Dresden 2014 – scientific programme
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DS: Fachverband Dünne Schichten
DS 40: Focus Session: Resistive Switching by Redox and Phase Change Phenomena VII (Optical properties and theory of PC materials)
DS 40.2: Talk
Thursday, April 3, 2014, 11:45–12:00, CHE 89
Large area optical tuning of mid-infrared resonant nanostructures by using low-loss phase-change materials — Ann-Katrin Michel1, Peter Zalden2, 3, •Dmitry Chigrin1, Aaron Lindenberg2, 3, 4, and Thomas Taubner1 — 1Institute of Physics 1A, RWTH Aachen University, Aachen, Germany — 2Stanford Institute of Materials and Energy Physics, SLAC, Menlo Park, USA — 3PULSE Institute, SLAC, Menlo Park, USA — 4Department of Materials Science and Engineering, Stanford University, Stanford, USA
Phase-change materials (PCMs) are stable in at least an amorphous and a crystalline phase. This structural contrast of PCMs is accompa- nied by a huge difference of the refractive index n.
So-called metallic nanoantennas are able to produce significantly enhanced and confined electromagnetic fields. By varying the fabrication parameters, such as antenna material, geometry and substrate their resonance frequency can be tuned over a wide range. If these nanoantennas are embedded in PCMs, the variation in n can be used for tuning of the resonance. To minimize any damping due to a high absorption of PCMs, we chose Ge3Sb2Te6 as an example with a very small imaginary part ε2 of the dielectric function ε(ν) in the MIR [1].
Since reversible switching of the antenna resonances would allow for interesting applications e.g. in the field of plasmonics, we investigated the use of femtosecond laser pulses for reversible switching, where the huge benefit lies in the switching of several antenna arrays at the same time (total diameter ca. 270 μm2). [1] Michel et al. Nano Lett. 13 (8), 2013.