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STRONG AND ULTRASTRONG LIGHT-MATTER INTERACTIONS IN MULTILAYER OPTICAL ORGANIC NANOSTRUCTURES

Liu, Bin
http://rave.ohiolink.edu/etdc/view?acc_num=case151249322258619

Abstract Details

2018, Doctor of Philosophy, Case Western Reserve University, Physics.
Light-matter interactions in multilayer organic nanostructures give rise to an abundance of interesting phenomena, and provide a functional platform for useful optical devices with sophisticated designs via fine control of the optical properties of the constituent materials and the thicknesses of each layers. This thesis focuses on the theoretical and experimental study of linear and nonlinear optical (NLO) properties of multilayer organic nanostructures in order to characterize the interaction between light and matter within the multilayer structure from a fundamental point of view, and to improve the linear and NLO efficiency of layered devices for practical applications. Metallic Fabry-Perot cavities filled with organic materials, as a typical multilayer structure, demonstrate strong and ultrastrong light-matter interaction, where hybrid quantum states known as cavity polaritons are formed. Moreover, compared to strongly coupled exciton-photon cavities, double organic cavities exhibit interesting optical properties in the ultrastrong coupling regime, yielding a broken degeneracy of vacuum Rabi splittings due to breaking of the rotating wave approximation (RWA). For the NLO properties, resonant third-harmonic generation (THG) can be enhanced by cavity polariton states, and THG intensity is seen to be larger when the polariton state is more exciton-like. Two-dimensional (2D) perovskite-based planar photovoltaic cells, as another typical multilayer structure, exhibit greatly improved environmental stability and photostability under operating conditions comparing with their 3D counterparts. We have investigated and designed devices using optical modeling. The absorption in the photoactive layer can be enhanced due to light-matter interaction in multilayer structures by carefully designing the layer thicknesses. In addition, using a modi ed drift-diffusion model, charge-carrier recombination is studied, which limits to the device performance of modest-mobility perovskite solar cells, while depending on the layer thickness. Therefore, the thickness optimization is investigated considering both aspects, which guides device fabrication with high power-conversion efficiencies. Coextruded multilayered polymer lms containing a NLO chromophore, a new alignment strategy for NLO chromophore, are studied by the second-harmonic generation (SHG) technique, which give rise to a second-order nonlinear optical response.
Kenneth Singer (Advisor)
Rolfe Petschek (Committee Member)
Giuseppe Strangi (Committee Member)
Clemens Burda (Committee Member)
Optics; Physics

Recommended Citations

Citations

  • Liu, B. (2018). STRONG AND ULTRASTRONG LIGHT-MATTER INTERACTIONS IN MULTILAYER OPTICAL ORGANIC NANOSTRUCTURES [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case151249322258619

    APA Style (7th edition)

  • Liu, Bin. STRONG AND ULTRASTRONG LIGHT-MATTER INTERACTIONS IN MULTILAYER OPTICAL ORGANIC NANOSTRUCTURES. 2018. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case151249322258619.

    MLA Style (8th edition)

  • Liu, Bin. "STRONG AND ULTRASTRONG LIGHT-MATTER INTERACTIONS IN MULTILAYER OPTICAL ORGANIC NANOSTRUCTURES." Doctoral dissertation, Case Western Reserve University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case151249322258619

    Chicago Manual of Style (17th edition)

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