Highly efficient terahertz generation using 3D Dirac semimetals
It is shown that three-dimensional Dirac semimetals are promising candidates for highly efficient optical-to-terahertz conversion due to their extreme optical nonlinearities. In particular, it is predicted that the conversion efficiency of (Formula presented.) exceeds typical materials like (Formula...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/170539 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | It is shown that three-dimensional Dirac semimetals are promising candidates for highly efficient optical-to-terahertz conversion due to their extreme optical nonlinearities. In particular, it is predicted that the conversion efficiency of (Formula presented.) exceeds typical materials like (Formula presented.) by >5000 times over nanoscale propagation distances. Studies show that even when no restrictions are placed on propagation distance, (Formula presented.) still outperforms (Formula presented.) in efficiency by >10 times. The results indicate that by tuning the Fermi energy, Pauli blocking can be leveraged to realize a step-like efficiency increase in the optical-to-terahertz conversion process. It is found that large optical-to-terahertz conversion efficiencies persists over a wide range of input frequencies, input field strengths, Fermi energies, and temperatures. These results could pave the way to the development of ultrathin-film terahertz sources for compact terahertz technologies. |
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