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Related Concept Videos

Active Filters01:25

Active Filters

797
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
797
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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...
232

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Related Experiment Video

Updated: Jun 16, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Microelectromechanical System-Based Reconfigurable Terahertz Metamaterial for Polarization Filter, Switch, and Logic

Binghui Li1, Zhenshan Yu1, Hao Chen2,3

  • 1School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510006, China.

ACS Applied Materials & Interfaces
|August 20, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a microelectromechanical systems-based reconfigurable terahertz metamaterial for dynamic THz wave control. The device enables real-time modulation of THz waves, demonstrating logic gate functionalities.

Keywords:
MEMSfilterpolarization switchprogrammable deviceterahertz metamaterial

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Area of Science:

  • Terahertz (THz) Photonics
  • Metamaterials
  • Microelectromechanical Systems (MEMS)

Background:

  • Terahertz (THz) metamaterials integrated with microelectromechanical systems (MEMS) enable dynamic control over THz wave properties.
  • Existing technologies offer limited real-time modulation capabilities for THz waves.

Purpose of the Study:

  • To demonstrate a MEMS-based reconfigurable THz metamaterial (RTM) for real-time THz wave modulation.
  • To investigate the polarization-dependent and voltage-actuated tuning of THz wave properties.
  • To explore the potential of RTMs for logic gate operations.

Main Methods:

  • Fabrication of a MEMS-based RTM utilizing a split ring resonator (SRR).
  • Characterization of THz wave modulation by varying incident polarization angle and DC bias voltage.
  • Analysis of resonant frequency shifts and modulation depth.
  • Implementation and testing of logic gate functionalities (NAND, AND).

Main Results:

  • The SRR resonant frequency shifts from 0.74 to 1.16 THz with increasing polarization angle.
  • A maximum modulation depth exceeding 70% was achieved.
  • Polarization-dependent transmission intensity and resonant frequency were actively tuned via DC bias.
  • Demonstrated logic gate operations: NAND at 0.439 THz and AND at 0.732 THz.

Conclusions:

  • The MEMS-based RTM offers dynamic and reconfigurable control of THz wave amplitude, phase, and polarization.
  • The device exhibits potential for implementing THz logic gates and modulators.
  • Proposed RTM has applications in tunable filters, optical switches, and programmable logic devices.