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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Terahertz Detectors Using Microelectromechanical System Resonators.

Chao Li1, Ya Zhang1, Kazuhiko Hirakawa2,3

  • 1Institute of Engineering, Tokyo University of Agriculture and Technology, Koganei-shi 184-8588, Japan.

Sensors (Basel, Switzerland)
|July 14, 2023
PubMed
Summary
This summary is machine-generated.

Doubly clamped microelectromechanical system (MEMS) beam resonators offer highly sensitive terahertz (THz) detection. Their frequency shift, proportional to absorbed THz radiation, enables precise measurement of this radiation.

Keywords:
bolometermicroelectromechanical system (MEMS) resonatorsterahertz (THz) detectionthermal sensitivity

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Microelectromechanical systems (MEMS) resonators possess high quality (Q-) factors, enabling sensitive frequency measurements.
  • Terahertz (THz) radiation detection requires sensitive and fast methods.

Purpose of the Study:

  • To provide a comprehensive overview of THz bolometers utilizing doubly clamped MEMS beam resonators.
  • To detail the working principle, readout mechanisms, detection speed, and sensitivity of these THz detectors.

Main Methods:

  • Reviewing the fundamental working principle of MEMS resonators for THz absorption.
  • Analyzing frequency shift detection as a readout mechanism.
  • Examining performance metrics including detection speed and sensitivity.

Main Results:

  • MEMS resonators exhibit high sensitivity to THz radiation due to frequency shifts caused by temperature changes.
  • The frequency shift is directly proportional to the absorbed THz power, allowing for quantification.
  • Various strategies for performance enhancement are discussed.

Conclusions:

  • Doubly clamped MEMS beam resonators are a promising platform for fast and sensitive THz detection.
  • The frequency-shift scheme offers a robust method for THz metrology.
  • Further improvements in MEMS resonator design can enhance THz detector performance.