OPTICAL RESONANCES OF A PLASMA NATURE IN TWO-LAYER NANOSPHEROIDS

2021 ◽  
Author(s):  
V. G. Farafonov ◽  
◽  
V. I. Ustimov ◽  
A. E. Farafonova ◽  
◽  
...  
Keyword(s):  
Light Scattering ◽  
Incident Wave ◽  
Shell Thickness ◽  
Optical Resonance ◽  
Optical Resonances ◽  
Particle Geometry ◽  
Silver Shell

The process of light scattering by two-layer spheroids consisting of a dielectric core and a silver shell, which depends on the length of an incident wave and particle geometry, is considered. One optical resonance is observed when the foci of the nuclear surfaces and the shell coincide, while when this condition is violated, additional resonances appear. Namely, in the absorption and scattering bands, resonances were found, including previously unknown ones, the position and intensity of which depended on the shell thickness, the shape of the spheroid and its core. To substantiate the reliability of the results obtained, the convergence of the calculations was analyzed depending on the number of harmonics which were taken into consideration in the calculations.

Enhanced Absorption of Single Silicon Nanowire with Si3N4 Shell for Photovoltaic Applications

2015 ◽  
Vol 1090 ◽  
pp. 173-177 ◽  
Author(s):  
Wen Fu Liu ◽  
Hua Li Hao
Keyword(s):  
Light Scattering ◽  
Light Absorption ◽  
Calculated Result ◽  
Scattering Theory ◽  
Enhancement Factor ◽  
Shell Thickness ◽  
Silicon Nanowire ◽  
Enhanced Absorption ◽  
Photovoltaic Applications

Based on the Lorenz-Mie light scattering theory, we have calculated the light absorption of single silicon nanowire with Si3N4coating, and compared with pure single silicon nanowire. The calculated result indicates that there exists an enhanced absorption in the Si3N4-coated silicon nanowire and shows a great photocurrent enhancement factor (~70%) for the coaxial NW with the shell thickness of ~70 nm. For a special shell thickness (175 nm) in the Si3N4-coated silicon nanowire forr= 150 nm, the enhancement comes up to ~98.45%.

Sonochemical Preparation of Polymer Microcapsules

2013 ◽  
Vol 631-632 ◽  
pp. 86-89 ◽  
Author(s):  
Sheng Wei Guo ◽  
Gu Xia Wang
Keyword(s):  
Free Energy ◽  
Light Scattering ◽  
Shell Thickness ◽  
Materials Science ◽  
Unit Area ◽  
Hollow Structure ◽  
Important Application ◽  
Interface Condition ◽  
Sonochemical Method ◽  
Interface Free Energy

Polymer microcapsules have important application in the fields of biochemistry and materials science owing to their unique structures and functions. Poly(styrene-methyl methacrylate) (PS-co-PMMA) microcapsules were prepared through sonochemical method. The results reveal that it is difficult to form a microcapsule structure from neat styrene (St). However, MMA can improve the interface condition for its higher hydrophilicity. Therefore, it is easier to form hollow structure because polymer microcapsules have a lower interface free energy per unit area. FTIR results confirm that polymer microcapsules have both the typical peaks of PS and PMMA. The results of dynamic light scattering (DLS) and TEM show that PS-co-PMMA microcapsules are uniform in size(about 100 nm in diameter and 20~25 nm in shell thickness).

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.

scholarly journals Transparent multispectral photodetectors mimicking the human visual system

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Qitong Li ◽  
Jorik van de Groep ◽  
Yifei Wang ◽  
Pieter G. Kik ◽  
Mark L. Brongersma
Keyword(s):  
Optical Measurement ◽  
Electronic Devices ◽  
Critical Role ◽  
Semiconductor Nanowires ◽  
Optical Resonance ◽  
Radiative Coupling ◽  
Measurement Systems ◽  
Optical Resonances ◽  
Dielectric Interfaces

Abstract Compact and lightweight photodetection elements play a critical role in the newly emerging augmented reality, wearable and sensing technologies. In these technologies, devices are preferred to be transparent to form an optical interface between a viewer and the outside world. For this reason, it is of great value to create detection platforms that are imperceptible to the human eye directly onto transparent substrates. Semiconductor nanowires (NWs) make ideal photodetectors as their optical resonances enable parsing of the multi-dimensional information carried by light. Unfortunately, these optical resonances also give rise to strong, undesired light scattering. In this work, we illustrate how a new optical resonance arising from the radiative coupling between arrayed silicon NWs can be harnessed to remove reflections from dielectric interfaces while affording spectro-polarimetric detection. The demonstrated transparent photodetector concept opens up promising platforms for transparent substrates as the base for opto-electronic devices and in situ optical measurement systems.

scholarly journals Optical-resonance-assisted generation of super monodisperse microdroplets and microbeads with nanometer precision

Lab on a Chip ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 734-740 ◽  
Author(s):  
Dmitry Richter ◽  
Matevž Marinčič ◽  
Matjaž Humar
Keyword(s):  
Optical Resonance ◽  
Nanometer Size ◽  
Optical Resonances

Microdroplets and microbeads were produced with nanometer size precision by observing the optical resonances and used as optical barcodes.

scholarly journals Simulations of the Light Scattering Properties of Metal/Oxide Core/Shell Nanospheres

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
F. Ruffino ◽  
G. Piccitto ◽  
M. G. Grimaldi
Keyword(s):  
Light Scattering ◽  
Organic Solar Cells ◽  
Shell Thickness ◽  
Light Trapping ◽  
Thickness Ratio ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Light Scattering Intensity ◽  
Core Shell Nanoparticles ◽  
Theoretical Results

Given the importance of the optical properties of metal/dielectric core/shell nanoparticles, in this work we focus our attention on the light scattering properties, within the Mie framework, of some specific categories of these noteworthy nanostructures. In particular, we report theoretical results of angle-dependent light scattering intensity and scattering efficiency for Ag/Ag2O, Al/Al2O2, Cu/Cu2O, Pd/PdO, and Ti/TiO2 core/shell nanoparticles as a function of the core radius/shell thickness ratio and on a relative comparison. The results highlight the light scattering characteristics of these systems as a function of the radius/shell thickness ratio, helping in the choice of the more suitable materials and sizes for specific applications (i.e., dynamic light scattering for biological and molecular recognition, increasing light trapping in thin-film silicon, organic solar cells for achieving a higher photocurrent).

Precision Measurement of Particulates by Light Scattering at Optical Resonance

Science ◽  
1975 ◽  
Vol 190 (4212) ◽  
pp. 375-377 ◽  
Author(s):  
T. R. Marshall ◽  
C. S. Parmenter ◽  
M. Seaver
Keyword(s):  
Light Scattering ◽  
Precision Measurement ◽  
Optical Resonance
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