In this work, Au nanoparticle clusters are formed at nanoscale, covered by a polymer shell and decorated with CdS/CdSe QDs. The polymer layer serves as an insulator to prevent the fluorescence quenching. The variations in the density of photon states in similar disordered structures are analyzed through changes in the transition rates of the light emitters interacting with the hotspot regions. The localized surface plasmon modes are demonstrated to significantly alter the density of electromagnetic states with their unique characteristics at nanoscale, offering an alternative to sophisticated plasmonic devices to alter light-matter interaction.
In this work, a disordered medium, comprised of Rhodamine dye-doped phenol and Au nanoparticles in an optical waveguide, is used to realize transverse Anderson localization of light waves. The optical waveguide facilitates to suppress unwanted optical modes and produce just a single dominant Anderson mode. Through coupling into a particular Anderson localized cavity, the dye molecules' transition rate is determined to be increased to a factor of 7.6. This paves the way for future research to understand and utilize the transverse Anderson localized modes in a 3D random plasmonic medium to manipulate light−matter interaction.
In this work, light−matter interaction is explored in a hybrid device, consisting of a microfiber cavity and a plasmonic nanoparticle. Perovskite nanowires are embedded in the microcavity and cylindrical nanoholes are formed on the surface of the structure to facilitate generating a hybrid photonic-plasmonic resonator. A spherical gold nanoparticle with a diameter of 15 nm, coated with a 15 nm polymer layer, is placed inside one of the cylindrical nanoholes on the surface of the microdevice to interact the localized surface plasmons with the cavity’s mode field. The device enables extreme light localization through concurrently coupling the emitter’s light into the optical mode field and strong plasmonic field, causing a significant change in the localized density of the electromagnetic states. Time resolved experiments, based on a single photon counting technique, are performed and single-atom cooperativity parameters procedure is applied to determine the enhancement of the light−matter interaction in the presence of the plasmonic nanoparticle. Consequently, light-matter interaction enhances by a factor of 6.4 upon coupling of the Perovskite nanowire into the hybrid photonic-plasmonic mode.
In our work, transverse Anderson localization is introduced for the first time in a simple wedge-type optical waveguide, which is formed by a triangular air hole imbedded into a fused silica material via a conventional fiber drawing technique. The micro tube is filled with a polymeric medium consisting of fluorescent dye molecules and naturally formed air inclusions caused by the capillary effect to offer a scattering medium for photons to localize the interfered electromagnetic waves. Anderson localization is explored through various single modes at different emission wavelengths within the photoluminescence spectral bandwidth of dye molecules. The photonic design of the optical waveguide allows the guidance of a single Anderson localized mode and suppression of the other modes to enable investigation of the spontaneous emission rate of the emitters, which are principally coupled into a single Anderson localized mode. The physical mechanism behind the changes in the emission dynamics of the fluorescent emitters is investigated by the time-resolved spectroscopy, which is found to be on resonance dependent with a particular cavity mode. The fastest decay rate of the light emission from the excited dye molecules is attributed to be due to the photons that couple into the localized optical modes without any spectral detuning. The enhancement of the spontaneous emission rate by a factor of 2.2 is achieved as the majority of the photons are coupled into an Anderson localized mode. Thus, a simple wedge-type optical waveguide is demonstrated to provide an opportunity to enhance light-matter interaction and opens new avenues to understand the nature of the spontaneous emission dynamics of the fluorescent emitters that are trapped in quasi optical cavities.
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