scholarly journals Large-Area Resonance-Tuned Metasurfaces for On-Demand Enhanced Spectroscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Masanobu Iwanaga ◽  
Bongseok Choi ◽  
Hideki T. Miyazaki ◽  
Yoshimasa Sugimoto ◽  
Kazuaki Sakoda
Keyword(s):  
Nanoimprint Lithography ◽  
Near Infrared ◽  
Cost Effective ◽  
Silicon On Insulator ◽  
Fine Tuning ◽  
Infrared Range ◽  
Large Area ◽  
Optical Resonance ◽  
Optical Resonances ◽  
Soi Substrates

We show an effective procedure for lateral structure tuning in nanoimprint lithography (NIL) that has been developed as a vertical top-down method fabricating large-area nanopatterns. The procedure was applied to optical resonance tuning in stacked complementary (SC) metasurfaces based on silicon-on-insulator (SOI) substrates and was found to realize structure tuning at nm precision using only one mold in the NIL process. The structure tuning enabled us to obtain fine tuning of the optical resonances, offering cost-effective, high-throughput, and high-precision nanofabrication. We also demonstrate that the tuned optical resonances selectively and significantly enhance fluorescence (FL) of dye molecules in a near-infrared range. FL intensity on a SC metasurface was found to be more than 450-fold larger than the FL intensity on flat Au film on base SOI substrate.

Carbon nanomaterials dedicated to heating systems

Circuit World ◽  
2015 ◽  
Vol 41 (3) ◽  
pp. 102-106 ◽  
Author(s):  
Grzegorz Wroblewski ◽  
Konrad Kielbasinski ◽  
Barbara Swatowska ◽  
Janusz Jaglarz ◽  
Konstanty Marszalek ◽  
...  
Keyword(s):  
Near Infrared ◽  
Carbon Nanomaterials ◽  
Spray Coating ◽  
Cost Effective ◽  
Infrared Range ◽  
Vacuum Deposition ◽  
Large Area ◽  
Content Type ◽  
Research Results ◽  
Interesting Alternative

Purpose – The paper aims to present the research results related to transparent heating elements made from carbon nanomaterials. Heating elements were fabricated only with cost-effective techniques with the aim to be easily implemented in large area applications. Presented materials and methods are an interesting alternative to vacuum deposition of transparent resistive layers and etching of low-resistive patterns. Fabricated heating elements were designed to be used as de-icing structures in roof-top windows. Design/methodology/approach – The paper presents the research results related to transparent heating elements made from carbon nanomaterials. Heating elements were fabricated only with cost-effective techniques with the aim to be easily implemented in large area applications. Presented materials and methods are an interesting alternative to vacuum deposition of transparent resistive layers and etching of low-resistive patterns. Fabricated heating elements were designed to be used as de-icing structures in roof-top windows. Findings – The sheet resistance of obtained layers was between 9 and 11 kΩ/□; however, double-walled carbon nanotubes showed significantly higher optical transmission (around 70 per cent) than graphene nanoplatelets (around 55 per cent for visible and near infrared range). The amount of polymer resin had the influence on the paints stability, electrical properties and coatings adhesion. Originality/value – Results show a novel method of fabrication of a large area and transparent heating elements with tunable resistance done through the change of spray coating paint composition.

scholarly journals CALCULATION OF THE REFLECTION SPECTRA OF Ge-Sb-Te DIFFRACTION GRATING USING THE TAUC–LORENTZ DISPERSION MODEL

2020 ◽  
Author(s):  
Ramil Minnullin ◽  
Dmitriy Korolev ◽  
Aleksandr Sapegin ◽  
Mikhail Barabanenkov
Keyword(s):  
Riccati Equation ◽  
Diffraction Grating ◽  
Near Infrared ◽  
Dispersion Model ◽  
Silicon On Insulator ◽  
Equation Method ◽  
Infrared Range ◽  
Reflection Spectra ◽  
Matrix Riccati Equation ◽  
Near Infrared Range

In this paper reflection spectra in the near infrared range are calculated for the diffraction grating of Ge-Sb-Te alloy on a silicon-on-insulator waveguide with use of Tauc–Lorentz dispersion model and Matrix Riccati Equation method.

scholarly journals Accurately Shaping Supercontinuum Spectrum via Cascaded PCF

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2478
Author(s):  
Jifang Rong ◽  
Hua Yang ◽  
Yuzhe Xiao
Keyword(s):  
Photonic Crystal ◽  
Pump Power ◽  
Near Infrared ◽  
Cost Effective ◽  
Infrared Range ◽  
Crystal Fiber ◽  
Red Edge ◽  
Supercontinuum Spectrum ◽  
Cost Effective Alternative ◽  
Near Infrared Range

