Shaping and enhancing the photoluminescence of halide perovskite quantum dots with plasmonic lattices

Abstract

Halide perovskite quantum dots (PeQDs) are characterized by a size-dependent emission spectrum and an intrinsic lack of preferential emission directions. Thus, new means for shaping the typical Lambertian angular profile...

Light scattering by plasmonic disks and holes arrays: different or the same?

“…To conclude, we have suggested an intuitive and simple approach for designing regular arrays of NHs complementary to widely used arrays of NDs. Respective periodic structures with parameters obeying D h = √ 2P − D d and D h = P conditions demonstrate almost similar far-field properties, which may serve as a useful guide for the design of arrays of NHs for various applications including but not limiting to sensing [9][10][11][12][13][14][15][16], upconversion luminescence [17], lasing [18][19][20], focusing [5], photocatalysis [21], thermoplasmonics [22,23], filtering [24,25], hybrid [27] and plasmon-exciton [28] coupling, and nonlinear optics [26]. Respective comparison of nearfield properties [48,61,62] of NHs and NDs designed using this strategy are the subject of further comprehensive study.…”

“…Since the observation of extraordinary optical transmission in arrays of holes in Ag films [1] and its further theoretical [2] and experimental [3] elaboration, regular plasmonic nanostructures exhibiting resonant optical properties have been at the forefront of modern photonics. Arrays of nanoholes (NHs) in metal films, easily manufactured via focused ion beam milling [4,5], soft interference lithography [6], ionbeam planarization [7] or direct laser writing [8], have been employed in sensing [9][10][11][12][13][14][15][16], upconversion luminescence [17], lasing [18][19][20], focusing [5], photocatalysis [21], thermoplasmonics [22,23], filtering [24,25], nonlinear optics [26], hybrid [27] and plasmon-exciton [28] coupling. One of the major drawback of NH arrays from the theoretical point of view is the lack of closed-form analytical solutions for electromagnetic properties of such nanostructures: straightforward treatment only exists for single NHs [29][30][31][32] or for NH arrays perforated in perfect electric conductor (PEC) thin films.…”

Directional Amplified Photoluminescence through Large-Area Perovskite-Based Metasurfaces

“…26−28 To introduce a periodic structural pattern into otherwise flat, continuous thin films of perovskite nanocrystals, the most straightforward method is through depositing the colloidal nanocrystals onto a prestructured substrate. This approach was previously successfully employed to generate enhanced directional PL, 29,30 manufacturing nanolasers, 31−40 photodetectors, 41 and solar cells. 42,43 However, such an indirect patterning method lacks the possibility of creating more complex, multicomponent metasurfaces, provides suboptimal electromagnetic energy confinement, and relies on an elaborate substrate preparation.…”

“…To introduce a periodic structural pattern into otherwise flat, continuous thin films of perovskite nanocrystals, the most straightforward method is through depositing the colloidal nanocrystals onto a prestructured substrate. This approach was previously successfully employed to generate enhanced directional PL, , manufacturing nanolasers, − photodetectors, and solar cells. , However, such an indirect patterning method lacks the possibility of creating more complex, multicomponent metasurfaces, provides suboptimal electromagnetic energy confinement, and relies on an elaborate substrate preparation . At the same time, direct patterning through ultraviolet (UV) or electron beam lithography (EBL) increases the risks of material degradation. − Some of these approaches have been explored for the patterning of metal halide perovskites, yet they present various challenges, including fabrication on a large scale and material degradation during processing. , A more appealing, low-cost, and scalable approach implies direct patterning of perovskite thin films through confinement self-assembly, where the colloidal solution of perovskite nanocrystals (or their precursors that are further turned into a solid crystalline phase) is confined on the substrate by a structured stamp. ,− As such, hard silicon (Si) stamps or glasslike molds were successfully employed to create structured metasurfaces with improved crystallinity , for modifying the emission properties ,,− and for photovoltaic applications. − However, the use of hard stamps requires additional surface modification and operation at high pressure and temperature.…”