Reflectivity of 88% for four-period hybrid Bragg mirror from spin coating process

DeSilva, L. Ajith; Gadipalli, R. R.; Donato, Anthony A.; Bandara, T M W J

doi:10.1016/j.ijleo.2017.11.048

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…These polymers cover a relatively limited refractive-index range and, thus, lead to low refractive-index contrast between DBR layers. While the use of nanocomposites of an inorganic species, such as TiO 2 , SiO 2 , or CdS nanoparticles blended with a polymer matrix, increases the refractive-index contrast between DBR layers, [44,45] it also typically leads to optical loss and, thus, a reduced microcavity performance. The molecular hybrid employed here circumvents these issues.…”

Section: Discussionmentioning

confidence: 99%

Simple and Versatile Platforms for Manipulating Light with Matter: Strong Light–Matter Coupling in Fully Solution‐Processed Optical Microcavities

Strang,

Quirós‐Cordero,

Grégoire

et al. 2023

Advanced Materials

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Planar microcavities with strong light–matter coupling, monolithically processed fully from solution, consisting of two polymer‐based distributed Bragg reflectors (DBRs) comprising alternating layers of a high‐refractive‐index titanium oxide hydrate/poly(vinyl alcohol) hybrid material and a low‐refractive‐index fluorinated polymer are presented. The DBRs enclose a perylene diimide derivative (b‐PDI‐1) film positioned at the antinode of the optical mode. Strong light–matter coupling is achieved in these structures at the target excitation of the b‐PDI‐1. Indeed, the energy‐dispersion relation (energy vs in‐plane wavevector or output angle) in reflectance and the group delay of transmitted light in the microcavities show a clear anti‐crossing—an energy gap between two distinct exciton‐polariton dispersion branches. The agreement between classical electrodynamic simulations of the microcavity response and the experimental data demonstrates that the entire microcavity stack can be controllably produced as designed. Promisingly, the refractive index of the inorganic/organic hybrid layers used in the microcavity DBRs can be precisely manipulated between values of 1.50 to 2.10. Hence, microcavities with a wide spectral range of optical modes might be designed and produced with straightforward coating methodologies, enabling fine‐tuning of the energy and lifetime of the microcavities‘ optical modes to harness strong light–matter coupling in a wide variety of solution processable active materials.

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Section: Discussionmentioning

confidence: 99%

Simple and Versatile Platforms for Manipulating Light with Matter: Strong Light–Matter Coupling in Fully Solution‐Processed Optical Microcavities

Strang,

Quirós‐Cordero,

Grégoire

et al. 2023

Advanced Materials

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“…Until a few years ago, in most cases the nonvolatile solute was a polymer, but recently the spin-casting of suspensions of nanosize objects, such as nanoparticles, nanorods, and nanowires, , in volatile liquids has also been used to produce thin layers of nanosize objects on solid substrates. Thus, for instance ordered monolayers − and multilayers , have been prepared with special optical properties. ,− The particle coverage is an important system parameter which is adjusted by the processing parameters (initial concentration, rotational speed, solvent, etc.). Until now, the processing conditions for obtaining a certain desired particle layer coverage from a certain particle/liquid dispersion were derived empirically by trial and error .…”

Section: Introductionmentioning

confidence: 99%

Controlled Deposition of Nanosize and Microsize Particles by Spin-Casting

et al. 2019

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The deposition of nanosize and microsize spherical particles on planar solid substrates by hydrodynamic-evaporative spin-casting is studied. The particles are dispersed in a volatile liquid, which evaporates during the process, and the particles are finally deposited on the substrate. Their coverage, Γ, depends on the processing parameters (concentration by weight, particles size, etc.). The behavior of the particles during the spin-casting process and their final Γ values are investigated. It is found that for up to particle diameters of a few micrometers, particle deposition can be described by a theoretical approach developed for the spin-casting of polymer solutions (Karpitschka, S.; Weber, C. M.; Riegler, H. Chem. Eng. Sci. 2015 , 129 , 243–248. Danglad-Flores, J.; Eickelmann, S.; Riegler, H. Chem. Eng. Sci. 2018 , 179 , 257–264). For large particles, this basic theory fails. The causes of this failure are analyzed, and a corrected, more general theoretical approach is presented. It takes into account particle size effects as well as particle sedimentation. In summary, we present new insights into the spin-cast process of particle dispersions, analyze the contributions affecting the final particle coverage, and present a theoretical approach which describes and explains the experimental findings.

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