Hybrid systems based on porous silicon microcavities and quantum emitters (QEs) are of much interest in terms of both basic research and development of new hybrid photoluminescent (PL) materials to be used in photonic, optoelectronic, and sensing applications. In these systems, light-matter coupling is established, whose strength could be increased to achieve the strong coupling regime by enhancing the quality factor of the microcavity. Incorporation of plasmonic nanoparticles (PNPs) also promotes an increase in the coupling strength and establishment of the coupling regime via the formation of hierarchical plasmon-optical cavities. Here we present the results of a numerical study of hybrid systems comprising porous silicon microcavities and plasmonic arrays placed inside them. These hybrid systems enable hierarchical plasmon-optical coupling with exciton transitions in QEs embedded into a porous silicon microcavity. We used numerical simulations to estimate the critical parameters for achieving light-matter coupling, including the Purcell factor and expected field enhancement, as well as the spatial distribution of the electromagnetic field within the structure. We speculate that light-matter coupling between the PL of QEs and the hierarchical cavity mode is stronger than in a microcavity not containing PNPs.
Light-matter coupling between the molecular dipole transitions and a confined electromagnetic field provides the ability to control the fundamental properties of coupled matter. The use of tunable optical microcavities for electromagnetic field confinement allows one to affect the coupled state properties in a controllable manner, whereas the coupling strength in this system strongly depends on the transition dipole moment and a mode volume of the cavity. In this study we have demonstrated controllable emission of Rhodamine 6G organic molecules with relatively low and unoriented dipole moments in a strong coupling regime by placing them into a tunable Fabry-Perot microcavity.
It is known that development of optical sensors for explosives detection is currently of great interest. Among others sensors based on the luminescence quenching of conjugated polymers caused by photoinduced electron transfer have attracted considerable attention. Embedding such polymers into porous silicon (pSi) microcavity (MC) allows modify its luminescence spectrum and increase specific surface area and sensitivity of sensor. At the same time optimization of pSi MC structure and its mode of operation are important aspects of sensors design. This study presents the results of the structure and temperature optimization of pSi MC with embedded PPV derivatives polymers. The pSi MCs were fabricated using a standard electrochemical etching process. The luminescence spectra of polymers were drastically narrowed after embedding in pSi MC. It was experimentally found that optimal thickness of the front mirror is from 4 to 5 pairs of low and high porosity layers. The optimal thickness of the rear mirror is about 15 pairs of low and high porosity layers. We also discovered that temperature of pSi MC strongly influences on the rate of the polymer luminescence quenching under exposure to TNT vapors. In particular, it was shown that a decrease of MC temperature to 5° C leads to more than three times drop of quenching time. The obtained results can be applied for the design of optical sensors of explosives based on pSi MC.
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