Photoconductive terahertz generation from textured semiconductor materials
Photoconductive (PC) terahertz (THz) emitters are often limited by ohmic loss and Joule heating—as these effects can lead to thermal runaway and premature device breakdown. To address this, the proposed work introduces PC THz emitters based on textured InP materials. The enhanced surface recombinati...
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| Format: | Online |
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Nature Publishing Group
2016
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793249/ |
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pubmed-47932492016-03-16 Photoconductive terahertz generation from textured semiconductor materials Collier, Christopher M. Stirling, Trevor J. Hristovski, Ilija R. Krupa, Jeffrey D. A. Holzman, Jonathan F. Article Photoconductive (PC) terahertz (THz) emitters are often limited by ohmic loss and Joule heating—as these effects can lead to thermal runaway and premature device breakdown. To address this, the proposed work introduces PC THz emitters based on textured InP materials. The enhanced surface recombination and decreased charge-carrier lifetimes of the textured InP materials reduce residual photocurrents, following the picosecond THz waveform generation, and this diminishes Joule heating in the emitters. A non-textured InP material is used as a baseline for studies of fine- and coarse-textured InP materials. Ultrafast pump-probe and THz setups are used to measure the charge-carrier lifetimes and THz response/photocurrent consumption of the respective materials and emitters. It is found that similar temporal and spectral characteristics can be achieved with the THz emitters, but the level of photocurrent consumption (yielding Joule heating) is greatly reduced in the textured materials. Nature Publishing Group 2016-03-16 /pmc/articles/PMC4793249/ /pubmed/26979292 http://dx.doi.org/10.1038/srep23185 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Collier, Christopher M. Stirling, Trevor J. Hristovski, Ilija R. Krupa, Jeffrey D. A. Holzman, Jonathan F. |
| spellingShingle |
Collier, Christopher M. Stirling, Trevor J. Hristovski, Ilija R. Krupa, Jeffrey D. A. Holzman, Jonathan F. Photoconductive terahertz generation from textured semiconductor materials |
| author_facet |
Collier, Christopher M. Stirling, Trevor J. Hristovski, Ilija R. Krupa, Jeffrey D. A. Holzman, Jonathan F. |
| author_sort |
Collier, Christopher M. |
| title |
Photoconductive terahertz generation from textured semiconductor materials |
| title_short |
Photoconductive terahertz generation from textured semiconductor materials |
| title_full |
Photoconductive terahertz generation from textured semiconductor materials |
| title_fullStr |
Photoconductive terahertz generation from textured semiconductor materials |
| title_full_unstemmed |
Photoconductive terahertz generation from textured semiconductor materials |
| title_sort |
photoconductive terahertz generation from textured semiconductor materials |
| description |
Photoconductive (PC) terahertz (THz) emitters are often limited by ohmic loss and Joule heating—as these effects can lead to thermal runaway and premature device breakdown. To address this, the proposed work introduces PC THz emitters based on textured InP materials. The enhanced surface recombination and decreased charge-carrier lifetimes of the textured InP materials reduce residual photocurrents, following the picosecond THz waveform generation, and this diminishes Joule heating in the emitters. A non-textured InP material is used as a baseline for studies of fine- and coarse-textured InP materials. Ultrafast pump-probe and THz setups are used to measure the charge-carrier lifetimes and THz response/photocurrent consumption of the respective materials and emitters. It is found that similar temporal and spectral characteristics can be achieved with the THz emitters, but the level of photocurrent consumption (yielding Joule heating) is greatly reduced in the textured materials. |
| publisher |
Nature Publishing Group |
| publishDate |
2016 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793249/ |
| _version_ |
1613552390039928832 |