Examination of optical fibers by the luminescent method in the scanning electron microscope (SEM)

1984 ◽  
Vol 42 ◽  
pp. 360-361
Author(s):  
Oliver C. Wells ◽  
Philip J. Bailey
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Total Internal Reflection ◽  
Conducting Layer ◽  
Recorded Image ◽  
Luminescent Method ◽  
Scanning Electron

Light is transmitted along the central core of an optical fiber by total internal reflection at the interface with the surrounding layer. Here, we describe a method by which the optical properties of a cross-sectioned fibre can be studied by means of the luminescent image in the scanning electron microscope (SEM).The sample is prepared by depositing a thin cathodoluminescent layer over the end of a broken or cross-sectioned optical fiber. A thin conducting layer is then deposited to prevent charging. The far end of the fiber is optically coupled to a photomultiplier. During examination in the SEM, the sample is scanned by a fine electron beam, which gives a localised source of light on the surface of the sample at the point of impact of the beam. The quantity of light that is transmitted along the fiber to the photomultiplier determines the brightness of that particular pixel in the recorded image.

An SEM on a Chip

1997 ◽  
Vol 3 (S2) ◽  
pp. 1217-1218
Author(s):  
D.A. Crewe ◽  
A.D. Feinerman
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Optical Fibers ◽  
Circular Aperture ◽  
Fabrication Technology ◽  
Wafer Inspection ◽  
Electron Lens ◽  
Microfabrication Technique ◽  
Planar Electrodes ◽  
Scanning Electron

A silicon microfabrication technique has been applied toward the development of a Miniature Scanning Electron Microscope (MSEM). The fabrication technology is not only precise but is inexpensive compared to conventional methods of electron microscope construction and is easily extended to the construction of arrays of MSEMs for applications in high throughput e-beam lithography and wafer inspection.An electrostatic electron lens consists of a series of planar electrodes with central apertures that are precisely aligned to and electrically isolated from one another. This structure is fabricated using silicon as the electrode material and Pyrex optical fibers as the insulators. The electrodes are fabricated on four inch (100) orientation silicon wafers that are patterned on both sides and anisotropically etched to form four orthogonal v-grooves and an open diaphragm with a circular aperture in the center. The apertures are formed by reactive ion etching. The wafers are then diced to create approximately 100 7 mm by 9 mm electrodes.

Fabrication of Artificial Periodic Defects in Colloidal Photonic Crystals by Photolithography

2014 ◽  
Vol 665 ◽  
pp. 99-101
Author(s):  
Yong Qiang Zhao ◽  
Yu Song Zhi ◽  
Chao Rong Li ◽  
Xiao Bo Zhang
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Photonic Crystals ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Blue Shift ◽  
Colloidal Photonic Crystals ◽  
Scanning Electron

We introduce artificial periodic defects with required size in colloidal photonic crystals by a simple and inexpensive photolithography. The morphology of colloidal photonic crystals with defects is observed by field emission scanning electron microscope (SEM) and optical properties by UV-VIS spectra. We find that the periodic photoresist strips will cause a blue shift and the shift value depends on the the size of periodic photoresist strips.

Detection of Formation of Recombinant Human Keratinocyte Growth Factor Loaded Chitosan Nanoparticles Based on its Optical Properties

2018 ◽  
Vol 14 (2) ◽  
pp. 127-135 ◽  
Author(s):  
Palanirajan Vijayaraj Kumar ◽  
Marwan Abdelmahmoud Abdelkarim Maki ◽  
Mhd Luay Takahje ◽  
Yeong Siew Wei ◽  
Lee Ming Tatt ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Growth Factor ◽  
Scanning Electron Microscope ◽  
Keratinocyte Growth Factor ◽  
Chitosan Nanoparticles ◽  
Loading Capacity ◽  
Human Keratinocyte ◽  
Double Beam ◽  
Scanning Electron

Background: Recombinant human keratinocyte growth factor (rHuKGF) is a protein used to treat oral mucositis caused by radio and chemotherapy in patients with hematologic malignancy. The rHuKGF is available in the form of intravenous bolus injection. In this study, new formulation of rHuKGF-loaded chitosan nanoparticles was developed to improve patient compliance. Methods: Chitosan nanoparticles (CNPs) loaded with rHuKGF were prepared by ionic gelation method. The tripolyphosphate (TPP) cross-linked with chitosan molecules at pH >5.0 and form the nanoparticles. An infrared spectroscopic technique was conducted to confirm the formation of nanoparticles as a result of ionotropic interaction between TPP and chitosan. Zeta Sizer was used to determine the size, polydispersity index (PdI) and zeta potential of the prepared nanoparticles. The morphological characteristics of CNPs were measured by field emission scanning electron microscope. During the formation of CNPs, the rHuKGF was entrapped in the nanoparticles. The loading capacity of rHuKGF in CNPs was observed to be dependent on how much amount of rHuKGF/TPP solution was added to convert all the chitosan molecules to form nanoparticles. A double beam UV/Vis spectroscopic method was used to detect the formation of these rHuKGF loaded CNPs based on their optical properties. Results: The produced rHuKGF-loaded CNPs were colorless, cloudy, and positively charged monodisperse with a spherical shape. The prepared CNPs have particles size of 119 ± 74.62 nm, surface charge of +20.3 ± 6.46 mV and 0.217 polydispersity index. The shape of prepared CNPs was found to be spherical using field emission scanning electron microscope (FESEM). The interfacial polyelectrolyte complexation between TPP and chitosan was confirmed by comparing the FTIR spectra of TPP, chitosan, physical mixture of chitosan and TPP and CNPs. The loading capacity of the rHuKGF in CNPs was found to be 93.3 ± 2.02%. The formation of rHuKGF loaded CNPs was detected by double beam UV/Vis Spectroscopy at 232.2 nm. Conclusion: The results of the current work were utilized for designing a continuous monitoring and detection system for the formation of CNPs. The outcomes of this technique are useful to avoid the loss of rHuKGF during nanoparticle formation and improving the loading capacity of CNPs.

