Reconfigurable Metamaterials for Terahertz Applications

Reconfigurable metamaterials are engineered assemblies of subwavelength elements whose electromagnetic response can be dynamically altered to control terahertz (THz) radiation. By integrating microelectromechanical systems (MEMS), phase‐change materials or stretchable substrates, these metadevices bridge the gap between static components and adaptive photonic systems. Key advances include MEMS‐driven split‐ring resonators that tune resonance frequencies across the THz band, three‐dimensional chiral structures for active polarisation control and magneto‐electro‐optical platforms enabling simultaneous electric and magnetic field modulation. Such reconfigurable platforms underpin a spectrum of applications from high‐speed wireless links and secure communications to chemical fingerprinting, non‐invasive bioimaging and compact spectroscopy. The capacity to steer beams, switch polarisation states or vary absorption in real time promises to transform THz technology, facilitating miniaturised, multifunctional systems for telecommunications, sensing and beyond.

Research from Nature Portfolio

Recent studies have demonstrated handswitchable chiral metamaterials employing vertically deformable MEMS spirals to achieve active polarisation modulation in the terahertz region. By pneumatically lifting planar spirals into three‐dimensional enantiomers, the devices produce reversible handedness switching, achieving polarisation rotation angles up to 28° and offering compact modulators for THz spectroscopy. In a complementary development, a reciprocal magneto‐electro‐optical effect has been realised in a plasmonic nanowire metamaterial mounted on a flexible nanomembrane. When subjected to concurrent electric and magnetic fields, this chevron‐patterned structure exhibits large, reversible transmission changes at low voltages and modest magnetic flux densities, yielding ultrafast modulation cycles suitable for field sensing and on‐chip modulation at THz frequencies.

Reconfigurable Metamaterials for Terahertz Applications publication trend

The graph below shows the total number of articles in reconfigurable metamaterials for terahertz applications across all publications each year (not limited to Nature Index journals).

Technical terms

Metamaterial: An artificial structure composed of subwavelength resonators engineered to exhibit tailored electromagnetic properties not found in natural materials.

Terahertz band: The portion of the electromagnetic spectrum between 0.1 THz and 10 THz, offering unique opportunities for imaging, sensing and high‐speed wireless communication.

Split‐ring resonator (SRR): A ring‐shaped metallic element with a gap that supports magnetic and electric resonances in the THz regime, widely used in tunable metamaterials.

MEMS (Microelectromechanical Systems): Miniaturised devices integrating mechanical and electrical components at the microscale, enabling dynamic reconfiguration of metamaterial elements.

Optical activity (chirality): The property of a structure to rotate the plane of polarisation of electromagnetic waves, exploited in chiral metamaterials for polarisation control.

References

1. Reconfigurable flexible metasurfaces: from fundamentals towards biomedical applications. PhotoniX (2024).
2. High-Efficiency Dynamic Terahertz Deflector Utilizing a Mechanically Tunable Metasurface. Research (2023).
3. Enantiomeric switching of chiral metamaterial for terahertz polarization modulation employing vertically deformable MEMS spirals. Nature Communications (2015).
4. A magneto-electro-optical effect in a plasmonic nanowire material. Nature Communications (2015).
5. Reconfigurable terahertz metamaterials: From fundamental principles to advanced 6G applications. iScience (2022).