigates the contribution of these properties in the context of THz photoconductive (PC) switches as THz detectors. The analysis engages the received THz electric field, the optical excitation, and the phot...
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| Format: | Article |
| Language: | English |
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IEEE
2012-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/6210341/ |
| _version_ | 1818457985380253696 |
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| author | B. Heshmat H. Pahlevaninezhad T. E. Darcie |
| author_facet | B. Heshmat H. Pahlevaninezhad T. E. Darcie |
| author_sort | B. Heshmat |
| collection | DOAJ |
| description | Carbon nanotubes possess appealing properties for terahertz (THz) applications. This work investigates the contribution of these properties in the context of THz photoconductive (PC) switches as THz detectors. The analysis engages the received THz electric field, the optical excitation, and the photocarrier dynamics of the carbon nanotube material through Drude-Smith theory and equivalent circuit model. Through this analysis, the effect of each parameter in the detected current can be investigated. Based on a realistic numerical assessment and comparison with our measurements for a conventional LT-GaAs PC switch, it is found that improvement in detected current is theoretically achievable, depending on the relative value of the imaginary photoconductivity of the CNT film. This is a parameter that can be varied through chemical treatment of the film. We found that, unlike the case of PC switches as THz emitting devices where a higher mobility is desired for higher output THz power, the detected current in the THz receiving PC switch is a nonmonotonic function of the mobility in the single-wall carbon nanotubes (SWNT) film. The capabilities and limitations revealed in this study set guidelines for fabrication and optimization of more efficient carbon nanotube-based THz receiving PC switches. The study also addresses the fabrication process and challenges. |
| first_indexed | 2024-12-14T22:51:16Z |
| format | Article |
| id | doaj.art-92732fa7de4d43839bdb8b2bbc170f25 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-14T22:51:16Z |
| publishDate | 2012-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-92732fa7de4d43839bdb8b2bbc170f252022-12-21T22:44:42ZengIEEEIEEE Photonics Journal1943-06552012-01-014397098510.1109/JPHOT.2012.22022826210341Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and LimitationsB. Heshmat0H. Pahlevaninezhad1T. E. Darcie2Department of Electrical and Computer Engineering, University of Victoria, Victoria, CanadaDepartment of Electrical and Computer Engineering, University of Victoria , Victoria, CanadaDepartment of Electrical and Computer Engineering, University of Victoria, Victoria, CanadaCarbon nanotubes possess appealing properties for terahertz (THz) applications. This work investigates the contribution of these properties in the context of THz photoconductive (PC) switches as THz detectors. The analysis engages the received THz electric field, the optical excitation, and the photocarrier dynamics of the carbon nanotube material through Drude-Smith theory and equivalent circuit model. Through this analysis, the effect of each parameter in the detected current can be investigated. Based on a realistic numerical assessment and comparison with our measurements for a conventional LT-GaAs PC switch, it is found that improvement in detected current is theoretically achievable, depending on the relative value of the imaginary photoconductivity of the CNT film. This is a parameter that can be varied through chemical treatment of the film. We found that, unlike the case of PC switches as THz emitting devices where a higher mobility is desired for higher output THz power, the detected current in the THz receiving PC switch is a nonmonotonic function of the mobility in the single-wall carbon nanotubes (SWNT) film. The capabilities and limitations revealed in this study set guidelines for fabrication and optimization of more efficient carbon nanotube-based THz receiving PC switches. The study also addresses the fabrication process and challenges.https://ieeexplore.ieee.org/document/6210341/Terahertz (THz)photoconductive (PC) switchphotomixerscarbon nanotubes |
| spellingShingle | B. Heshmat H. Pahlevaninezhad T. E. Darcie Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations IEEE Photonics Journal Terahertz (THz) photoconductive (PC) switch photomixers carbon nanotubes |
| title | Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations |
| title_full | Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations |
| title_fullStr | Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations |
| title_full_unstemmed | Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations |
| title_short | Carbon Nanotube-Based Photoconductive Switches for THz Detection: An Assessment of Capabilities and Limitations |
| title_sort | carbon nanotube based photoconductive switches for thz detection an assessment of capabilities and limitations |
| topic | Terahertz (THz) photoconductive (PC) switch photomixers carbon nanotubes |
| url | https://ieeexplore.ieee.org/document/6210341/ |
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