Photoconductive Arrays on Insulating Substrates for High-Field Terahertz Generation
| Autor: | Paul Dean, Lianhe Li, David R. Bacon, Aniela Dunn, Alexander Giles Davies, Edmund H. Linfield, Joshua R. Freeman, Thomas B. Gill, Mark C. Rosamond, Andrew D. Burnett |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Laser noise
Fabrication Materials science Terahertz radiation business.industry Photoconductivity Bandwidth (signal processing) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Terahertz spectroscopy and technology 010309 optics Optical rectification Optics 0103 physical sciences High field 0210 nano-technology business |
| ISSN: | 1094-4087 |
| Popis: | We report on the design, fabrication and characterisation of large-area photoconductive THz array structures, consisting of a thin LT-GaAs active region transferred to an insulating substrate using a wafer-scale bonding process. The electrically insulating, transparent substrate reduces the parasitic currents in the devices, allowing peak THz-fields as high as 120 kV cm−1 to be generated over a bandwidth >5 THz. These results are achieved using lower pulse energies than demanded by conventional photoconductive arrays and other popular methods of generating high-field THz radiation. Two device sizes are fully characterised and the emission properties are compared to generation by optical rectification in ZnTe. The device can be operated in an optically saturated regime in order to suppress laser noise. |
| Databáze: | OpenAIRE |
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