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O: Fachverband Oberflächenphysik
O 57: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II
O 57.6: Vortrag
Mittwoch, 11. März 2026, 12:00–12:15, HSZ/0403
Spectral tuning of hyperbolic shear polaritons in monoclinic gallium oxide via isotopic substitution — •G. Carini1, M. Pradhan2, E. Gelzinyte1, A. Ardenghi3, S. Dixit4, M. Obst5,6, A. S. Senarath4, N. S. Mueller1, G. Alvarez-Perez1,7, K. Diaz-Granados4, R. A. Kowalski4, R. Niemann1, F. G. Kaps5, J. Wetzel5, R. B. Iyer2, P. Mazzolini8, M. Schubert9,10, J. M. Klopf11, J. T. Margraf12, O. Bierwagen3, M. Wolf1, K. Reuter1, L. M. Eng5,6, S. Kehr5,6, J. D. Caldwell4, C. Carbogno1, T. G. Folland2, M. R. Wagner3, and A. Paarmann1 — 1FHI, Berlin, Germany — 2University of Iowa, Iowa City, IA, USA — 3PDI, Berlin, Germany — 4Vanderbilt University, Nashville, TN, USA — 5TUD, Dresden, Germany — 6EXC 2147 (ct.qmat), Dresden, Germany — 7IIT, Lecce, Italy — 8University of Parma, Parma, Italy — 9University of Nebraska, Lincoln, NE, USA — 10Lund University, Lund, Sweden — 11HZDR, Dresden, Germany — 12University of Bayreuth, Bayreuth, Germany
This contribution reports a significant spectral tuning of hyperbolic shear polaritons (HShPs) in monoclinic gallium oxide (bGO) via isotopic substitution. HShPs are imaged in real-space with near-field optical microscopy, allowing for a model-free estimation of the frequency shift. Complementary far-field measurements and ab initio calculations - in good agreement with the near-field data - confirm the effectiveness of this estimation. This combined study demonstrates the possibility to support such highly directional polaritons in a hitherto inaccessible range, with great promise for future applications.
Keywords: Shear polaritons; Isotopic substitution; Near-field microscopy; DFT calculations; FTIR