Tesis Doctorado
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Browsing Tesis Doctorado by Author "Arias Contreras, Mauricio Andrés"
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Item Infrared cavity quantum electrodynamics with anharmonic oscillators in nanophotonics.(Universidad de Concepción, 2023) Arias Contreras, Mauricio Andrés; Delgado Hidalgo, Aldo; Herrera, FelipeThe characterization and manipulation of complex microscopic systems for applications in science and technology demands to have robust theoretical tools that guide the extraction of relevant information or complement such processes. In particular, condensed phase physics, which is in a blurry boundary between chemistry and quantum physics, requires several approximations due the high number of degrees of freedom present. Thereupon, achieving a satisfactory balance between a model with just the right amount of features and, hopefully, requiring low computational requirements represents a significant challenge. This is the reason why having minimal models to understand the fundamental physics of complex condensed phases, in organic or inorganic materials, particularly when subject to confined electromagnetic fields, is a valuable contribution, specially appreciated in chemical physics and quantum optics protocols. In this thesis we show an intensive exploration of the capabilities of a nonlinear mid-infrared semi empirical model for describing the coherent and incoherent dynamics of anharmonic dipoles coupled to a single harmonic mode of a cavity QED.We find that the intrinsic anharmonicity in the material spectrum is heralded to the near electric field of a nanoresonator. Depending on the classical driving intensity ratio with respect to losses, this mechanism allows for the control and modulation of the complex phase of an incident finite pulse to the resonator with respect to the scattered cavity field, which translates into a delay in the stationary temporal domain, even after the pump pulse has ended. This mechanism promises interesting applications in molecular infrared nanophotonics, where the intrinsic anharmonicities of the vibrational modes are well documented in the literature, and also because the light-matter system requires to be in weak coupling regime, increasing the prospects for its experimental realization using current nanophotonic technology. Moreover, we show that our approach is applicable to other non organic devices as intersubbands in multi-quantum wells (MQW’s), where the state–of–the–art in both material and optical parameters engineering, as well as the capability of having smaller N compared to molecular systems, promises stronger effects on the nonlinear phase modulation, which can be modified and even increased by adapted heterogeneities among the dipoles that introduce contributions from the dark manifold. We expect our model will help in the development of new infrared nanophotonic hardware for applications ranging from quantum control of materials to quantum information processing.