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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 81: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
CPP 81.2: Vortrag
Mittwoch, 18. März 2020, 15:45–16:00, WIL A317
Programmable Phase-Change Plasmonics with In3Sb1Te2 — •Andreas Heßler1, Sophia Wahl1, Till Leuteritz2, Matthias Wuttig1, Stefan Linden2, and Thomas Taubner1 — 1I. Institute of Physics (IA), RWTH Aachen — 2Physikalisches Institut, University of Bonn
The high optical contrast of non-volatile phase-change materials (PCMs) between their switchable amorphous and crystalline structural phases enables exciting nanophotonic functionalities [1,2]. So far, the employed PCMs mostly have dielectric optical properties in both phases. Now, we introduce the next-generation PCM In3Sb1Te2 (IST) for reconfigurable nanophotonics. In contrast to the commonly used PCMs, its optical properties change from dielectric to metallic upon crystallization in the whole infrared spectral range. We show how resonant metallic nanostructures can be directly written and erased in an IST thin film by a pulsed switching laser, enabling direct and reconfigurable lithography. With this new technology, we demonstrate striking resonance shifts of plasmonic nanoantennas of more than 4 µm, a programmable mid-infrared perfect absorber with nearly 90% absorptance as well as screening and nanoscale ”soldering” of metallic nanoantennas. Our novel concepts of programmable phase-change plasmonics could enable inexpensive fabrication and improved designs of programmable plasmonic devices for infrared optics, sensing and telecommunications.
[1] M. Wuttig et al., Nature Photonics 11, 465-476 (2017)
[2] F. Ding et al., Advanced Optical Materials 7, 1801709 (2019)