Strongly Coupled Exciton–Surface Lattice Resonances Engineer Long-Range Energy Propagation

Abstract

Here, we provide the details of sample preparation, experimental set up, characterization of samples, and additional computational results. 1 CONTENTSSemiconductor quantum dot photoluminescence (PL) and absorption spectra 2 SQD/plasmon lattice sample preparation 3Atomic force microscopy images of the SQDs/plasmon lattice 4Semiconductor quantum dot number density (ρ) 5Comparison of PL splitting in the C 3 and R configurations 6Semiconductor Quantum dot density dependent Transmission and Pl spectra 7Experimental setup for distance-dependent PL spectra 8Photoluminescence (PL) map of the SQDs/plasmon lattice 9Distance dependence of the PL spectral splitting of the SQD/plasmon lattice 10Distance dependence of the PL intensity profile 11Propagation distances along the X and Y directions 13Additional coupled dipole results 14 Phenomenological cQED Model 16References 20QUANTUM DOT PHOTOLUMINESCENCE (PL) AND ABSORPTION SPEC-TRA To measure the semiconductor quantum dot (SQD) PL and absorption spectra, a SQD solution was prepared by dissolving cleaned SQDs in toluene. Figure S1 shows an absorption spectrum for a SQD solution, measured with a Perkin-Elmer UV-Vis spectrometer and the corresponding photoluminescence (PL) spectra, measured with a Perkin-Elmer fluorescence spectrometer.

Boosting Strong Coupling in a Hybrid WSe2 Monolayer–Anapole–Plasmon System

“…Strong coupling effects have been widely demonstrated in conventional semiconductor materials such as GaAs quantum dots, GaN and ZnO wide-bandgap semiconductors, and organic polymer materials. ,, However, under ambient conditions, the realization of strong coupling in these materials is challenging due to either exciton bleaching, the limited thermal stability of excitons or the strong localization effect of disordered potentials. ,,, The recent discovery of two-dimensional transition metal dichalcogenides (TMDCs) has opened new opportunities for addressing these downsides owing to their remarkable optical properties such as high excitation binding energy of approximately 100 meV, easy observation of excitonic effects at room temperatures, fixed vacuum field, and the presence of neutral and charge exciton resonances in the material. ,,,,,− The large transition dipole moments, direct bandgaps, high absorptivity, and narrow line widths are other advantages that make the monolayers of these TMDCs materials as ideal platforms for the realization of the exciton–polaritons. ,, Moreover, the locked spin and valley degrees of freedom of the monolayer TMDCs materials provide new opportunities for exploring valley polaritons and exhibit great potential for novel device architectures. ,,, Recently, the TMDCs excitons have been utilized to develop polaritons at room temperature through strong coupling between TMDCs and the various systems including distributed Bragg reflectors (DBRs), and vertical Fabry–Perot (FP) cavities. ,,,, However, such systems suffer from several drawbacks which adversely affect the field of exciton–polaritonics such as complicated fabrication processes, difficulty to engineer the mode or dispersion of the cavity, relatively rigid and bulky against postprocessing. , Hence, the investigation of new photonic structures to achieve strong coupling in the TMDCs materials is still necessary to facilitate the development of polariton-based devices. ,,, …”

Lattice Resonances Induced by Periodic Vacancies in Arrays of Nanoparticles

“…Furthermore, the collective character of lattice resonances and their extended nature makes them ideal candidates to provide an efficient long-range interaction between emitters placed near the array. This possibility has started to be explored to achieve collective emission [71,72], as well as long-range energy propagation [73].…”

Room-Temperature Coupling of Single Photon Emitting Quantum Dots to Localized and Delocalized Modes in a Plasmonic Nanocavity Array

“…Among the different types of cavities, plasmonic cavities are promising candidates to manipulate the single photon efficiency of a single CQD because of the ability to concentrate the optical field in nanoscale volume. − Although these cavities are quite lossy due to strong dissipation, these can, nevertheless, produce quantum entanglement between two quantum emitters coupled to these cavities. − The loss of these plasmonic cavities can be suppressed by generating plasmonic nanocavity arrays that support plasmonic surface lattice resonances , in the regime of strong coupling between the cavities. Plasmonic cavity arrays in the strong coupling regime can generate strongly delocalized modes as well as highly localized modes due to the individual cavities . The lattice modes were utilized earlier to generate strong light–matter interactions, directional emission, and lasing for high density of emitters. − Plasmonic cavity arrays have also been used previously to enhance single-photon emission by integrating with 2D materials like hBN. , However, while 2D materials have several advantages as SPEs, they do not have the high quantum efficiency or the broad spectral tunability that CQDs have.…”