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<p>The terahertz (THz) frequency range holds enormous potential in widespread applications from condensed matter physics to security systems and quantum communications. Despite the progress revealed, the issue related to highly efficient and compatible THz emitters is still of particular importance. For decades, the photoconductive antennas (PCAs) have proved their efficiency in pulse spectroscopic and imaging setups thanks to their simplicity and versatility. Recently emerging plasmonic technology has significantly increased the performance of A<sub>3</sub>B<sub>5</sub>-semiconductor based PCAs. On the contrary, topological insulators (TIs) are very promising quantum materials with unique properties of charge carriers. We applied plasmonic technology to Bi<sub>2-x</sub>Sb<sub>x</sub>Te<sub>3-y</sub>Se<sub>y</sub> TI PCA to concentrate optical pump power at the PCA’s photoconductor surface that allowed us to achieve a 7.8-fold increase in amplitude compared to conventional TI-based PCA without plasmonic electrodes.</p>

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Plasmonic-Enhanced THz Emission from a Photoconductive Antenna Based on a Topological Insulator

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • P. M. Kovaleva,
  • K. A. Kuznetsov,
  • P. I. Kuznetsov,
  • D. V. Lavrukhin,
  • R. R. Galiev,
  • R. A. Khabibullin,
  • D. S. Ponomarev,
  • G. Kh. Kitaeva

摘要

The terahertz (THz) frequency range holds enormous potential in widespread applications from condensed matter physics to security systems and quantum communications. Despite the progress revealed, the issue related to highly efficient and compatible THz emitters is still of particular importance. For decades, the photoconductive antennas (PCAs) have proved their efficiency in pulse spectroscopic and imaging setups thanks to their simplicity and versatility. Recently emerging plasmonic technology has significantly increased the performance of A3B5-semiconductor based PCAs. On the contrary, topological insulators (TIs) are very promising quantum materials with unique properties of charge carriers. We applied plasmonic technology to Bi2-xSbxTe3-ySey TI PCA to concentrate optical pump power at the PCA’s photoconductor surface that allowed us to achieve a 7.8-fold increase in amplitude compared to conventional TI-based PCA without plasmonic electrodes.