Angle-Resolved Reflectivity and Self-Activated Luminescence of 3D Photonic Crystals

Romanelli, Marco; Vion, Céline; Barthou, Carlos; Bénalloul, P.; Frigério, Jean‐Marc; Maître, Agnès; Nga, Pham Thu; Cuong, Pham Thai; Грузинцев, А. Н.; Redkin, Arkadi

doi:10.3938/jkps.52.1589

Cited by 4 publications

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“…The decrease in the transmission for λ ≤ 350 nm is due to the cutoff in transmission of matrix/substrate of the fluco. We fit the angle dependent position of the reflection peaks with the appropriate Bragg relation 15 λ max = 2$\sqrt {2/3} \, D \sqrt {n^2 - {\rm sin} ^2 \phi } $ to independently extract the sphere diameter D = 259 nm and average opal refractive index n OP = 1.38, which both agree well with the above data (Fig. 5).…”

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confidence: 72%

Efficient light trapping in a fluorescence solar collector by 3D photonic crystal

Knabe

Soleimani

Markvart

et al. 2010

Physica Rapid Research Ltrs

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Fluorescence collectors [1,2] provide efficient concentration and spectral dispersion of solar light for the conversion in multispectral solar cells such as tandem or triple cells [3,4] that allow reduction of cost and increase in efficiency [5][6][7]. One of the principle drawbacks of fluorescence collectors (flucos) consist in the loss of photons through the escape cone resulting from the lack of total reflection due to the contrast in refractive indices of fluco and its environment. This loss can be reduced by overcoating the illuminated (entrance) side with an angularly selective filter. Such selective filters prevent at least some luminescence photons in any type of absorber, e.g. fluco or semiconductor from escaping through the collector front side [8] and thus increase the internal photon density.By sufficient absorption and reemission in the fluco this higher flux is redistributed isotropically in the solid angle 4π and leads to a higher photoexcited state in the fluco which is attributed to an increase in chemical potential of the photon field [9]. This redistribution into 4π, analogously with the original isotropic emission, rises the photon flux towards the fluco edges as well where usually solar cells are attached [1,7] which benefit from the rise by a higher chemical potential of the electron-hole ensem-ble, equivalent with larger separation of quasi-Fermi levels [10][11][12], however the non-negligible reflection of the opal at λ ≤ 600 nm [13] may overcompensate the beneficial effect.We have performed spectral and angle dependent analyses of light emission from the illuminated fluorescence collector with and without selective filter at the light entrance side. We observe distinct differences in the spectral and angle dependent transmission and reflection spectra associated with the effect of the selective filter. Figure 1 (online colour at: www.pss-rapid.com) Spectral absorption and emission of a rodamine 6G doped fluorescence collector at normal incidence.The escape of photons from a fluorescence collector is substantially reduced by the addition of a 3D photonic crystal which is geometrically designed for the emission wavelengths of the collector. We analyze angle dependent spectral transmission and reflection of the opal and prove the blocking effect by recording the angle dependence of the spectral fluorescence from the collector with and without the opal. By comparison of both photon fluxes a reduction of the emission in the appropriate ranges of wavelength and angle by a factor > 10 is observed. For photovoltaic applications an increase in the internal photon density of the collector and likewise in the fluorescence photon flux fed to a solar cell can be expected, which might be overcompensated by the non-negligible reflection of the opal.

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confidence: 72%

Efficient light trapping in a fluorescence solar collector by 3D photonic crystal

Knabe

Soleimani

Markvart

et al. 2010

Physica Rapid Research Ltrs

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“…For an opal, the periodic three-dimensional grating actually relies on an ensemble of contacted spheres, but the principle of a geometric condition governing the direction of a Bragg diffraction still applies. The standard Bragg condition kl = 2a cos(q), with k an integer, a the distance between successive planes, and q the incidence angle, should however include the effect of propagation in the opal as an heterogeneous medium, so that a modified equation [6] is often applied to find the wavelength lmax for an opal [12][13]24]: k l max /D = 2. (2/3) 1/2 (n² eff -sin²q) 1/2 (5) Eq.…”

Section: Bragg Reflection and Fabry-perot Oscillationsmentioning

confidence: 99%

“…This crude model has even been used to describe antireflection properties of a single layer opal [22,23]. It is actually often combined with the geometrical periodicity of the opal crystalline arrangement [6,[11][12][13][24][25] in order to predict a peak of reflectivity in analogy with a Bragg diffraction peak, so that the "effective index" allows to determine the optical periodicity inside the opal. By adjusting the model to experiments performed under various incidences, a refined estimate of the sphere diameter and/or of the sphere index (i.e.…”

Section: Introductionmentioning

confidence: 99%

Optics of an opal modeled with a stratified effective index and the effect of the interface

Maurin¹,

Moufarej²,

Laliotis³

et al. 2015

J. Opt. Soc. Am. B

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International audienceReflection and transmission for an artificial opal are described through a model of stratified medium based upon a one-dimensional variation of an effective index. The model is notably applicable to a Langmuir-Blodgett type disordered opal. Light scattering is accounted for by a phenomenological absorption. The interface region between the opal and the substrate -or the vacuum- induces a periodicity break in the photonic crystal arrangement, which exhibits a prominent influence on the reflection, notably away from the Bragg reflection peak. Experimental results are compared to our model. The model is extendable to inverse opals, stacked cylinders, or irradiation by evanescent wave

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“…Robust 5 ϫ 5 ϫ 0.5 mm 3 samples were obtained ͑Ϸ2000 layers͒. 27,28 Figure 1 presents the opal band diagram calculated numerically by a direct computation of the eigenstates and eigenvalues of Maxwell's equations ͑using a plane wave basis͒, 29 showing a photonic pseudogap at the L point of the photonic Brillouin zone.…”

Section: Opals Characterizationmentioning

confidence: 99%

Manipulating emission of CdTeSe nanocrystals embedded in three-dimensional photonic crystals

Vion

Barthou

Bénalloul

et al. 2009

Journal of Applied Physics

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We report experimental and theoretical results on the photoluminescence of CdTeSe nanocrystals, embedded in a silica opaline structure by infiltration of a highly diluted solution. Strong modification of emission diagrams of embedded nanocrystals have been observed in good agreement with theoretical models. At macroscopic scale, we measured the difference of nanocrystals emission lifetime embedded either in an opal for which the emission is in the gap, or in an opal of smaller balls diameter for which the emission is outside the gap. The photonic bandgap effect leads to a lifetime increase of the order of 10%. These lifetime variations are shown to be in good agreement with the calculated local density of states modification due to the pseudogap.

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Angle-Resolved Reflectivity and Self-Activated Luminescence of 3D Photonic Crystals

Cited by 4 publications

References 0 publications

Efficient light trapping in a fluorescence solar collector by 3D photonic crystal

Efficient light trapping in a fluorescence solar collector by 3D photonic crystal

Optics of an opal modeled with a stratified effective index and the effect of the interface

Manipulating emission of CdTeSe nanocrystals embedded in three-dimensional photonic crystals

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