Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Poster Tuesday: Plasmonics and Nanooptics

O 46.4: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

Enhanced Confinement of Surface Plasmon Polaritons on InAs with a High Index Medium — •Konstantin G. Wirth, Lena Jung, Yixi Zhou, Andreas F. Hessler, and Thomas Taubner — Institute of Physics (IA), RWTH Aachen

The semiconductor InAs offers promising properties for applications in the field of plasmonics due to its low damping and easy tunabilty compared to metals and other semiconductors. Recently, on InAs-Nanowires 1D surface plasmons (SP) with a high confinement of λ₀/λ_p=34 and low damping rate have been observed by using infrared nearfield microscopy (s-SNOM)[1]. Simulations suggest that by depositing a thin layer of a high index material on the InAs an enhanced confinement of the SP can be achieved. In our work we use the phase change material (PCM) Ge₃Sb₂Te₆ as high index medium, which is switchable between an amorphous and a crystalline phase accompanied by a large refractive index change and low dielectric loss in the IR[2]. Switching the PCM between its amorphous and crystalline phase would further enable us to control the wavelength of the SP as well as its damping.
[1] Y. Zhou et al., Adv. Mater. 2018, 1802551
[2] A.-K. U. Michel et al., Adv. Optical Mater. 5, 1700261 (2017)