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Apparent Resonance Splitting in Self-Coupled Excitonic Systems
Avishek Sarbajna, Qitong Li, Dorte Rub{\ae}k Danielsen, Skyler Peitso Selvin, Duc Hieu Nguyen, Manh-Ha Doan, Peter B{\o}ggild, Mark L. Brongersma, S{\o}ren Raza
https://arxiv.org/abs/2508.11370

Apparent Resonance Splitting in Self-Coupled Excitonic Systems
Thin films of high-refractive-index excitonic materials enable self-coupling by simultaneously supporting intrinsic excitonic transitions and optical resonances. These optical resonances take the form of Fabry-Perot resonances in thick films and absorption resonances in ultrathin films placed on metallic substrates. Here, we investigate whether these optical resonances lead to true exciton-photon hybridization. Using far-field reflectance and spectrally resolved photocurrent measurements, we st…