Observation of cavity polaritons in a metal-mirror Fabry-Pérot microcavity containing liquid-crystalline semiconductor based on perylene bisimide units

Kani, Nobutaka; Suzuki, Makoto; Nishiyama, Koji; Nakanishi, Shunsuke; Funahashi, Masahiro; Tsurumachi, Noriaki

doi:10.1103/physreve.100.032701

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…Here, we investigate aligned thin films of the well-known n-type semiconductor and fluorophore PDIF-CN 2 ( N , N ′-bis(1 H ,1 H -perfluorobutyl)-dicyanoperylene-3,4:9,10-bis(dicarboximide)) integrated in silver-clad Fabry–Pérot microcavities. PDIF-CN 2 is a member of the large family of perylene diimides (PDI), whose strong optical transitions and high photostability have led to their application in various exciton–polariton devices including polariton lasers. ,− Several PDIs can form J-aggregates in the solid state, whose sharp absorption bands and strong photoluminescence (PL) can be especially useful for polaritonic applications. , PDIF-CN 2 combines these advantageous properties with the potential for high molecular alignment in thin films and good charge transport. ,, When deposited as an aligned thin film by zone-casting, PDIF-CN 2 exhibits molecular packing with both J-like and H-like aggregate behavior depending on light polarization …”

Section: Introductionmentioning

confidence: 99%

Polarization-Dependent Strong and Weak Light-Matter Coupling in Aligned Perylene Diimide Thin Films

Herrmann,

Hertzog,

Mischok

et al. 2024

ACS Appl. Opt. Mater.

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Alignment of organic molecules in Fabry−Peŕot microcavities can lead to increased light-matter coupling and polarization-dependent formation of exciton−polaritons. So far, only a few cases of polarization-dependent strong-coupling in aligned and birefringent organic systems have been investigated with different interpretations of the observed properties. Here, we create highly aligned thin films of the well-known perylene diimide fluorophore and n-type semiconductor PDIF-CN 2 by zone-casting and integrate them in metal-clad Fabry−Peŕot microcavities. The obtained thin-film polymorph exhibits both J-like and H-like aggregate behavior, depending on polarization. Using angleresolved and polarization-selective reflectivity and photoluminescence measurements of the cavities, we analyze their response to different light polarization and propagation directions and find two orthogonally polarized optical systems with different coupling strengths. These two systems, one strongly coupled and one weakly coupled, are nearly independent of the incident light wavevector orientation and polarization due to the birefringent properties of the film. These contrasting cavity properties in combination with the good charge transport in PDIF-CN 2 are highly interesting for polarization-selective photodetectors.

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Section: Introductionmentioning

confidence: 99%

Polarization-Dependent Strong and Weak Light-Matter Coupling in Aligned Perylene Diimide Thin Films

Herrmann,

Hertzog,

Mischok

et al. 2024

ACS Appl. Opt. Mater.

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“…[29,30] As archetypical anisotropic systems, liquid crystalline semiconductors have been attracting a strong interest for organic electronic and photonic devices. [31][32][33][34][35][36][37][38][39][40] These materials offer the advantage of controlling the order in bulk and at interfaces at all length scales from molecular to macroscopic distances. Among the various liquid crystalline materials, discotic liquid crystal (DLC) received a particular attention for optoelectronic applications.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Light–Matter Interaction and Polariton Relaxation by the Control of Molecular Orientation

Ishii

Bencheikh

Forget

et al. 2021

Advanced Optical Materials

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the interaction between the exciton and a resonant electromagnetic mode gives rise to hybrid excited states which are characterized by an energy level splitting. These states form the upper polariton (UP) and the lower polariton (LP) branches, with a minimum splitting called the Rabi splitting. [1,2] For Wannier-Mott excitons in group III-V semiconductors, the Rabi splitting is typically in the 5-10 meV range. [3][4][5][6][7] On the other hand, for Frenkel excitons in organic microcavities, the Rabi splitting can be 10-100 times larger than the splitting in the inorganic microcavities due to their large binding energy. [8][9][10][11] The large Rabi splitting achievable in organic microcavities allows for strong coupling and polariton BEC to be realized at room temperature. [12][13][14][15][16]18,19] Very recently, important advances such as the development of strongly coupled light-emitting field-effect transistors based on electrical pumping of exciton-polaritons at room temperature have been demonstrated, providing a route toward quantum optoelectronic applications. [17] However, so far, Exciton-polaritons, in which the electronic state of an excited organic molecule and a photonic state are strongly coupled, can form a Bose-Einstein condensate (BEC) at room temperature. However, so far, the reported thresholds of organic polariton BECs under optical excitation are as high as P th = 11-500 μJ cm -2 . One route toward lowering the condensation threshold is to increase the Rabi energy by aligning the molecular transition dipole moments. In this report, it is demonstrated that control of the orientation of a perylene-based discotic dye, which is able to self-organize in mesogenic columnar structures, can significantly enhance exciton-photon interaction and polariton relaxation rate in optical cavities. These results show the importance of the molecular orientation for strong light-matter interactions and provide a promising strategy toward the realization of an organic low threshold polariton BEC system and electrically driven organic polariton BEC.

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Observation of cavity polaritons in a metal-mirror Fabry-Pérot microcavity containing liquid-crystalline semiconductor based on perylene bisimide units

Cited by 2 publications

References 29 publications

Polarization-Dependent Strong and Weak Light-Matter Coupling in Aligned Perylene Diimide Thin Films

Polarization-Dependent Strong and Weak Light-Matter Coupling in Aligned Perylene Diimide Thin Films

Enhanced Light–Matter Interaction and Polariton Relaxation by the Control of Molecular Orientation

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