Fano Lineshapes and Rabi Splittings: Can They Be Artificially Generated or Obscured by the Numerical Aperture?

Autor: Geng Z; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands., Theenhaus J; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands., Patra BK; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands., Zheng JY; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands., Busink J; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands., Garnett EC; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands., Rodriguez SRK; Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands.
Jazyk: angličtina
Zdroj: ACS photonics [ACS Photonics] 2021 May 19; Vol. 8 (5), pp. 1271-1276. Date of Electronic Publication: 2021 May 04.
DOI: 10.1021/acsphotonics.1c00128
Abstrakt: Fano resonances and Rabi splittings are routinely reported in the scientific literature. Asymmetric resonance lineshapes are usually associated with Fano resonances, and two split peaks in the spectrum are often attributed to a Rabi splitting. True Fano resonances and Rabi splittings are unequivocal signatures of coherent coupling between subsystems. However, can the same spectral lineshapes characterizing Fano resonances and Rabi splittings arise from a purely incoherent sum of intensities? Here we answer this question through experiments with a tunable Fabry-Pérot cavity containing a CsPbBr 3 perovskite crystal. By measuring the transmission and photoluminescence of this system using microscope objectives with different numerical aperture ( NA ), we find that even a modest NA = 0.4 can artificially generate Fano resonances and Rabi splittings. We furthermore show that this modest NA can obscure the anticrossing of a bona fide strongly coupled light-matter system. Through transfer matrix calculations we confirm that these spectral artifacts are due to the incoherent sum of transmitted intensities at different angles captured by the NA . Our results are relevant to the wide nanophotonics community, characterizing dispersive optical systems with high numerical aperture microscope objectives. We conclude with general guidelines to avoid pitfalls in the characterization of such optical systems.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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