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Novel hybrid organic/inorganic 2D quasiperiodic PC: from diffraction pattern to vertical light extraction.

Petti L, Rippa M, Zhou J, Manna L, Zanella M, Mormile P - Nanoscale Res Lett (2011)

Bottom Line: Scanning electron microscopy, far field diffraction and spectra measurements are used to characterize the experimental structure.The vertical extraction of the light, by the coupling of the modes guided by the PQC slab to the free radiation via Bragg scattering, consists of a narrow red emissions band at 690 nm with a full width at half-maximum (FWHM) of 21.5 nm.The original characteristics of hybrid materials based on polymers and colloidal NRs, able to combine the unique optical properties of the inorganic moiety with the processability of the host matrix, are extremely appealing in view of their technological impact on the development of new high performing optical devices such as organic light-emitting diodes, ultra-low threshold lasers, and non-linear devices.PACS: 81.07.Pr Organic-inorganic hybrid nanostructures, 81.16.-c Methods of nanofabrication and processing, 42.70.Qs Photonic band-gap materials.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Cybernetics "E, Caianiello" of CNR, Via Campi Flegrei 34, 80072 Pozzuoli, Italy. L.petti@cib.na.cnr.it.

ABSTRACT
Recently, important efforts have been dedicated to the realization of a fascinating class of new photonic materials or metamaterials, known as photonic quasicrystals (PQCs), in which the lack of the translational symmetry is compensated by rotational symmetries not achievable by the conventional periodic crystals. As ever, more advanced functionality is demanded and one strategy is the introduction of non-linear and/or active functionality in photonic materials. In this view, core/shell nanorods (NRs) are a promising active material for light-emitting applications. In this article a two-dimensional (2D) hybrid a 2D octagonal PQC which consists of air rods in an organic/inorganic nanocomposite is proposed and experimentally demonstrated. The nanocomposite was prepared by incorporating CdSe/CdS core/shell NRs into a polymer matrix. The PQC was realized by electron beam lithography (EBL) technique. Scanning electron microscopy, far field diffraction and spectra measurements are used to characterize the experimental structure. The vertical extraction of the light, by the coupling of the modes guided by the PQC slab to the free radiation via Bragg scattering, consists of a narrow red emissions band at 690 nm with a full width at half-maximum (FWHM) of 21.5 nm. The original characteristics of hybrid materials based on polymers and colloidal NRs, able to combine the unique optical properties of the inorganic moiety with the processability of the host matrix, are extremely appealing in view of their technological impact on the development of new high performing optical devices such as organic light-emitting diodes, ultra-low threshold lasers, and non-linear devices.PACS: 81.07.Pr Organic-inorganic hybrid nanostructures, 81.16.-c Methods of nanofabrication and processing, 42.70.Qs Photonic band-gap materials.

No MeSH data available.


Related in: MedlinePlus

Spectrally integrated light intensity characteristics of the realized hybrid nanostructure. Measured emission profile of the fabricated sample as detected normally from the sample surface using a multimode fiber, a CCD imaging telescope, and a CCD-based spectroradiometer. A white light was introduced from an edge of the glass and was propagating inside the glass. The emission profile was measured along the ΓX direction of the octagonal QC. The main peak at 690 nm corresponds to the apparent resonant mode of the PC with a narrow FWHM of 21.5 nm.
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Figure 6: Spectrally integrated light intensity characteristics of the realized hybrid nanostructure. Measured emission profile of the fabricated sample as detected normally from the sample surface using a multimode fiber, a CCD imaging telescope, and a CCD-based spectroradiometer. A white light was introduced from an edge of the glass and was propagating inside the glass. The emission profile was measured along the ΓX direction of the octagonal QC. The main peak at 690 nm corresponds to the apparent resonant mode of the PC with a narrow FWHM of 21.5 nm.

Mentions: A white light was introduced from an edge of the glass and was propagating inside the glass. The QPC area was seen as a red area because of the wavelength-selective diffraction by the hybrid QPC. Figure 6 shows spectrally integrated light intensity characteristics of the sample as detected normally from the sample surface. The sample shows three peaks (616, 655, and 690 nm) in the spectrum. The resonant peaks appear due to the QPC feedback effect, and the full width at half-maximum (FWHM) of spectrum is of 21.5 nm at the main peak. These resonant peaks are considered to originate from different transverse guiding modes with different modal indices, which are diffracted to the normal direction by the QPC effect.


