Observation of naturally canalized phonon polaritons in LIV2o5 thin layers

Severo Ochoa program from the Government of the Principality of Asturias (nos. PA-21 PF-BP20-117 and PA-20-PF-BP19-053, respectively); support by MCIN/AEI/10.13039/ 501100011033/FEDER,UE under grant PID2022-136784NB and by the Asturias FICYT under grant AYUD/2021/51185 with the support of FEDER funds; financial support from the Ramón y Cajal Program of the Government of Spain and FSE (RYC2018-026196-I), the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant no. PID2019-110308GA-I00/AEI/10.13039/501100011033) and project PCI2022-132953 funded by MCIN/AEI/10.13039/501100011033 and the EU “NextGenerationEU/PRTR”. A.Y.N. acknowledges the Spanish Ministry of Science and Innovation (grant PID2020-115221GB-C42) and the Basque Department of Education (grant PIBA-2023-1-0007); support from the European Research Council under Consolidator grant No. 101044461, TWISTOPTICS, and the Spanish Ministry of Science and Innovation (State Plan for Scientific and Technical Research and Innovation grant number PID2022-141304NB-I00).