Shaping is very necessary in order to obtain a wide and flat supercontinuum (SC). Via numerical simulations, we accurately demonstrated shaping the SC using the fiber cascading method to significantly increase the width as well as the flatness of the spectrum in silica photonic crystal fiber (PCF). The cascaded PCF contains two segments, each of which has dual zero-dispersion frequencies (ZDFs). The spectral range of the SC can be expanded tremendously by tuning the spacing between the two ZDFs of the first segmented cascaded PCF. Increasing the pump power generates more solitons at the red edge, which accelerates solitons trapping and improves the spectral flatness of the blue edge. Furthermore, cascading the second segmented PCF by choosing appropriate fiber parameters ensures the flatness of the red end of SC. Therefore, a cost-effective alternative method for broad and flat supercontinuum generation in the near-infrared range is proposed here, which can be implemented easily in any photonics laboratory, where dual ZDFs PCFs are commonly found.

Scanning Capacitance Microscopy for Failure Analysis of SOI-Based Advanced Microprocessors

2010 ◽  
Author(s):  
Lim Soon Huat ◽  
Lwin Hnin-Ei ◽  
Vinod Narang ◽  
J.M. Chin
Keyword(s):  
Failure Analysis ◽  
Electrical Characterization ◽  
Silicon On Insulator ◽  
Large Area ◽  
Scanning Capacitance Microscopy ◽  
Electrical Failure ◽  
Silicon Transistors ◽  
Soi Substrates ◽  
Electrical Data

Abstract Scanning capacitance microscopy (SCM) has been used in electrical failure analysis (EFA) to isolate failing silicon transistors on silicon-on-insulator (SOI) substrates. With the shrinking device geometry and increasing layout complexity, the defects in transistors are often non-visual and require detailed electrical analysis to pinpoint the defect signature. This paper demonstrates the use of SCM technique for EFA on SOI device substrates, as well as using this technique to isolate defective contacts in a relatively large-area scan of 25µm x 25µm. We also performed dC/dV electrical characterization of defective transistors, and correlated the data from SCM technique and electrical data from nano-probing to locate failing transistors.

scholarly journals Hyperspectral imaging in assessing the condition of plants: strengths and weaknesses

2019 ◽  
Vol 55 (1) ◽  
pp. 25-30
Author(s):  
Martyna Dominiak-Świgoń ◽  
Paweł Olejniczak ◽  
Maciej Nowak ◽  
Marlena Lembicz
Keyword(s):  
Neural Networks ◽  
Near Infrared ◽  
Vegetation Indices ◽  
Red Light ◽  
Infrared Range ◽  
Large Area ◽  
Deep Convolutional Neural Networks ◽  
Quick Method ◽  
Non Invasive ◽  
Area Monitoring

Abstract Hyperspectral remote sensing of plants is widely used in agriculture and forestry. Fast, large-area monitoring is applied, among others, in detecting and diagnosing diseases, stress conditions or predicting the yields. Using available tools to increase the yields of most important crop plants (wheat, rice, corn) without posing threat to food security is essential in the situation of current climate changes. Spectral plant indices are associated with biochemical and biophysical plant characteristics. Using the plant spectral properties (mainly chlorophyll red light absorption and near-infrared range light reflectance in leaf intercellular spaces), it is possible to estimate plant condition, water and carotenoid contents or detect disease. More and more often, based on commonly used hyperspectral vegetation indices, new, more sensitive indices are introduced. Furthermore, to facilitate data processing, artificial intelligence is employed, i.e., neural networks and deep convolutional neural networks. It is important in ecological research to carry out long-term observations and measurements of organisms throughout their lifespan. A non-invasive, quick method ensures that it may be used many times and at each stage of plant development.

High-performance near-infrared (NIR) polymer light-emitting diodes (PLEDs) based on bipolar Ir(iii)-complex-grafted polymers

2021 ◽  
Vol 9 (1) ◽  
pp. 173-180
Author(s):  
Wentao Li ◽  
Baowen Wang ◽  
Tiezheng Miao ◽  
Jiaxiang Liu ◽  
Guorui Fu ◽  
...  
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Cost Effective ◽  
Device Performance ◽  
Grafted Polymers ◽  
Large Area ◽  
Light Emitting ◽  
Doped Polymers ◽  
Polymer Light Emitting Diodes ◽  
The Cost

Despite the cost-effective and large-area scalable advantages of NIR-PLEDs based on iridium(iii)-complex-doped polymers, the intrinsic phase-separation issue leading to inferior device performance is difficult to address.

