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Impact of polydispersity on light propagation in colloidal photonic crystals
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View: Figures


Image of FIG. 1.
FIG. 1.

Three-dimensional arrays of particles with different polydispersity [] of (a) 0%, (b) 3%, and (c) 5%. Each array has the same lateral dimensions and total number of particles as a close-packed array comprising particles. Periodic boundary conditions are used in both lateral directions. In the simulation, moves were attempted for every particle.

Image of FIG. 2.
FIG. 2.

Optical properties of the three arrays shown in Fig. 1, computed with FDTD; the particles have a refractive index of 1.5 and are embedded in air.

Image of FIG. 3.
FIG. 3.

Changes in transmittance and total scattering with polydispersity in arrays generated with the simulated-packing and the random-disorder model. Every array comprised 4800 particles and had the same lateral dimensions. The reflectance, transmittance and scattering were averaged over a spectral window of , either at the center of the stop band, at frequency , or outside the stop band, at frequency .

Image of FIG. 4.
FIG. 4.

Comparison of the transmittance measured on a colloidal crystal and the transmittance computed on a perfect face centered cubic array of spheres and on arrays generated with the random-disorder model and the simulated-packing model, both with . All arrays had a thickness of 84 layers.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Impact of polydispersity on light propagation in colloidal photonic crystals