Speaker
Description
The combination of plasmonic nano-antennas and atomically thin semiconductors offers an ideal platform to explore light matter coupling on the nanoscale. One reason is that the natural Bohr radius of excitons in these materials is in the range of a few nanometers and therefore significantly smaller than the optical diffraction limit, i.e. the resolution of standard far-field optical setups. In contrast the near-fields of plasmonic nano-antennas naturally provide sub-diffraction limited confinement of light. It has been shown that the optical spectra of such hybrid nano-systems have distinct spectral features [1, 2]. In addition, the coupling results in the generation of enhanced linearly polarized absorption and emission of the involved excitons [1,2].
Here, we report on our first steps using a scattering type scanning near-field microscope to study the optical response of these coupled systems. Through the unprecedented optical resolution, we can expect deeper insights in the interplay between particle plasmons and monolayer excitons. Moreover, we expect the nanoscale optical excitation to actively change the resonance properties of the antenna, contributing to the overall optical properties of the hybrid system.
References
[1] J. Kern et al., ACS Photonics 2, 1260-1265 (2015)
[2] M. M. Petrić et al., Nano Lett. 22, 561-569 (2022)
