Reconfiguring Magnetic Infrared Resonances with the Plasmonic Phase-Change Material In3SbTe2

For miniaturized active nanophotonic components like adjustable lenses, resonance tuning of nanoantennas isessential. Phase-change materials (PCMs) have been establishedas prime candidates for nonvolatile resonance tuning based on achange in the refractive index. Currently, a novel material class ofswitchable infrared plasmonic PCMs, like In3SbTe2(IST), isemerging. Because IST can be locally optically switched betweendielectric (amorphous) and metallic (crystalline) states, it becomespossible to directly change the geometry and shape of nano-antennas to tune their infrared resonances. Here, crystalline ISTsplit-ring resonators (SRRs) are directly optically written andreconfigured to continuously tune their magnetic dipole resonancewavelengths from 10.6 to 8.2 mu m without changing their electricdipole (ED) resonances. The SRRs are further modified into crescents and J-antennas, displaying electric quadrupole and rotated EDmodes, respectively. Our concepts may be well suited for rapid prototyping, speeding up workflows for engineering ultrathin,tunable, plasmonic devices for infrared nanophotonics.

Automated summary

This study demonstrates the use of phase-change materials to tune the resonance of nanoantennas, offering potential for rapid prototyping and enhanced workflow efficiency in infrared nanophotonics.