Table 1 Performance Comparison of Terahertz MEMS vs. Non-MEMS Approaches
Scheme Type | Specific Technology | Actuation Mechanism | Advantages | Limitations | Application | Ref. |
|---|---|---|---|---|---|---|
MEMS | Electrostatic Actuation | Electric-field | Fast response, Low power consumption, High precision | Small displacement, High drive voltage, Integration challenges | THz switches, Tunable resonators, Beamforming | |
Thermal Actuation | Thermal expansion or phase transition | Large displacement, Continuous tuning | Slow response, High power consumption | Tunable resonators, Sensing | ||
Magnetic Actuation | External magnetic field | Non-contact control, Fast response, Large deformation | Complex materials, Fabrication difficulties | Polarization conversion, Tunable resonators | ||
Pneumatic Actuation | Air pressure differential | Large displacement, Bidirectional control, Continuously adjustable | Requires external air source, System complexity | Dynamic polarization switching, Tunable absorbers | ||
Piezoelectric Actuation | Inverse piezoelectric effect | High precision | Small stroke, High drive voltage | Precise tuning, Electromagnetic coupling modulation | ||
Non-MEMS | Phase-Change Material | Thermally, Electrically, or Optically induced phase transition | Non-volatility, High modulation depth, Broadband tuning | Limited phase transition temperature, Complex fabrication | 6 G communication modulators, Thermal sensors, Optical memory | |
Liquid Crystal | Electric-field controlled molecular orientation | Dynamic tuning, Low drive voltage, Flexible integration | Slow response, Require thick layers, Optical losses | Terahertz spatial light modulators, Polarization controllers, Imaging | ||
Graphene | Electrical tuning of Fermi level | Ultra-fast response, Broadband operation | Moderate modulation depth, Fabrication complexity | 6G communication modulators, Detectors, Sensors | ||
Topological Photonic Crystals | Structural design | Robust transport, Low loss, Immunity to defects | Limited bandwidth, High fabrication precision required | 6G on-chip waveguides, High-speed communication, Topological lasers | ||
Organic Mixed Ionic-Electronic Conductors | Electrical control of carrier concentration | Low cost, Flexible, Low operating voltage | Low charge carrier mobility, Understood THz response mechanism | Wearable sensors, Green terahertz electronics | ||
Non-Hermitian Metasurfaces | Optical pumping to modulate loss | Ultra-fast modulation, Chiral transmission asymmetry | Exceptional point sensitivity, Moderate efficiency, Narrowband | Terahertz polarization modulators, High-sensitivity sensing |
