%0 Journal Article %1 2023controlling %A Matson, Joseph %A Wasserroth, Sören %A Ni, Xiang %A Obst, Maximilian %A Diaz-Granados, Katja %A Carini, Giulia %A Renzi, Enrico Maria %A Galiffi, Emanuele %A Folland, Thomas G. %A Eng, Lukas M. %A Klopf, J. Michael %A Mastel, Stefan %A Armster, Sean %A Gambin, Vincent %A Wolf, Martin %A Kehr, Susanne C. %A Alu, Andrea %A Paarmann, Alexander %A Caldwell, Joshua D. %D 2023 %J Nat. Commun. %K a %N 1 %P 5240 %R 10.1038/s41467-023-40789-7 %T Controlling the propagation asymmetry of hyperbolic shear polaritons in beta-gallium oxide %U https://doi.org/10.1038/s41467-023-40789-7 %V 14 %X Structural anisotropy in crystals is crucial for controlling light propagation, particularly in the infrared spectral regime where optical frequencies overlap with crystalline lattice resonances, enabling light-matter coupled quasiparticles called phonon polaritons (PhPs). Exploring PhPs in anisotropic materials like hBN and MoO3 has led to advancements in light confinement and manipulation. In a recent study, PhPs in the monoclinic crystal β-Ga2O3 (bGO) were shown to exhibit strongly asymmetric propagation with a frequency dispersive optical axis. Here, using scanning near-field optical microscopy (s-SNOM), we directly image the symmetry-broken propagation of hyperbolic shear polaritons in bGO. Further, we demonstrate the control and enhancement of shear-induced propagation asymmetry by varying the incident laser orientation and polariton momentum using different sizes of nano-antennas. Finally, we observe significant rotation of the hyperbola axis by changing the frequency of incident light. Our findings lay the groundwork for the widespread utilization and implementation of polaritons in low-symmetry crystals.

@article{2023controlling, abstract = {Structural anisotropy in crystals is crucial for controlling light propagation, particularly in the infrared spectral regime where optical frequencies overlap with crystalline lattice resonances, enabling light-matter coupled quasiparticles called phonon polaritons (PhPs). Exploring PhPs in anisotropic materials like hBN and MoO3 has led to advancements in light confinement and manipulation. In a recent study, PhPs in the monoclinic crystal β-Ga2O3 (bGO) were shown to exhibit strongly asymmetric propagation with a frequency dispersive optical axis. Here, using scanning near-field optical microscopy (s-SNOM), we directly image the symmetry-broken propagation of hyperbolic shear polaritons in bGO. Further, we demonstrate the control and enhancement of shear-induced propagation asymmetry by varying the incident laser orientation and polariton momentum using different sizes of nano-antennas. Finally, we observe significant rotation of the hyperbola axis by changing the frequency of incident light. Our findings lay the groundwork for the widespread utilization and implementation of polaritons in low-symmetry crystals.}, added-at = {2023-10-17T09:47:50.000+0200}, author = {Matson, Joseph and Wasserroth, Sören and Ni, Xiang and Obst, Maximilian and Diaz-Granados, Katja and Carini, Giulia and Renzi, Enrico Maria and Galiffi, Emanuele and Folland, Thomas G. and Eng, Lukas M. and Klopf, J. Michael and Mastel, Stefan and Armster, Sean and Gambin, Vincent and Wolf, Martin and Kehr, Susanne C. and Alu, Andrea and Paarmann, Alexander and Caldwell, Joshua D.}, biburl = {https://www.bibsonomy.org/bibtex/23c8db94158b5a07dfca8ce65767d31b8/ctqmat}, day = 28, description = {Controlling the propagation asymmetry of hyperbolic shear polaritons in beta-gallium oxide | Nature Communications}, doi = {10.1038/s41467-023-40789-7}, interhash = {dbc6954f0b2e4f67c7c93ac049dc3a36}, intrahash = {3c8db94158b5a07dfca8ce65767d31b8}, journal = { Nat. Commun.}, keywords = {a}, month = {08}, number = 1, pages = {5240 }, timestamp = {2024-02-22T17:18:23.000+0100}, title = {Controlling the propagation asymmetry of hyperbolic shear polaritons in beta-gallium oxide}, url = {https://doi.org/10.1038/s41467-023-40789-7}, volume = 14, year = 2023 }