Metasurfaces Enabled by Locally Tailoring Disorder in Phase-Change Materials

Hafermann M, Schoeppe P, Rensberg J, Ronning C (2018)

Publication Type: Journal article

Publication year: 2018

Journal

ACS Photonics American Chemical Society

Book Volume: 5

Pages Range: 5103-5109

Journal Issue: 12

DOI: 10.1021/acsphotonics.8b01441

Abstract

Active optical metasurfaces with dynamic switchable, tunable, and reconfigurable optical functionalities are an emerging field in photonics and optoelectronics. Especially, chalcogenide-based phase-change materials, such as Ge 2 Sb 2 Te 5 (GST), can be fast and repeatedly switched by external stimuli between crystalline and amorphous states, typically accompanied by a tremendous difference of the electronic and photonic properties. Here, we demonstrate that focused ion beam-induced disorder in highly confined regions can transform phase-change materials in active optical metasurfaces by locally adjusting the phase. A careful control of the amount of disorder can locally tailor the effective refractive index in GST films on the nanometer scale, which is highly promising for multilevel switching applications. In contrast to direct laser writing, focused ion beam irradiation enables the fabrication of subwavelength-scaled, planar, nonvolatile, and reconfigurable optical metasurfaces, with pattern sizes clearly below the diffraction limit of common laser light sources.

Involved external institutions

Friedrich-Schiller-Universität Jena DE Germany (DE)

How to cite

APA:

Hafermann, M., Schoeppe, P., Rensberg, J., & Ronning, C. (2018). Metasurfaces Enabled by Locally Tailoring Disorder in Phase-Change Materials. ACS Photonics, 5(12), 5103-5109. https://doi.org/10.1021/acsphotonics.8b01441

MLA:

Hafermann, Martin, et al. "Metasurfaces Enabled by Locally Tailoring Disorder in Phase-Change Materials." ACS Photonics 5.12 (2018): 5103-5109.

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