This talk will describe new classes of optical modes that can provide feedback for plasmonic lasing. First, we will discuss how quasi-propagating modes supported by plasmonic nanoparticle lattices can be used to facilitate lasing over a continuous range of discrete angles and wavelengths if the modal gain of the material is high enough. Next, we will discuss the unique lasing beam profiles and polarization states that can emerge from solid-state gain materials combined with Bravais-lattice and moiré-lattice nanocavities. Finally, we will describe prospects for ultra-low threshold lasing at room temperature based on polaritons.
Photonic materials that derive their properties from periodicity can show analogous properties to their electronic counterparts. However, the special scattering properties of plasmonic nanoparticle lattices offer prospects for exceptional optical properties that cannot be found in electronic materials. This talk will describe two examples of extraordinary light scattering: (1) direct observation of photonic Brilluoin zone edges; and (2) ultra-long-range coupling between plasmonic nanoparticle lattices. Using dye molecules as local dipole emitters to excite and probe the optical modes, we will discuss how high-order Brilluoin edges, high-symmetry points, and moiré effects in plasmonic lattices can be revealed by directional lasing emission.
This talk will discuss current advances and future prospects in manipulating light at the nanoscale by plasmonic nanoparticle lattices. These meta-materials support collective hybrid resonances with both light scattering and localization properties. First, we will describe the expanded scope of plasmonic lattices based on exquisite tuning of topological symmetries and nanoparticle materials. Next, we will highlight how the nanoscale cavities combined with quantum emitters show unprecedented nano-lasing properties. Finally, we will discuss how this platform is opening new opportunities in imaging, strong coupling, and photoelectrocatalysis.
Band structures engineering of periodic optical structures enables the control of light propagation and localization. Although photons trapped inside 2D lattices can be described within the first Brillouin zone in reciprocal space, the wavevectors of scattered photons outside the lattice are limited by the 3D light cone, which depicts the free-photon dispersion in the surroundings. Because plasmonic nanoparticle lattices show unique dual properties of light trapping and strong scattering, this material platform is promising for investigations of radiative losses. This talk describes how light-cone surface lattice resonance (SLRs) from plasmonic nanoparticle lattices allow the observation of radiated electromagnetic fields. We theoretically predicted the angular distributions of the radiated fields, and experimentally probed the light-cone SLR modes by in-plane lasing emission. These results provide a nanolaser design strategy to achieve tunable lasing colors by lattice rotation.
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.
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.
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.
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