Hybrid Loss‐Compensated Plasmonic Device

Abstract

in them are essential to explore the plasmonic behavior at various interfaces. Dielectric can be as inorganic and organic; its selection depends on their attributes. Presently organic materials are particularly attractive due to their long exciton lifetime which makes strong modal coupling in interaction with SPP probable. [4] To achieve strong coupling, organic material ought to possess limited transition linewidth [5] like using J-aggregate molecules at plasmonic interfaces. [6] But J-aggregate molecules require special environmental prerequisites to function properly and maintain stable interaction. In this study, we used small florescent molecule to investigate the strong modal coupling at the organic/ plasmonic interface. We focus on the strong modal coupling of plasmonic microcavity using florescent organic material, EY51 (Rubrene-like), in dielectric medium of plasmonic microcavity. The introduction of an active medium has effectively introduce a loss-compensated channel in the microcavity. We believe the interaction of active medium cavity and plasmonic nanostructure has generated a new plasmonic system that can open up a new degree to control modal coupling, analogous to the modal coupling control in parity-time symmetry system; we observed anticrossing with large Rabi-analog splitting at cavity mode-SPP coupling in large area hybrid plasmonic microcavity. We also investigated the luminescence intensity which acts as loss-compensation impact on the coupling strength of cavity. In addition, the photoluminescence (PL) emission measurement was carried out for plasmonic and photonic microcavity which acquired higher intensity of PL emission in the plasmonic cavity than that of photonic. The device was fabricated with conventional photolithography to provide the required practicality and cost-efficiency of mass production for various applications. [7] TheoryThe light-matter interaction at the plasmonic microcavity can be broadly described by the following Hamiltonian [8] cav c av spp s ppwhere ω cav and ω spp are, respectively, the resonant frequencies of the cavity mode and SPP mode, Γ cav and Γ spp represent the Here it is studied how the active medium affects the Rabi-analog splitting when an active plasmonic microcavity mode is coupled to a surface plasmon polariton mode. The incorporation of Rubrene-like molecules in the plasmonic microcavity results in stronger modal coupling. Anticrossing is observed with a large Rabi-analog splitting energy of 280 meV in the strong coupling regime. The active medium contributes to the split enhancement through channeling more energy toward the coupling. The variation of photoluminescence emission and exciton-cavity mode coupling from the hybrid plasmonic microcavity are also measured. This work shows that by introducing an active medium in the microcavity, mode coupling between microcavity and surface plasmon polariton can be enhanced and the hybrid plasmonic device exhibits paritytime symmetry characteristics.

Tunable Multimode Plasmon–Exciton Coupling for Absorption-Induced Transparency and Strong Coupling

“…4 Since then, a strong coupling regime has been achieved through interactions among a variety of plasmonic structures and organic molecules 5−12 and has been widely applied in many fields, such as sensing, 13,14 surface-enhanced Raman scattering 15,16 and nanolasing. 17,18 Several studies have clearly demonstrated that the Rabi splitting energy is positively proportional to N V / where N is the molecular quantity and V is the dimension of vacuum field in hybrid systems. 19,20 Another fancy phenomenon induced by the plasmonic structure is extraordinary optical transmission (EOT), which makes the transmission efficiency above the conventional unit one based on the surface of a periodically patterned metal film, first reported by Ebbesen et al in 1998.…”

“…In 2004, Bellessa et al first achieved a strong coupling regime between SPPs and organic molecules at room temperature . Since then, a strong coupling regime has been achieved through interactions among a variety of plasmonic structures and organic molecules − and has been widely applied in many fields, such as sensing, , surface-enhanced Raman scattering , and nanolasing. , Several studies have clearly demonstrated that the Rabi splitting energy is positively proportional to where N is the molecular quantity and V is the dimension of vacuum field in hybrid systems. , …”