Near-field optical microscopy of polymer-based films with dispersed terthiophene chromophores for polarizer applications

Ambrosio, Antonio; Alderighi, Michele; Labardi, M.; Pardi, L.; Fuso, Francesco; Allegrini, M.; Nannizzi, Sara; Pucci, Andrea; Ruggeri, Giacomo

doi:10.1088/0957-4484/15/4/029

Cited by 17 publications

(15 citation statements)

References 26 publications

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“…PEO/PMMA blends are miscible at a low temperature while they demonstrate to be immiscible at a high temperature such as 400 K, 4 which is consistent with the experimental results of Fernandes et al 5 Several experimental results show that when microscopic or mesoscopic morphology of polymers possesses regular distribution, the properties of these polymers are different from ordinary ones; thus they may be useful in engineering and polymer industry. [6][7][8] However, there haven't been any reports about the inducing effects of patterned surfaces on the PEO/PMMA blends system, whose plain blends are immiscible at 400 K. Some inspiring results were obtained in this work, which can be applied to surface-fabrication to improve the function of surface-materials.…”

Section: Introductionmentioning

confidence: 70%

Modeling and analysis of the compatibility of poly(ethylene oxide)/poly(methyl methacrylate) blends with surface and shear inducing effects

Mu¹,

Qu²,

Wang³

2011

J of Applied Polymer Sci

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The compatibility of poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) blends was studied over a wide range of compositions at 400 K by mesoscopic modeling. Sixteen patterned surfaces of four types were designed and designated as ''ci,'' ''co,'' ''gra,'' and ''rg'' to study their influence on changing the microscopic phase morphology. The topography of the ''ci'' series surfaces was shaped by semicircular balls. Different radii were applied to simulate different degrees of surface roughness. The ''co'' series were composed of cubic columns as the mask, and the cubic columns were separated by equal spaces. Various sizes and heights of columns were used to simulate different degrees of surface roughness. The ''gra'' series were composed of surfaces with different areas of section and the same height to simulate different degrees of surface roughness. The ''rg'' series were composed of concentric cuboids with continuous increasing heights and sizes. The ''co'' series surfaces were the most efficient distribution in changing the microscopic phase morphology, the ''gra'' and ''rg'' series surfaces were both the secondary, and the ''ci'' series surfaces placed the last. The results show that the effect of inducing surfaces depended on both the pattern of surfaces and the compositions of the blends. The shear effect was effective in changing the phase morphology, but its influencing effect depended on not only the shear rate, but also the compositions of the blends, especially when the blends were rich in PEO.

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Section: Introductionmentioning

confidence: 70%

Modeling and analysis of the compatibility of poly(ethylene oxide)/poly(methyl methacrylate) blends with surface and shear inducing effects

Mu¹,

Qu²,

Wang³

2011

J of Applied Polymer Sci

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“…Note that the term diattenuation refers to the difference in transmittance of the two polarization modes, while dichroism more traditionally refers to the difference in absorption coefficients [46]. Therefore the use of the term diattenuation is more accurate in transmission experiments [47], while we can refer to dichroism as the measured quantity if fluorescence is detected (as a result of light absorption and re-emission from the sample) [48].…”

Section: The Jones Formalismmentioning

confidence: 99%

“…Two experimental approaches have been used to rotate the polarization of the probing light, using PEMs and EOMs. The PEM [50,76] provides a sinusoidal phase change δ ∝ sin(ωt), while the EOM [28,48,77,78] is characterized by a linear phase change δ ∝ ωt. The respective Jones matrices are reported in Table 10.2.…”

Section: Polarization-modulation Snom: Illumination Modementioning

confidence: 99%

“…SEM, while offering suitable spatial resolution, does not provide information on the optical characteristics of the samples. Our group has recently applied PM-SNOM to stretched polymer films in order to provide a quantitative measurement of the local dichroic ratio in PE samples [48]. Samples are produced starting from a p-xylene solution of a terthiophene-derived chromophore and UHMW-PE.…”

Section: Polarization Anisotropy In Polymersmentioning

confidence: 99%

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Polarization-Modulation Techniques in Near-Field Optical Microscopy for Imaging of Polarization Anisotropy in Photonic Nanostructures

Gucciardi

Micheletto

Kawakami

et al. 2006

Applied Scanning Probe Methods II

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“…In this paper we describe a PM-SNOM system in its most efficient configuration [3]. Also, we will show our first experimental data indicating that SQWs in InGaN samples indeed have polarization PL emission in local domains.…”

mentioning

confidence: 99%

The study of InGaN SQW materials with Polarization Modulation SNOM

Micheletto¹,

Yamada²,

Kawakami³

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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We investigate on the photoluminescence spatial unhomogeneities of InGaN/GaN interface with a Polarization Modulation Scanning Near-field Tunneling Microscope. We could demonstrate for the first time nanometer sized domains that present polarization-changing properties.The comprehension of the fundamental phenomena involved in the light emission of InGaN/GaN based LED and Laser materials is important in the achievement of better quantum efficiency and further progress of these devices.In this study we focalized on the development of a Polarization Modulation technique for SNOM system in order to investigate on the polarization properties of InGaN samples [1,2]. In this paper we describe a PM-SNOM system in its most efficient configuration [3]. Also, we will show our first experimental data indicating that SQWs in InGaN samples indeed have polarization PL emission in local domains.The PM-SNOM system described here is shown schematically in figure 1.In this system a laser beam of 442 nm wavelength is passed through a /4 filter in order to have a circularly polarized beam. The light is impinged in the nano-probe that guides it to the InGaN sample producing PL at about 540 nm. A color filter at 500 nm removes the excitation component and signal is passed through the Polarization Modulation (PM) element, a rotating Polaroid. Signal is then collected by a photodetector and then mapped (SNOM). A second map is simultaneously generated by a lock-in amplifier synchronized to the modulation frequency (PM-SNOM).Since signal at phototube is the result of complex interaction between modulating and filtering elements we understand that the information enclosed in a PM-SNOM experiment must be analyzed carefully in order to avoid artifacts. We performed the PL experiment and we obtained first evidence of polarized PL emission as shown in fig. 2 (15x15µm) indicating that anisotropic strain in the crystal can induce asymmetry in the carrier confinement [4]. a1123_1.pdfJTuD49.pdf

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Near-field optical microscopy of polymer-based films with dispersed terthiophene chromophores for polarizer applications

Cited by 17 publications

References 26 publications

Modeling and analysis of the compatibility of poly(ethylene oxide)/poly(methyl methacrylate) blends with surface and shear inducing effects

Modeling and analysis of the compatibility of poly(ethylene oxide)/poly(methyl methacrylate) blends with surface and shear inducing effects

Polarization-Modulation Techniques in Near-Field Optical Microscopy for Imaging of Polarization Anisotropy in Photonic Nanostructures

The study of InGaN SQW materials with Polarization Modulation SNOM

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