Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Poster II

DS 20.3: Poster

Thursday, March 21, 2024, 18:00–20:30, Poster D

Design of lithium niobate on silicon surface acoustic waveguide for hybrid integrated phononic circuits — •Matthias Volz, Emeline Denise Sophie Nysten, Matthias Weiß, and Hubert Krenner — Universität Münster, Physikalisches Institut, Wilhelm-Klemm-Str. 10, 48149 Münster

Surface acoustic waves (SAWs) have proven to be effective in the control and manipulation of elementary excitations in condensed matter [1, 2]. In particular, SAWs have been efficiently used to interact with spin waves in magnetic thin film, which shows great potential for the realization of novel microwave devices [3]. In this work, the design of a lithium niobate on silicon (LNoSi) phononic waveguide is presented. The localization of the SAW propagation inside a phononic waveguide will enhance the coupling to hybrid quantum mechanical systems, such as spin waves. Furthermore, the used LNoSi platform offers many other advantages such as high piezoelectric coupling, the capability of photonic waveguiding in addition to the phononic modes, as well as the possibility of non-linear optics. The fundamental phononic waveguide modes determined by the waveguide geometry will be simulated using finite element methods and the phononic dispersion will be studied by varying the waveguide width and height. [1] Delsing et al., J. Phys. D: Appl. Phys. 52(35):353001 (2019) [2] Bühler et al., Nat. Commun. 13:6998 (2022) [3] Küß et al., Phys. Rev. B 107:024424 (2023)

Keywords: surface acoustic waves; integrated phononics; waveguides