High-performance terahertz modulators induced by substrate field in Te-based all-2D heterojunctions

Pujing Zhang; Qihang Liang; Qingli Zhou; Jinyu Chen; Menglei Li; Yuwang Deng; Wanlin Liang; Liangliang Zhang; Qinghua Zhang; Lin Gu; Chen Ge; Kui-juan Jin; Cunlin Zhang; Guozhen Yang

doi:10.1038/s41377-024-01393-6

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High-performance terahertz modulators induced by substrate field in Te-based all-2D heterojunctions

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- High-performance terahertz modulators induced by substrate field in Te-based all-2D heterojunctions
- Light: Science & Applications Vol. 13, Issue 3, Pages: 577-586(2024)
- Affiliations：
- Author bio：
  
  cqlzhou@cnu.edu.cn
  mgechen@iphy.ac.cn
- Funds：
- DOI：10.1038/s41377-024-01393-6
  CLC：
- Received：03 August 2023，
  
  Revised：17 January 2024，
  
  Accepted：2024-01-21，
  
  Published Online：05 March 2024，
  
  Published：2024-12
- Accepted：
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Pujing Zhang, Qihang Liang, Qingli Zhou, et al. High-performance terahertz modulators induced by substrate field in Te-based all-2D heterojunctions[J]. Light: science & applications, 2024, 13(3): 577-586.
DOI：

Pujing Zhang, Qihang Liang, Qingli Zhou, et al. High-performance terahertz modulators induced by substrate field in Te-based all-2D heterojunctions[J]. Light: science & applications, 2024, 13(3): 577-586. DOI： 10.1038/s41377-024-01393-6.

摘要

Abstract

High-performance active terahertz modulators as the indispensable core components are of great importance for the next generation communication technology. However

they currently suffer from the tradeoff between modulation depth and speed. Here

we introduce two-dimensional (2D) tellurium (Te) nanofilms with the unique structure as a new class of optically controlled terahertz modulators and demonstrate their integrated heterojunctions can successfully improve the device performances to the optimal and applicable levels among the existing all-2D broadband modulators. Further photoresponse measurements confirm the significant impact of the stacking order. We first clarify the direction of the substrate-induced electric field through first-principles calculations and uncover the unusual interaction mechanism in the photoexcited carrier dynamics associated with the charge transfer and interlayer exciton recombination. This advances the fundamental and applicative research of Te nanomaterials in high-performance terahertz optoelectronics.

We have introduced Te-based all-2D heterojunctions as optically controlled terahertz modulators to significantly promote the device performances and elaborated their charge dynamics driven by substrate effect through first-principles calculations.

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references

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