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- W2891813088 abstract "Control is exerted over the exciton-polariton physics in metal-poly(9,9-dioctylfluorene)-metal microcavities via conformational changes to the polymer backbone. Using thin-film samples containing increasing fractions of $ensuremath{beta}$-phase chain segments, a systematic study is reported for the mode characteristics and resulting light emission properties of cavities containing two distinct exciton subpopulations within the same semiconductor. Ultrastrong coupling for disordered glassy-phase excitons is observed from angle-resolved reflectivity measurements, with Rabi splitting energies in excess of 1.05 eV (more than $30%$ of the exciton transition energy) for both TE- and TM-polarized light. A splitting of the lower polariton branch is then induced via introduction of $ensuremath{beta}$-phase excitons and increases with their growing fraction. In all cases, the photoluminescence emanates from the lowermost polariton branch, allowing conformational control to be exerted over the emission energy and its angular variation. Dispersion-free cavities with highly saturated blue-violet emission are thus enabled. Experimental results are discussed in terms of the full Hopfield Hamiltonian generalized to the case of two exciton oscillators. The importance of taking account of the molecular characteristics of the semiconductor for an accurate description of its strong coupling behavior is directly considered, in specific relation to the role of the vibronic structure." @default.
- W2891813088 created "2018-09-27" @default.
- W2891813088 creator A5030948098 @default.
- W2891813088 creator A5085430500 @default.
- W2891813088 date "2018-11-15" @default.
- W2891813088 modified "2023-10-18" @default.
- W2891813088 title "Conformational control of exciton-polariton physics in metal-poly(9,9-dioctylfluorene)-metal cavities" @default.
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- W2891813088 doi "https://doi.org/10.1103/physrevb.98.195306" @default.
- W2891813088 hasPublicationYear "2018" @default.
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