Abstract
This work examines the reflectivity and transmissivity of a transverse‐electric (TE) polarized wave incident on a microcavity containing strongly coupled excitons with in‐plane uniaxially oriented transition dipole moments, and a different interpretation to a previous report is presented. The propagation of the electric field inside the cavity is discussed, and a distinction is made between two different physical cases: the first, previously observed, and the second, which enables the interpretation of measurements carried out on a microcavity containing an oriented layer of liquid‐crystalline poly(9,9‐dioctylfluorene). In all cases, the reflected and transmitted electric fields derive from photons leaking parallel and perpendicular to the transition dipole moment orientation.
Highlights
Exciton-polaritons in solid state microcavities are an active field of research thanks to their potential for both fundamental (Bose Einstein condensation [1, 2, 3], light superfluidity [4, 5]) and practical applications
For microcavities containing excitons whose transition dipole moments are oriented in-plane along a given direction, the interpretation of the transmissivity and reflectivity spectra is less straightforward as the electric field in the polaritonic modes becomes fully concentrated along the transition dipole moment, a result previously demonstrated by Litinskaya et al [23] and Balagurov et al
Rabi-splitting energy induced by the excitons in the e y direction) the transmissivity and reflectivity exhibit two extrema which get closer in energy as is increased
Summary
Exciton-polaritons in solid state microcavities are an active field of research thanks to their potential for both fundamental (Bose Einstein condensation [1, 2, 3], light superfluidity [4, 5]) and practical applications (optical transistors [6], exciton-polariton lasers [7, 8], light-emitting diodes [9]). Rabi-splitting energy induced by the excitons in the e y direction) the transmissivity and reflectivity exhibit two extrema which get closer in energy as is increased Whilst this result resembles the one obtained when increasing in strongly coupled microcavities where has no preferential in-plane orientation, we show that the extrema are the superposition of separate intensities originating from the propagation of two waves dephased by experiencing either the permittivity brought about by the excitons along e (yielding the LP and UP y extrema) or the background permittivity along e x (yielding a photonic mode extremum). We support our results by fabricating and measuring the TE-reflectivity from a metallic microcavity containing an oriented layer of liquid-crystalline poly(9,9-dioctylfluorene) (PFO)
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