Undergraduate Thesis Or Project


The interaction of bulk heterojunction donor/acceptor blends with polaritonic state creation in organic crystalline films Public Deposited

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  • We explore the interactions between charge transfer exciton states (CTEs) and an optical microcavity by testing the effects that cavity resonance has on the CTEs and if CTEs can be coupled with a photon to create quasiparticles known as polaritons. Exciton polaritonics is becoming a booming area of research mainly due to the variety of intriguing consequences of these quasiparticles. Here, we specifically look into how the environment can affect the creation of exciton polaritons in organics. To do this, we fabricated optical microcavities and placed a thin film of a functionalized Anthradithiophene derivative inside the cavity. The transmitted photoluminescence was measured at varying angles off of the cavity’s surface normal to gather spectra. Using the maximum energies of these peaks, we model the energies with respect to angle of detection. In this way, one can demonstrate Rabi splitting, thus verifying the existence of polaritons. Our data shows no Rabi splitting in a cavity that matches resonances with the CTEs, but that polaritons can form with the Frenkel exciton state when cavity resonance matches that of the Frenkel exciton. The combination of these phenomena is intriguing as it offers pathways to reduce CTEs creation in devices as well as the possibility of discovering a new form of polariton.
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