Synthesis of Silver Nanoparticles by Sparking Process

2016 ◽  
Vol 675-676 ◽  
pp. 73-76
Author(s):  
Thanut Jintakosol
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Low Cost ◽  
Ag Nps ◽  
Spherical Structure ◽  
Atomic Force ◽  
Scanning Electron

Silver nanoparticles (Ag NPs) were synthesized by sparking process. The NPs were continuously deposited onto the substrate by varying the number of sparking cycles ranging from 100-200 and deposited on the glass substrate and annealing at 250-500 °C for 1 hr. The effect of Ag NPs on their structure and optical characteristics were investigated. The optical properties of the NPs have been studied from by Raman spectroscopy and UV-vis spectrophotometer. The morphology of Ag NP was characterized by Scanning Electron Microscope (SEM) and Atomic force microscope (AFM). The results have shown mainly spherical structure of Ag NPs in diameter ranging from 80-100 nm. This study demonstrated that the Ag NPs can be synthesized by sparking process and simply with low cost.

scholarly journals Effects of Li+ Codoping on the Optical Properties of SrAl2O4 Long Afterglow Ceramic Phosphors

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Timur Sh. Atabaev ◽  
Hong Ha Thi Vu ◽  
Mac Kim ◽  
Yong Suk Yang ◽  
Hyung-Kook Kim ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Synthesis Method ◽  
Strontium Aluminate ◽  
X Ray Diffraction ◽  
High Brightness ◽  
X Ray ◽  
Long Afterglow ◽  
Scanning Electron

Rare-earths codoped long afterglow strontium aluminate phosphors with high brightness were synthesized via a facile combustion synthesis method using urea as a fuel. The resulted phosphor particles were analyzed by using X-ray diffraction and field emission scanning electron microscope, whereas their optical properties were monitored by photoluminescence spectroscopy. The prepared SrAl2O4:Eu2+, Dy3+, Li+ samples showed a broad green-yellowish emission, peaking at 512 nm when excited by 348 nm. Compared to traditional SrAl2O4:Eu2+, Dy3+ phosphor, the initial luminescence brightness of SrAl2O4:Eu2+, Dy3+, codoped with Li+ improved from 1.89 cd/m2 to 2.71 cd/m2 and the afterglow decay time was prolonged from 103 to 121 min. The possible mechanism of SrAl2O4:Eu2+, Dy3+, Li+ phosphorescence enhancement has been discussed.

scholarly journals Formation of planar plasmon microstructures by dry aerosol printing

2021 ◽  
Vol 2086 (1) ◽  
pp. 012147
Author(s):  
K M Khabarov ◽  
M Nouraldeen ◽  
A A Lizunova ◽  
M N Urazov ◽  
V V Ivanov
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Transmission Electron Microscope ◽  
Q Factor ◽  
Transmission Electron ◽  
Aerosol Printing ◽  
Individual Nanoparticles ◽  
Scanning Electron

Abstract Optical properties and microstructure of samples formed by dry aerosol printing are studied. Silver nanoparticles flat layers of two types were formed on substrates surfaces and were investigated by a spectrophotometer, a scanning electron microscope, and a transmission electron microscope. It is shown that all microstructures support plasmon resonance on individual nanoparticles with the Q factor depending both on the width of the nanoparticles size distribution in the aerosol and on their tendency to agglomeration and aggregation.

The Surface Morphology and Mechanical Behavior Studies of DAST Crystal on (001) and (110) Faces

2011 ◽  
Vol 197-198 ◽  
pp. 358-361 ◽  
Author(s):  
Hui Xu ◽  
Bing Teng ◽  
Zheng He Yu ◽  
Fei You ◽  
De Gao Zhong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Morphology ◽  
Mechanical Behavior ◽  
Vickers Hardness ◽  
Soft Material ◽  
Index Number ◽  
Structural And Optical Properties ◽  
Scanning Electron

4-dimethyla-mino-N-methyl 4-stilbazolium tosylate（DAST） crystals were prepared by the slope nucleation method (SNM). The structural and optical properties of the grown crystals were studied by employing powder XRD and FIIR. The surface morphology of DAST crystals was observed by scanning electron microscope (SEM). The Vickers hardness studies were carried out on (001) and (110) faces of grown DAST crystal. The values of Meyer’s index number n and hardness were calculated from Hv. The results showed that the DAST crystals belong to the soft material category.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

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