This talk will describe how strongly coupled plasmonic nanoparticle arrays can support high-quality optical modes at high-symmetry points in their photonic band structure. These collective lattice excitations, often called surface lattice resonances (SLRs), show flat-banded modes whose mechanistic origins depend on the nature of the localized plasmon resonance of the constituent nanoparticles. Access to these high-symmetry modes is now possible because of advances in scalable nanofabrication processes.
Plasmon-based lasers and surface plasmon amplified spontaneous emission of radiation devices (spasers) have garnered significant attention since their prediction over a decade ago. Major advances have included subwavelength footprint sizes, room-temperature operation, far-field emission directionality, and understanding of the lasing mechanism. Notably, one simple architectural design for the plasmonic lasing cavity, nanoparticle lattices, has emerged as a powerful platform to achieve exquisite control over the coherent light. This talk will describe how tuning of the lattice symmetry and nanoparticle characteristics as well as the type of gain material can result in fine control over the wavelength, threshold, angle of emission direction, and polarization of the nano-lasing signals.
The fundamental study and realisation of practical devices for quantum nanophotonic systems stems from the development of hybridised devices, consisting of a single photon source and various other constituents, which aid in controlling light-matter interactions. Emitters hosted within hexagonal boron nitride (hBN) are such a source favoured for this role, owing to its high quantum efficiency, brightness, and robustness. In our work, we explore and demonstrate the integration of hBN emitters with plasmonics, in two distinct arrangements – gold nanospheres, and a gold plasmonic nanocavity array. The former involves the utilisation of an atomic force microscope (AFM) tip to precisely position gold nanospheres to within close proximity to the quantum emitters and observe the resulting emission enhancement and fluorescence lifetime reduction. A fluorescence enhancement of over 300% and a saturated count rate in excess of 5M counts/sec is achieved, emphasising the potential of this material for hybridisation. The latter arrangement involves the direct transfer of a gold plasmonic lattice on top of an emitter hosted within hBN, similarly, to achieve emission enhancement as well as a reduction in fluorescence lifetime and provides an approach for achieving scalable, integrated hybrid systems based on low-loss plasmonic nanoparticle arrays. Both these systems give promising solutions for future employment of quantum emitters in hBN for integrated nanophotonic devices and provide us insight into the complex photodynamics, which envelop the emitters hosted within the material.
Conference Committee Involvement (5)
Quantum Nanophotonic Materials, Devices, and Systems 2021
1 August 2021 | San Diego, California, United States
Quantum Nanophotonic Materials, Devices, and Systems 2020
24 August 2020 | Online Only, California, United States
Quantum Nanophotonic Materials, Devices, and Systems 2019
14 August 2019 | San Diego, California, United States
Quantum Nanophotonics 2018
20 August 2018 | San Diego, California, United States
7 August 2017 | San Diego, California, United States