Details

Autor(en) / Beteiligte

• Wang, Qian
• Rogers, Edward T. F.
• Gholipour, Behrad
• Wang, Chih-Ming
• Yuan, Guanghui
• Teng, Jinghua
• Zheludev, Nikolay I.

Titel

Optically reconfigurable metasurfaces and photonic devices based on phase change materials

Ist Teil von

• Nature photonics, 2016-01, Vol.10 (1), p.60-65

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Photonic components with adjustable parameters, such as variable-focal-length lenses or spectral filters, which can change functionality upon optical stimulation, could offer numerous useful applications. Tuning of such components is conventionally achieved by either micro- or nanomechanical actuation of their constituent parts, by stretching or by heating. Here, we report a novel approach for making reconfigurable optical components that are created with light in a non-volatile and reversible fashion. Such components are written, erased and rewritten as two-dimensional binary or greyscale patterns into a nanoscale film of phase-change material by inducing a refractive-index-changing phase transition with tailored trains of femtosecond pulses. We combine germanium-antimony-tellurium-based films with a diffraction-limited resolution optical writing process to demonstrate a variety of devices: visible-range reconfigurable bichromatic and multi-focus Fresnel zone plates, a super-oscillatory lens with subwavelength focus, a greyscale hologram, and a dielectric metamaterial with on-demand reflection and transmission resonances.