Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 123: Nanostructured Surfaces and Thin Films III: Dots, Particles, Clusters (joint session O/CPP)
O 123.1: Talk
Friday, March 20, 2020, 10:30–10:45, WIL B321
Reconfigurable Polaritonics using Phase Change Materials — •Christina M. Spägele1, Xinghui Yin1, Michele Tamagnone1, Kundan Chaudhary1, Stefano L. Oscurato1,2, Jiahan Li3, Christoph Persch4, Ruoping Li1, Noah A. Rubin1, Luis A. Jauregui5, Kenji Watanabe6, Takashi Taniguchi6, Philip Kim1, Matthias Wuttig4, James H. Edgar3, Antonio Ambrosio1,7, and Federico Capasso1 — 1Harvard University, USA — 2Unina, Italy — 3KSU, USA — 4RWTH, Germany — 5UCLA, USA — 6NIMS, Japan — 7CNST-IIT, Italy
Polaritons garnered significant interest due to their ability of confining light to the nanoscale. They arise when light couples strongly to material excitations such as excitons, plasmons or phonons. To date, methods to control these highly confined states of light are not well-suited for free-form manipulation of polaritons. Moreover, they create systems that are unalterable after the initial fabrication process.
Placing the hyperbolic vdW-material hexagonal boron nitride on the phase change material (PCM) Ge3Sb2Te6, we successfully achieved spatial control of the propagation of surface phonon polaritons (SPhP) by structuring the PCM. The exponentially decaying tail of the guided SPhP modes interacts with the PCM, which can be optically switched to a higher refractive index crystalline phase, slowing the SPhP. We demonstrate rewritable waveguides and refractive optical elements such as lenses and prisms for mid-IR polaritons. Moreover, we will discuss reconfigurable metalenses that allow for precise wavefront engineering and diffraction-limited focusing.