Analysis on near field scattering spectra around nanoparticles by using parametric indirect microscopic imaging

2016 ◽  
Vol 377 ◽  
pp. 59-64 ◽  
Author(s):  
Liu Guoyan ◽  
Gao Kun ◽  
Liu Xuefeng ◽  
Ni Guoqiang
Keyword(s):  
Near Field ◽  
Microscopic Imaging ◽  
Scattering Spectra

Study of Hot Spots Probing Based on Meta-Pillars Array

2019 ◽  
Vol 16 (9) ◽  
pp. 3692-3697
Author(s):  
Yisha You ◽  
Fujuan Huang ◽  
Yongqi Fu ◽  
Shaoli Zhu
Keyword(s):  
Hot Spots ◽  
Near Field ◽  
Optical Microscope ◽  
Microscopic Imaging ◽  
Secondary Sources ◽  
Imaging Application ◽  
Calculation Results ◽  
Wavelength Resolution ◽  
Near Field Scanning ◽  
Sub Wavelength

Inspired by imaging principle of near-field scanning optical microscope (NSOM), meta-pillars array is designed and analyzed on the basis of microscopic imaging application with high resolution. Finely focused spots acting as tiny secondary sources for illumination at near-field can be derived under supporting of the meta-pillars for the purpose of increasing imaging resolution. Numerical calculation is carried out on the basis of finite difference and time domain (FDTD) algorithm. Our calculation results demonstrate that the meta-pillars are capable of supporting the microscopic imaging at sub-wavelength resolution.

scholarly journals Quantitative coherent scattering spectra in apertureless terahertz pulse near-field microscopes

2012 ◽  
Vol 101 (1) ◽  
pp. 011109 ◽  
Author(s):  
Kiwon Moon ◽  
Youngwoong Do ◽  
Meehyun Lim ◽  
Gyuseok Lee ◽  
Hyeona Kang ◽  
...  
Keyword(s):  
Near Field ◽  
Coherent Scattering ◽  
Terahertz Pulse ◽  
Scattering Spectra

scholarly journals Light sheet fluorescence microscopic imaging for high-resolution visualization of spray dynamics

2017 ◽  
Vol 10 (1) ◽  
pp. 86-98 ◽  
Author(s):  
Edouard Berrocal ◽  
Elias Kristensson ◽  
Lars Zigan
Keyword(s):  
Near Field ◽  
Direct Injection ◽  
Light Sheet ◽  
Mie Scattering ◽  
Depth Of Field ◽  
Microscopic Imaging ◽  
Swirl Atomizer ◽  
Direct Injection Spark Ignition ◽  
Dynamics Models ◽  
Pressure Swirl

In this study, the use of light sheet fluorescence microscopic imaging is demonstrated for viewing the dynamic of atomizing sprays with high contrast and resolution. The technique presents several advantages. First, liquid fluorescence gives a more faithful representation of the structure of liquid bodies, droplets, and ligaments than Mie scattering does. The reason for this is that the signal is emitted by the fluorescing dye molecules inside the liquid itself and not generated at the air–liquid interfaces. Second, despite the short depth of field (∼200 µm) obtained when using the long range microscope, the contribution of out-of-focus light is much smaller on a light sheet configuration than for line-of-sight detection, thus providing more clearly sectioned images. Finally, by positioning the light sheet on the spray periphery, toward the camera objective, the effects due to multiple light scattering phenomena can be reduced to some extent. All these features provide, for many spray situations, good fidelity images of the liquid fluid, allowing the extraction of the velocity vectors at the liquid boundaries. Here, double frame images were recorded with a sCMOS camera with a time delay of 5 µs between exposures. A typical pressure-swirl atomizer is used producing a water hollow-cone spray, which was imaged in the near-nozzle region and further downstream for injection pressures between 20 bar and 100 bar. Furthermore, near-nozzle spray shape visualization of a direct-injection spark ignition injector was conducted, describing the disintegration of the liquid fuel and droplet formation. Such data are important for the validation of computational fluid dynamics models simulating liquid breakups in the near-field spray region.

Near-Field Raman Scattering Spectra of Ferroelectric Thin Films

2010 ◽  
Vol 402 (1) ◽  
pp. 23-28
Author(s):  
Akira Sakai ◽  
Hiroki Abe ◽  
Jun Fushiki
Keyword(s):  
Thin Films ◽  
Raman Scattering ◽  
Near Field ◽  
Ferroelectric Thin Films ◽  
Scattering Spectra ◽  
Raman Scattering Spectra

scholarly journals Transition to strong coupling regime in hybrid plasmonic systems: exciton-induced transparency and Fano interference

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tigran V. Shahbazyan
Keyword(s):  
Strong Coupling ◽  
Energy Exchange ◽  
Near Field ◽  
Plasmon Mode ◽  
Strong Coupling Regime ◽  
Field Coupling ◽  
Fano Interference ◽  
Scattering Spectra ◽  
Spectral Asymmetry ◽  
Induced Transparency

Abstract We present a microscopic model describing the transition to a strong coupling regime for an emitter resonantly coupled to a surface plasmon in a metal–dielectric structure. We demonstrate that the shape of scattering spectra is determined by an interplay of two distinct mechanisms. First is the near-field coupling between the emitter and the plasmon mode which underpins energy exchange between the system components and gives rise to exciton-induced transparency minimum in scattering spectra prior to the transition to a strong coupling regime. The second mechanism is the Fano interference between the plasmon dipole and the plasmon-induced emitter’s dipole as the system interacts with the radiation field. We show that the Fano interference can strongly affect the overall shape of scattering spectra, leading to the inversion of spectral asymmetry that was recently reported in the experiment.

scholarly journals Терагерцевый ближнепольный отклик в лентах графена

2020 ◽  
Vol 46 (15) ◽  
pp. 29
Author(s):  
П.А. Алексеев ◽  
Б.Р. Бородин ◽  
И.А. Мустафин ◽  
А.В. Зубов ◽  
С.П. Лебедев ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Atomic Force Microscope ◽  
Terahertz Radiation ◽  
Near Field ◽  
Experimental Results ◽  
Field Interaction ◽  
Atomic Force ◽  
Scattering Spectra

The experimental results of scattering and near-field interaction of a terahertz electromagnetic field with graphene ribbons near a metal probe of an atomic force microscope are reported. The amplification of a near-field terahertz scattering in ribbons is shown in comparison with unstructured graphene. The appearance of resonance peaks in the range 0.2–1.6 THz in the scattering spectra of terahertz radiation on graphene ribbons in the presence of a probe was detected, which is possibly due to the interaction of radiation with plasmons in the ribbons.

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.

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements
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