Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.1: Poster

Tuesday, March 19, 2024, 16:30–19:00, Poster A

Efficient excitation of surface-acoustic waves with impedance-matched IDTs — •Kawa Noman, Yanik Kunz, Kevin Künstle, Vitaliy Vasyuchka, and Mathias Weiler — Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau(RPTU),Kaiserslautern,Germany

Microwave filters based on surface acoustic wave (SAW) devices exhibit minimal loss and operate at high frequencies. Here we study the efficient generation and detection of high amplitude SAWs with multichromatic waveforms. This involves the use of custom-designed interdigital transducers (IDTs) that are lithographically fabricated on piezoelectric substrates such as lithium niobate (LiNbO3). We use microwave stub tuners to match the IDT impedance to the external microwave circuit to maximise the power transfer and analyse the SAW devices using a vector network analyzer. Achieving a precise 50-ohm impedance match resulted in reduced insertion loss and voltage standing wave ratio. High-amplitude SAWs can be used for non-linear magnon generation [1].

[1] M. Geilen et. al, arXiv:2201.04033 (2022).

Keywords: Magnonics; Surface-acoustic waves