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Sub-THz Imaging Using Non-Resonant HEMT Detectors.

Juan A Delgado-Notario1, Jesus E Velazquez-Perez2, Yahya M Meziani3

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Summary

This study shows strained-silicon Modulation-doped Field-Effect Transistors (MODFETs) efficiently detect terahertz (THz) radiation. Enhancing photoresponse with a small current significantly improves detector performance for THz imaging applications.

Keywords:
MODFETSiGedetectorimagingplasma waveterahertz

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Area of Science:

  • Solid-state physics
  • Terahertz (THz) technology
  • Semiconductor device physics

Background:

  • Plasma waves in 2-D systems offer efficient detection of THz electromagnetic radiation.
  • Solid-state plasma wave sensors are suitable for THz imaging detectors.
  • Modulation-doped Field-Effect Transistors (MODFETs) are key components in advanced electronic systems.

Purpose of the Study:

  • To experimentally investigate the sub-THz response of II-gate strained-Si Schottky-gated MODFETs.
  • To characterize the performance of strained-Si MODFETs as THz detectors at 150 and 300 GHz.
  • To evaluate the impact of source-to-drain current on the photoresponse and responsivity.

Main Methods:

  • Experimental characterization of strained-Si MODFETs at 150 and 300 GHz.
  • Measurement of DC drain-to-source voltage response in photovoltaic mode.
  • Analysis of photoresponse enhancement under a weak source-to-drain current (5 μA).
  • Comparison of responsivity and Noise Equivalent Power (NEP) in different operating modes.

Main Results:

  • Non-resonant response observed in DC photovoltaic mode, consistent with theoretical models.
  • Substantial increase in photoresponse when a weak source-to-drain current was applied.
  • Responsivity enhanced by one order of magnitude compared to photovoltaic mode.
  • Reduced Noise Equivalent Power (NEP) in the subthreshold region.

Conclusions:

  • Strained-Si MODFETs exhibit excellent performance as THz detectors.
  • The enhanced photoresponse significantly improves detector capabilities.
  • These devices show great promise for THz imaging applications.