Composition variation in Al-based dilute nitride alloys using apertureless scanning near-field optical microscopy

2016 ◽  
Vol 18 (44) ◽  
pp. 30546-30553 ◽  
Author(s):  
G. Kolhatkar ◽  
A. Boucherif ◽  
C. Dab ◽  
S. Fafard ◽  
V. Aimez ◽  
...  
Keyword(s):  
Refractive Index ◽  
Phase Separation ◽  
Optical Microscopy ◽  
Near Field ◽  
Dilute Nitride ◽  
Composition Variation ◽  
Nitride Alloys

Using apertureless scanning near-field optical microscopy to map refractive index variations, we study the phase separation in AlGaNAs alloys.

Near-Field Scanning Optical Microscopy of Phase Separation Effects in Dilute Nitride Alloys.

2004 ◽  
Vol 838 ◽  
Author(s):  
Alexander Mintairov ◽  
Thomas Kosel ◽  
Kai Sun ◽  
Victor Ustinov ◽  
James Merz
Keyword(s):  
Phase Separation ◽  
Optical Microscopy ◽  
Structural Parameters ◽  
Near Field ◽  
Dilute Nitride ◽  
Temperature Dependent ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning ◽  
Nitrogen Excess ◽  
Formation Phase

ABSTRACTThe effect of nitrogen composition on structural parameters of intrinsic quantum dots (QDs) has been studied in GaAs1-yNy and InxGa1-xAs1-yNy alloys (y∼0. 015–0.03) using low-temperature near-field scanning optical microscopy (NSOM) combined with magneto-photoluminescence spectroscopy. We used measurements of the diamagnetic shift (magnetic field strength 0–10T), temperature dependent spectra (temperature range 5–300K) and near-field monochromatic images for the estimation of the size, nitrogen excess and density of QDs. The obtained values (size ∼10–30 nm, nitrogen excess ∼0.005 and density ∼100 /μm-3) suggest spontaneous formation (phase separation) of QDs. Strong lateral inhomogeniety of the QD distribution on a micron length scale was observed.

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 %).

scholarly journals Mapping the Distribution of Refractive Index in Photopolymer Film with Scanning Near-field Optical Microscopy

2004 ◽  
Vol 17 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Noritake Yamamoto ◽  
Hideo Tanigawa ◽  
Toshihiko Mizokuro ◽  
Nobutaka Tanigaki ◽  
Hiroyuki Mochizuki ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Microscopy ◽  
Near Field

Phase-Separation Structure of a Monolayer of Binary Polymer Blend Studied by Fluorescence Scanning Near-Field Optical Microscopy

1999 ◽  
Vol 103 (48) ◽  
pp. 10553-10556 ◽  
Author(s):  
Hiroyuki Aoki ◽  
Yuji Sakurai ◽  
Shinzaburo Ito ◽  
Tatsuo Nakagawa
Keyword(s):  
Phase Separation ◽  
Optical Microscopy ◽  
Polymer Blend ◽  
Near Field ◽  
Binary Polymer

scholarly journals Near-field penetrating optical microscopy: a live cell nanoscale refractive index measurement technique for quantification of internal macromolecular density

2012 ◽  
Vol 37 (4) ◽  
pp. 506 ◽  
Author(s):  
Samantha Dale Strasser ◽  
Gajendra Shekhawat ◽  
Jeremy D. Rogers ◽  
Vinayak P. Dravid ◽  
Allen Taflove ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Microscopy ◽  
Measurement Technique ◽  
Near Field ◽  
Live Cell ◽  
Refractive Index Measurement ◽  
Index Measurement

scholarly journals Phase separation in polyaniline with near-field scanning optical microscopy

1997 ◽  
Vol 36 (15) ◽  
pp. 3301 ◽  
Author(s):  
Pei-Kuen Wei ◽  
Jui-Hung Hsu ◽  
Wunshain Fann ◽  
Kuen-Ru Chuang ◽  
Hsun-Tsing Lee ◽  
...  
Keyword(s):  
Phase Separation ◽  
Optical Microscopy ◽  
Near Field ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

Properties of Europium (III) Chelating Polymer Film

2013 ◽  
Vol 750-752 ◽  
pp. 836-839
Author(s):  
Hao Liang ◽  
Fang Xie ◽  
Yi Fa Chen ◽  
Xiao Jun Ren
Keyword(s):  
Refractive Index ◽  
Film Thickness ◽  
Optical Microscopy ◽  
Polymer Film ◽  
Near Field ◽  
Good Surface ◽  
Chelating Polymer ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

A europium (III) chelating polymer film has been investigated by fluorescence spectrum, lifetime measurement, near-field scanning optical microscopy (NSOM) and m-line method. The obtained film thickness is 1.748μm and refractive index is 1.571. Near-field scanning optical microscopy shows the good surface quality of the Europium (III) chelating polymer film.

Refractive-index patterning using near-field scanning optical microscopy

2001 ◽  
Vol 78 (1) ◽  
pp. 13-15 ◽  
Author(s):  
Satoshi Takahashi ◽  
Katsutoshi Samata ◽  
Hirokazu Muta ◽  
Shinjiro Machida ◽  
Kazuyuki Horie
Keyword(s):  
Refractive Index ◽  
Optical Microscopy ◽  
Near Field ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning
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