Playing with Plasmons: Tuning the Optical Resonant Properties of Metallic Nanoshells

MRS Bulletin ◽  
2005 ◽  
Vol 30 (5) ◽  
pp. 362-367 ◽  
Author(s):  
Naomi Halas
Keyword(s):  
Plasmon Resonance ◽  
Near Infrared ◽  
Near Field ◽  
Surface Enhanced Raman Spectroscopy ◽  
Metallic Nanostructures ◽  
Design Rule ◽  
Orbital Theory ◽  
Optical Resonance ◽  
Optical Resonances ◽  
Metallic Shell

AbstractNanoshells, concentric nanoparticles consisting of a dielectric core and a metallic shell, are simple spherical nanostructures with unique, geometrically tunable optical resonances. As with all metallic nanostructures, their optical properties are controlled by the collective electronic resonance, or plasmon resonance, of the constituent metal, typically silver or gold. In striking contrast to the resonant properties of solid metallic nanostructures, which exhibit only a weak tunability with size or aspect ratio, the optical resonance of a nanoshell is extraordinarily sensitive to the inner and outer dimensions of the metallic shell layer. The underlying reason for this lies beyond classical electromagnetic theory, where plasmon-resonant nanoparticles follow a mesoscale analogue of molecular orbital theory, hybridizing in precisely the same manner as the individual atomic wave functions in simple molecules. This plasmon hybridization picture provides an essential “design rule” for metallic nanostructures that can allow us to effectively predict their optical resonant properties. Such a systematic control of the far-field optical resonances of metallic nanostructures is accomplished simultaneously with control of the field at the surface of the nanostructure. The nanoshell geometry is ideal for tuning and optimizing the near-field response as a stand-alone surface-enhanced Raman spectroscopy (SERS) nanosensor substrate and as a surface-plasmon-resonant nanosensor.Tuning the plasmon resonance of nanoshells into the near-infrared region of the spectrum has enabled a variety of biomedical applications that exploit the strong optical contrast available with nanoshells in a spectral region where blood and tissue are optimally transparent.

Infrared and Visible—Near Infrared Electroluminescence Developments for FA in AlGaN/GaN HEMTS on SiC

2010 ◽  
Author(s):  
M. Bouya ◽  
D. Carisetti ◽  
J.C. Clement ◽  
N. Malbert ◽  
N. Labat ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Near Infrared ◽  
High Electron Mobility Transistor ◽  
Low Noise ◽  
Civil Defense ◽  
Base Stations ◽  
Infrared Range ◽  
High Electron ◽  
Radar Applications ◽  
Gan Hemts

Abstract HEMT (High Electron Mobility Transistor) are playing a key role for power and RF low noise applications. They are crucial components for the development of base stations in the telecommunications networks and for civil, defense and space radar applications. As well as the improvement of the MMIC performances, the localization of the defects and the failure analysis of these devices are very challenging. To face these challenges, we have developed a complete approach, without degrading the component, based on front side failure analysis by standard (Visible-NIR) and Infrared (range of wavelength: 3-5 µm) electroluminescence techniques. Its complementarities and efficiency have been demonstrated through two case studies.

scholarly journals Mastering of NIL Stamps with Undercut T-Shaped Features from Single Layer to Multilayer Stamps

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 956
Author(s):  
Philipp Taus ◽  
Adrian Prinz ◽  
Heinz D. Wanzenboeck ◽  
Patrick Schuller ◽  
Anton Tsenov ◽  
...  
Keyword(s):  
Electron Beam Lithography ◽  
Nanoimprint Lithography ◽  
Silicon Oxide ◽  
Three Dimensional ◽  
Single Layer ◽  
Fabrication Technology ◽  
Large Area ◽  
Structural Colors ◽  
Biomimetic Structures ◽  
Morpho Butterfly

Biomimetic structures such as structural colors demand a fabrication technology of complex three-dimensional nanostructures on large areas. Nanoimprint lithography (NIL) is capable of large area replication of three-dimensional structures, but the master stamp fabrication is often a bottleneck. We have demonstrated different approaches allowing for the generation of sophisticated undercut T-shaped masters for NIL replication. With a layer-stack of phase transition material (PTM) on poly-Si, we have demonstrated the successful fabrication of a single layer undercut T-shaped structure. With a multilayer-stack of silicon oxide on silicon, we have shown the successful fabrication of a multilayer undercut T-shaped structures. For patterning optical lithography, electron beam lithography and nanoimprint lithography have been compared and have yielded structures from 10 µm down to 300 nm. The multilayer undercut T-shaped structures closely resemble the geometry of the surface of a Morpho butterfly, and may be used in future to replicate structural colors on artificial surfaces.

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