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Optically Controlling Broadband Terahertz Modulator Based on Layer-Dependent PtSe2 Nanofilms.

Hong Su1,2, Zesong Zheng1,2, Zhisheng Yu1,2

  • 1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China.

Nanomaterials (Basel, Switzerland)
|March 11, 2023
PubMed
Summary

A 3-layer Platinum Diselenide (PtSe₂) nanofilm acts as an effective optically controlled terahertz modulator. This PtSe₂ device demonstrates broadband amplitude modulation with significant modulation depth, suitable for terahertz applications.

Keywords:
PtSe2modulatorphotoconductivityterahertz

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Terahertz Technology

Background:

  • Terahertz (THz) modulators are crucial for THz communication and imaging systems.
  • Developing efficient and broadband THz modulators remains a significant challenge.
  • Platinum Diselenide (PtSe₂) is an emerging material with tunable electronic properties.

Purpose of the Study:

  • To investigate the performance of layer-dependent PtSe₂ nanofilms as optically controlled broadband terahertz modulators.
  • To determine the optimal layer thickness of PtSe₂ for THz modulation.
  • To characterize the modulation capabilities of PtSe₂ devices in the terahertz frequency range.

Main Methods:

  • Fabrication of PtSe₂ nanofilms with varying layer numbers (3, 6, 10, 20 layers) on a high-resistance silicon substrate.
  • Utilizing an optical pump and terahertz probe system to measure surface photoconductivity.
  • Employing terahertz time-domain spectroscopy (THz-TDS) to evaluate broadband amplitude modulation.
  • Applying Drude-Smith model fitting to extract material parameters like plasma frequency (ω) and scattering time (τ).

Main Results:

  • A 3-layer PtSe₂ nanofilm exhibited superior surface photoconductivity compared to thicker films.
  • The 3-layer film showed a higher plasma frequency (0.23 THz) and a lower scattering time (70 fs).
  • Broadband amplitude modulation from 0.1-1.6 THz was achieved with a 3-layer PtSe₂ film, reaching a modulation depth of 50.9% at 2.5 W/cm² pump density.

Conclusions:

  • PtSe₂ nanofilms, particularly the 3-layer variant, are highly suitable for optically controlled broadband terahertz modulators.
  • The layer-dependent properties of PtSe₂ enable fine-tuning for optimal THz modulation performance.
  • This research validates the potential of PtSe₂-based devices in advanced terahertz applications.