Cover Picture: Imaging the Fluorescence Decay Lifetime of a Conjugated-Polymer Blend By Using a Scanning Near-Field Optical Microscope (Adv. Mater. 1/2007)

2007 ◽  
Vol 19 (1) ◽  
pp. NA-NA
Author(s):  
A. J. Cadby ◽  
R. Dean ◽  
C. Elliott ◽  
R. A. L. Jones ◽  
A. M. Fox ◽  
...  
Keyword(s):  
Polymer Blend ◽  
Conjugated Polymer ◽  
Near Field ◽  
Optical Microscope ◽  
Fluorescence Decay ◽  
Decay Lifetime

Imaging the Fluorescence Decay Lifetime of a Conjugated-Polymer Blend By Using a Scanning Near-Field Optical Microscope

2007 ◽  
Vol 19 (1) ◽  
pp. 107-111 ◽  
Author(s):  
A. J. Cadby ◽  
R. Dean ◽  
C. Elliott ◽  
R. A. L. Jones ◽  
A. M. Fox ◽  
...  
Keyword(s):  
Polymer Blend ◽  
Conjugated Polymer ◽  
Near Field ◽  
Optical Microscope ◽  
Fluorescence Decay ◽  
Decay Lifetime

Mapping the Fluorescence Decay Lifetime of a Conjugated Polymer in a Phase-Separated Blend Using a Scanning Near-Field Optical Microscope

Nano Letters ◽  
2005 ◽  
Vol 5 (11) ◽  
pp. 2232-2237 ◽  
Author(s):  
A. Cadby ◽  
R. Dean ◽  
A. M. Fox ◽  
R. A. L. Jones ◽  
D. G. Lidzey
Keyword(s):  
Conjugated Polymer ◽  
Near Field ◽  
Optical Microscope ◽  
Fluorescence Decay ◽  
Decay Lifetime

Near-field photoconductivity imaging of a conjugated polymer blend

2001 ◽  
Vol 708 ◽  
Author(s):  
R. Riehn ◽  
R. Stevenson ◽  
J.J.M. Halls ◽  
D.R. Richards ◽  
D.-J. Kang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Chemical Composition ◽  
Optical Microscopy ◽  
Polymer Blend ◽  
Conjugated Polymer ◽  
Near Field ◽  
Absorbed Energy ◽  
Generation Efficiency ◽  
Good Correspondence ◽  
Photocurrent Generation

ABSTRACTWe report combined scanning near-field optical microscopy (SNOM) and near-field photocurrent (NPC) imaging of a binary conjugated polymer blend. We find phase separation on a scale of about 5 μm, with a good correspondence between topographic, fluorescence, and photocurrent images. We excited at 488 nm, a wavelength at which only one of the two polymers absorbs light. Under this illumination regions that are high in the topography image show high luminescence and photocurrent.The photoluminescence (PL) efficiencies in the different regions of the sample were determined by calculating the absorbed energy using the Bethe-Bouwkamp model, and knowledge about the chemical composition of the different phases of the polymer blend. The calculation also allowed us to conclude that the photocurrent generation efficiency (current/absorbed photons) of the different polymer phases is comparable within the limit of confidence of this experiment (±10 %).

Local Probing of Photocurrent and Photoluminescence in a Phase-Separated Conjugated-Polymer Blend by Means of Near-Field Excitation

2006 ◽  
Vol 16 (4) ◽  
pp. 469-476 ◽  
Author(s):  
R. Riehn ◽  
R. Stevenson ◽  
D. Richards ◽  
D.-J. Kang ◽  
M. Blamire ◽  
...  
Keyword(s):  
Polymer Blend ◽  
Conjugated Polymer ◽  
Near Field ◽  
Field Excitation

Conjugated polymer studies by near-field scanning optical microscope

1995 ◽  
Author(s):  
Wunshain S. Fann ◽  
Pei-Kuen Wei ◽  
Jui-Hung Hsu ◽  
Bing R. Hsieh ◽  
Kuen-Ru Chuang ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Near Field ◽  
Optical Microscope ◽  
Near Field Scanning

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

scholarly journals Recent advances in characterizing the “bee” structures and asphaltene particles in asphalt binders

2020 ◽  
Vol 13 (6) ◽  
pp. 697-706
Author(s):  
Yuhong Wang ◽  
Kecheng Zhao ◽  
Fangjin Li ◽  
Qi Gao ◽  
King Wai Chiu Lai
Keyword(s):  
Near Field ◽  
Asphalt Binder ◽  
Optical Microscope ◽  
Asphalt Binders ◽  
Zero Shear Viscosity ◽  
Surface Features ◽  
Asphaltene Content ◽  
Scanning Transmission ◽  
Before And After ◽  
Binder Aging

AbstractThe microscopic surface features of asphalt binders are extensively reported in existing literature, but relatively fewer studies are performed on the morphology of asphaltene microstructures and cross-examination between the surface features and asphaltenes. This paper reports the findings of investigating six types of asphalt binders at the nanoscale, assisted with atomic force microscopy (AFM) and scanning transmission electron microscopy (STEM). The surface features of the asphalt binders were examined by using AFM before and after being repetitively peeled by a tape. Variations in infrared (IR) absorbance at the wavenumber around 1700 cm−1, which corresponds to ketones, were examined by using an infrared s-SNOM instrument (scattering-type scanning near-field optical microscope). Thin films of asphalt binders were examined by using STEM, and separate asphaltene particles were cross-examined by using both STEM and AFM. In addition, connections between the microstructures and binder’s physicochemical properties were evaluated. The use of both microscopy techniques provide comprehensive and complementary information on the microscopic nature of asphalt binders. It was found that the dynamic viscosities of asphalt binders are predominantly determined by the zero shear viscosity of the corresponding maltenes and asphaltene content. Limited samples also suggest that the unique bee structures are likely related to the growth of asphaltene content during asphalt binder aging process, but more asphalt binders from different crude sources are needed to verify this finding.

Optical constants from scattering-type scanning near-field optical microscope

2021 ◽  
Vol 118 (4) ◽  
pp. 041103
Author(s):  
Xiao Guo ◽  
Karl Bertling ◽  
Aleksandar D. Rakić
Keyword(s):  
Optical Constants ◽  
Near Field ◽  
Optical Microscope
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