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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

880
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
880
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

528
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
528

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Updated: Jan 10, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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See through metallic sensor implemented using proximity resonant coupling.

Thamer Almoneef1, Shehroze Amir2, Muhammad Amin3

  • 1Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia. t.almoneef@psau.edu.sa.

Scientific Reports
|November 26, 2025
PubMed
Summary
This summary is machine-generated.

A new ground-less circular patch resonator offers high-sensitivity metal detection up to 8 cm. This sensor selectively detects metallic objects, even through dielectric barriers, by monitoring transmission coefficient changes.

Keywords:
Ground penetrating radarsMetal cracksMetal detectorsMicrowave sensorsProximity detectionResonanceSee-through wall

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Sensor Technology

Background:

  • Metal detection is crucial for security and industrial quality control.
  • Existing methods may lack selectivity or range for certain applications.

Purpose of the Study:

  • To introduce a novel ground-less circular patch resonator for enhanced metal detection.
  • To achieve high sensitivity and selectivity exclusively for metallic objects.

Main Methods:

  • Utilizing electric field coupling between an open stub resonator and metallic targets.
  • Monitoring changes in the transmission coefficient for detection.
  • Engineering a circular patch resonator for extended detection range.

Main Results:

  • Achieved a detection range of up to 8 cm for metallic objects.
  • Demonstrated selective sensitivity to metallic materials, ignoring dielectric objects.
  • Observed stronger resonance coupling (frequency shift, -10 dB transmission dip) with decreasing object distance.

Conclusions:

  • The proposed sensor provides a novel approach for high-sensitivity, selective metal detection.
  • The design enables 'see-through' metal detection and crack detection in metallic components.
  • Potential applications include security, industrial inspection, and ground penetration radar (GPR) systems.