Nano-optical imaging of WSe2 waveguide modes revealing light-exciton interactions

Autor:	Fei, Z., Scott, M. E., Gosztola, D. J., Foley IV, J. J., Yan, J., Mandrus, D. G., Wen, H., Zhou, P., Zhang, D. W., Sun, Y., Guest, J. R., Gray, S. K., Bao, W., Wiederrecht, G. P., Xu, X.
Rok vydání:	2016
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.94.081402
Popis:	We report on nano-optical imaging study of WSe2 thin flakes with the scanning near-field optical microscopy (NSOM). The NSOM technique allows us to visualize in real space various waveguide photon modes inside WSe2. By tuning the excitation laser energy, we are able to map the entire dispersion of these waveguide modes both above and below the A exciton energy of WSe2. We found that all the modes interact strongly with WSe2 excitons. The outcome of the interaction is that the observed waveguide modes shift to higher momenta right below the A exciton energy. At higher energies, on the other hand, these modes are strongly damped due to adjacent B excitons or band edge absorptions. The mode-shifting phenomena are consistent with polariton formation in WSe2. Comment: 19 pages, 12 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1601.02133 Zobrazit plný text záznamu View this record from Arxiv