Terahertz generation using plasmonic photoconductive gratings
A photoconductive terahertz emitter based on plasmonic contact electrode gratings is presented and experimentally demonstrated. The nanoscale grating enables ultrafast and high quantum efficiency operation simultaneously, by reducing the photo-generated carrier transport path to the photoconductor c...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2012-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/14/10/105029 |
| _version_ | 1797751614993334272 |
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| author | Christopher W Berry Mona Jarrahi |
| author_facet | Christopher W Berry Mona Jarrahi |
| author_sort | Christopher W Berry |
| collection | DOAJ |
| description | A photoconductive terahertz emitter based on plasmonic contact electrode gratings is presented and experimentally demonstrated. The nanoscale grating enables ultrafast and high quantum efficiency operation simultaneously, by reducing the photo-generated carrier transport path to the photoconductor contact electrodes. The presented photoconductor eliminates the need for a short-carrier lifetime semiconductor, which limits the efficiency of conventional photoconductive terahertz emitters. Additionally, the photo-absorbing active area of the plasmonic photoconductive terahertz emitter can be increased without a significant increase in the capacitive loading to the terahertz radiating antenna, enabling high quantum-efficiency operation at high pump power levels by preventing the carrier screening effect and thermal breakdown. A plasmonic photoconductive terahertz emitter prototype based on the presented scheme is implemented and integrated with dipole antenna arrays on a semi-insulating In _0.53 Ga _0.47 As substrate. Emitted terahertz radiation is characterized in a terahertz time-domain spectroscopy setup, measuring a terahertz pulse width of 590 fs full-width at half maximum in response to 150 fs pump pulses at 925 nm. |
| first_indexed | 2024-03-12T16:52:06Z |
| format | Article |
| id | doaj.art-e86da8ab5cef4648b77aa6411efb8a68 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:52:06Z |
| publishDate | 2012-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-e86da8ab5cef4648b77aa6411efb8a682023-08-08T11:09:23ZengIOP PublishingNew Journal of Physics1367-26302012-01-01141010502910.1088/1367-2630/14/10/105029Terahertz generation using plasmonic photoconductive gratingsChristopher W Berry0Mona Jarrahi1Department of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, 1301 Beal Ave, Ann Arbor, MI 48109, USADepartment of Electrical Engineering and Computer Science, University of Michigan , Ann Arbor, 1301 Beal Ave, Ann Arbor, MI 48109, USAA photoconductive terahertz emitter based on plasmonic contact electrode gratings is presented and experimentally demonstrated. The nanoscale grating enables ultrafast and high quantum efficiency operation simultaneously, by reducing the photo-generated carrier transport path to the photoconductor contact electrodes. The presented photoconductor eliminates the need for a short-carrier lifetime semiconductor, which limits the efficiency of conventional photoconductive terahertz emitters. Additionally, the photo-absorbing active area of the plasmonic photoconductive terahertz emitter can be increased without a significant increase in the capacitive loading to the terahertz radiating antenna, enabling high quantum-efficiency operation at high pump power levels by preventing the carrier screening effect and thermal breakdown. A plasmonic photoconductive terahertz emitter prototype based on the presented scheme is implemented and integrated with dipole antenna arrays on a semi-insulating In _0.53 Ga _0.47 As substrate. Emitted terahertz radiation is characterized in a terahertz time-domain spectroscopy setup, measuring a terahertz pulse width of 590 fs full-width at half maximum in response to 150 fs pump pulses at 925 nm.https://doi.org/10.1088/1367-2630/14/10/105029 |
| spellingShingle | Christopher W Berry Mona Jarrahi Terahertz generation using plasmonic photoconductive gratings New Journal of Physics |
| title | Terahertz generation using plasmonic photoconductive gratings |
| title_full | Terahertz generation using plasmonic photoconductive gratings |
| title_fullStr | Terahertz generation using plasmonic photoconductive gratings |
| title_full_unstemmed | Terahertz generation using plasmonic photoconductive gratings |
| title_short | Terahertz generation using plasmonic photoconductive gratings |
| title_sort | terahertz generation using plasmonic photoconductive gratings |
| url | https://doi.org/10.1088/1367-2630/14/10/105029 |
| work_keys_str_mv | AT christopherwberry terahertzgenerationusingplasmonicphotoconductivegratings AT monajarrahi terahertzgenerationusingplasmonicphotoconductivegratings |