Evidence for braggoriton excitations in opal photonic crystals infiltrated with highly polarizable dyes

Eradat, Nayer; Sivachenko, Andrey; Raǐkh, M. É.; Vardeny, Z. Valy; Zakhidov, Anvar A.; Baughman, Ray H.

doi:10.1063/1.1479197

Cited by 27 publications

(14 citation statements)

References 22 publications

(37 reference statements)

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“…A complicated reflectivity line shape has been reported in dye infiltrated opals and attributed to braggoritons, 39 i.e., excitations due to the interaction of excitons and coherent Bragg diffracted photons. Even though we cannot definitively exclude the role of such light matter interaction mechanisms for our samples, we notice that Braggoritons have been unambiguously observed when a very sharp excitonic absorption is tuned over a broader photonic stop band for a thick opal 39,40 and no sigmoidal feature has been predicted in that case. 41 In AuNP doped opals, all spectral features due to surface plasmon are instead very broad.…”

Section: Resultsmentioning

confidence: 99%

Light Localization Effect on the Optical Properties of Opals Doped with Gold Nanoparticles

et al. 2008

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Polystyrene artificial opals having both different microsphere diameters and gold nanoparticles (AuNP) doping levels have been prepared and their spectroscopic characterization has been performed. Reflectance spectra of doped opals show a red shift of the photonic band gap and a reduction of its width and intensity upon increasing AuNP doping level, but they do not show any direct evidence of AuNP plasmon resonance. Transmittance spectra of the same samples recorded on the same spot area show, instead, a doping level dependent line shape. For the highest doping level a complicated sigmoidal line shape due to the overlap of broad AuNP absorption and photonic crystal stop band is observed. This unusual effect is accounted for by considering the localization of standing electromagnetic waves within both the microspheres and the interstices where the AuNP are embedded.

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Section: Resultsmentioning

confidence: 99%

Light Localization Effect on the Optical Properties of Opals Doped with Gold Nanoparticles

et al. 2008

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“…It should be noted that the developed theory with M → ∞ can be applied for the study of photonic crystals infiltrated with dye aggregates periodically distributed in the space and characterized by a certain resonance frequency of optical transitions, see 18 and references therein. The theory can be applied as well for the calculation of the dispersion of exciton-polaritons in resonant two-dimensional photonic crystals, e.g., in periodic arrays of cylinders A embedded into the matrix B.…”

Section: Resultsmentioning

confidence: 99%

Resonant three-dimensional photonic crystals

Ivchenko

Poddubny

2006

Phys. Solid State

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We have developed a theory of exciton-polariton band structure of resonant three-dimensional photonic crystals for arbitrary dielectric contrast and effective mass of the exciton that is excited in one of the compositional materials. The calculation has been carried out for a periodic array of spheres embedded in a dielectric matrix. It has been shown that the position of the lower branches of the polariton dispersion curve monotonously depends on the exciton effective mass and is determined by the coupling of light with the first few states of the mechanical exciton quantum confined inside each sphere. Particularly, we have studied the role of excitonic effects on the photonic-crystal band gap along the [001] direction of the Brillouin zone and presented an analytic description of the polariton dispersion in terms of the two-wave approximation.

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“…Dyes infiltrated in opals have served to demonstrate that intragap propagation is possible through excitations created by a highly polarizable medium with resonant frequency coupled to the PC. [189] These excitations are formed due to interaction between the (opal) Bragg gap and the (dye) polariton gap. As a result the Bragg reflectivity plateau splits into two peaks, with a transmission spectral region in between.…”

Section: Infiltrated Opalsmentioning

confidence: 99%

Materials Aspects of Photonic Crystals

López¹

2003

Advanced Materials

916

537

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Photonics, the technology of photons (as electronics is the technology of electrons), promises to be the new century's driving force in the advancement of, mainly but not only, information technology, such as communications and computing. This technology was initiated with the advent of lasers and optical fibers that, for various reasons, embody the best choice of source and channel of the information carrier: the photon. If the parallel with electronics is to be further pursued, one soon realizes that many more components are needed not only in the transport section of the technology but also, and principally, in the logic section: signal processing. An answer is promised to many of these demands by the potentiality of the new photonics era: photonic bandgap (PBG) materials, otherwise known as photonic crystals (PCs). In the present review a general perspective is presented on the state of the art in PC technology providing a broad audience‐oriented description of fundamentals and properties.

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Evidence for braggoriton excitations in opal photonic crystals infiltrated with highly polarizable dyes

Cited by 27 publications

References 22 publications

Light Localization Effect on the Optical Properties of Opals Doped with Gold Nanoparticles

Light Localization Effect on the Optical Properties of Opals Doped with Gold Nanoparticles

Resonant three-dimensional photonic crystals

Materials Aspects of Photonic Crystals

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