Orateur
Description
Abstract
Polaritons, which are quasiparticles composed of a photon coupled to an electric or magnetic dipole, are a major focus in nanophotonic research of low-dimensional materials. Polaritons can be active in a broad range of the electromagnetic spectrum (meVs to eVs) and exhibit momenta much higher than the corresponding free-space radiation. Hence, the use of high momentum broadband sources or probes is imperative to excite those quasiparticles and measure the
frequency-momentum dispersion relations, which provide insights into polariton dynamics. Synchrotron infrared nanospectroscopy[1] (SINS) is a technique that combines the nanoscale spatial resolution of scattering-type scanning near-field optical microscopy with synchrotron infrared radiation, making it highly suitable to probe and characterize a variety of polaritons. Here, the advances enabled by SINS on the study of key different types of polaritons from the THZ to mid-infrared will be described. In this talk, I will explore low-dimensional materials [2,3] as the polaritonic materials and their remarkable optical properties. I will present recent studies in the field of polaritons in contact with different interfaces dielectric/air(metal) and heterostructures using SINS. Furthermore, I will show that these experimental observations provide an attractive platform for understanding light-matter interaction and, therefore, could be harnessed in compact nanophotonic devices and applications involving subdiffractional light traffic.
Acknowledgments
FAPESP, CNPq, Brazilian Nanocarbon Institute of Science and Technology (INCT/Nanocarbono) and CNPEM.
References
[1] I. D. Barcelos, et al; Adv. Opt. Mater. 2020, 8, 1.
[2] I. D. Barcelos, et al; ACS Photonics 2021, 8, 10.
[3] F. H. Feres, et al; Nat. Commun. 2021, 12, 1.