Novel hybrid organic/inorganic 2D quasiperiodic PC: from diffraction pattern to vertical light extraction.

Petti L, Rippa M, Zhou J, Manna L, Zanella M, Mormile P - Nanoscale Res Lett (2011)

Spectrally integrated light intensity characteristics of the realized hybrid nanostructure. Measured emission profile of the fabricated sample as detected normally from the sample surface using a multimode fiber, a CCD imaging telescope, and a CCD-based spectroradiometer. A white light was introduced from an edge of the glass and was propagating inside the glass. The emission profile was measured along the ΓX direction of the octagonal QC. The main peak at 690 nm corresponds to the apparent resonant mode of the PC with a narrow FWHM of 21.5 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211462&req=5

Figure 6: Spectrally integrated light intensity characteristics of the realized hybrid nanostructure. Measured emission profile of the fabricated sample as detected normally from the sample surface using a multimode fiber, a CCD imaging telescope, and a CCD-based spectroradiometer. A white light was introduced from an edge of the glass and was propagating inside the glass. The emission profile was measured along the ΓX direction of the octagonal QC. The main peak at 690 nm corresponds to the apparent resonant mode of the PC with a narrow FWHM of 21.5 nm.
Mentions: A white light was introduced from an edge of the glass and was propagating inside the glass. The QPC area was seen as a red area because of the wavelength-selective diffraction by the hybrid QPC. Figure 6 shows spectrally integrated light intensity characteristics of the sample as detected normally from the sample surface. The sample shows three peaks (616, 655, and 690 nm) in the spectrum. The resonant peaks appear due to the QPC feedback effect, and the full width at half-maximum (FWHM) of spectrum is of 21.5 nm at the main peak. These resonant peaks are considered to originate from different transverse guiding modes with different modal indices, which are diffracted to the normal direction by the QPC effect.

Bottom Line: Scanning electron microscopy, far field diffraction and spectra measurements are used to characterize the experimental structure.The vertical extraction of the light, by the coupling of the modes guided by the PQC slab to the free radiation via Bragg scattering, consists of a narrow red emissions band at 690 nm with a full width at half-maximum (FWHM) of 21.5 nm.The original characteristics of hybrid materials based on polymers and colloidal NRs, able to combine the unique optical properties of the inorganic moiety with the processability of the host matrix, are extremely appealing in view of their technological impact on the development of new high performing optical devices such as organic light-emitting diodes, ultra-low threshold lasers, and non-linear devices.PACS: 81.07.Pr Organic-inorganic hybrid nanostructures, 81.16.-c Methods of nanofabrication and processing, 42.70.Qs Photonic band-gap materials.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Cybernetics "E, Caianiello" of CNR, Via Campi Flegrei 34, 80072 Pozzuoli, Italy. L.petti@cib.na.cnr.it.

ABSTRACT
Recently, important efforts have been dedicated to the realization of a fascinating class of new photonic materials or metamaterials, known as photonic quasicrystals (PQCs), in which the lack of the translational symmetry is compensated by rotational symmetries not achievable by the conventional periodic crystals. As ever, more advanced functionality is demanded and one strategy is the introduction of non-linear and/or active functionality in photonic materials. In this view, core/shell nanorods (NRs) are a promising active material for light-emitting applications. In this article a two-dimensional (2D) hybrid a 2D octagonal PQC which consists of air rods in an organic/inorganic nanocomposite is proposed and experimentally demonstrated. The nanocomposite was prepared by incorporating CdSe/CdS core/shell NRs into a polymer matrix. The PQC was realized by electron beam lithography (EBL) technique. Scanning electron microscopy, far field diffraction and spectra measurements are used to characterize the experimental structure. The vertical extraction of the light, by the coupling of the modes guided by the PQC slab to the free radiation via Bragg scattering, consists of a narrow red emissions band at 690 nm with a full width at half-maximum (FWHM) of 21.5 nm. The original characteristics of hybrid materials based on polymers and colloidal NRs, able to combine the unique optical properties of the inorganic moiety with the processability of the host matrix, are extremely appealing in view of their technological impact on the development of new high performing optical devices such as organic light-emitting diodes, ultra-low threshold lasers, and non-linear devices.PACS: 81.07.Pr Organic-inorganic hybrid nanostructures, 81.16.-c Methods of nanofabrication and processing, 42.70.Qs Photonic band-gap materials.

No MeSH data available.


Related in: MedlinePlus