Fabrication of Various Plasmonic Nano-aperture Platforms with a ~10 nm Width

2020 ◽  
Author(s):  
Seong Soo Choi ◽  
Kyoung Jin Kim ◽  
Myoung Jin Park ◽  
Byung Seong Bae ◽  
Yong-Min Lee ◽  
...  
Keyword(s):  
Electron Beam ◽  
Single Molecule ◽  
Thermal Emission ◽  
Ion Beam ◽  
High Energy ◽  
Infrared Emission ◽  
Au Nanoparticle ◽  
Beam Current Density ◽  
Electron Beam Current ◽  
Emission Device

We fabricated the nano-aperture plasmonic platforms for single molecule detection and other various applications such as infrared thermal emission device. The nano-apertures including the nanopores on the pyramid, and the nano-slits on the Au flat membrane were fabricated using a Ga ion focused ion beam drilling technique, followed by high energy electron beam irradiations dependent upon the electron beam current density. The nanopores with a few nanometer size and the nanoslit array with order of ~ 100 nm width were fabricated. Optical characteristics for the various nanoslits were examined dependent upon the slit opening width and sample thickness. The broad emission spectra from the (7x 7) slit array are obtained from spp-mediated emission in the visible and infrared region. A sharp strong infrared emission peak is also obtained due to Au nanoparticle. The fabricated Au platform can be utilized as single molecule sensor and infrared thermal emission device.

scholarly journals Toward Next Generation Plasmonic Nanopore Slit Platform with a ~10 nm Slit-Width

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Seong Soo Choi ◽  
◽  
Byung Seong Bae ◽  
Kyoung Jin Kim ◽  
Myoug Jin Park ◽  
...  
Keyword(s):  
Electron Beam ◽  
Single Molecule ◽  
Focused Ion Beam ◽  
Thermal Emission ◽  
Ion Beam ◽  
High Energy ◽  
Infrared Emission ◽  
Au Nanoparticle ◽  
Beam Current Density ◽  
Electron Beam Current

We fabricated various nanoaperture plasmonic platforms for single-molecule detection. We fabricated nanoapertures like nanopores on a pyramid and nanoslits on an Au flat membrane using a Ga ion focused ion beam drilling technique, followed by irradiating with a high energy electron beam, dependent on the electron beam current density to obtain nanoapertures with a few nanometer sizes (circular nanopore, nanoslit pores). We examined their optical characteristics with varying aperture sizes and sample thicknesses. We obtained broad emission spectra in the visible and infrared region from the (7 x 7) slit array and a sharp, strong infrared emission peak from the Au nanoparticle on the substrate. The fabricated Au platform with ~10 nm nanometer opening can be employed as a single-molecule sensor and an infrared thermal emission device.

scholarly journals NUMERICAL ANALYSIS OF LASING DYNAMICS IN VOLUME FREE ELECTRON LASER

2008 ◽  
Vol 13 (2) ◽  
pp. 263-273
Author(s):  
Svetlana Sytova
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Initial Conditions ◽  
Beam Current ◽  
Beam Current Density ◽  
Electron Beam Current ◽  
Nonlinear Phenomena ◽  
Experimental Development ◽  
Lasing Dynamics

Nonlinear phenomena originating in volume free electron laser (VFEL) are investigated by methods of mathematical modelling using computer code VOLC. It was demonstrated the possibility of excitation of quasiperiodic oscillations not far from threshold values of electron beam current density and VFEL resonator length. It was investigated sensibility of numerical solution to initial conditions for different VFEL regimes of operation. Parametric maps with respect to electron beam current and detuning from synchronism condition present complicated root to chaos with windows of periodicity in VFEL. Investigation of chaotic lasing dynamics in VFEL is important in the light of experimental development of VFEL in Research Institute for Nuclear Problems.

scholarly journals High Density Static Charges Governed Surface Activation for Long-Range Motion and Subsequent Growth of Au Nanocrystals

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 328
Author(s):  
Guoxin Chen ◽  
Changjin Guo ◽  
Yao Cheng ◽  
Huanming Lu ◽  
Junfeng Cui ◽  
...  
Keyword(s):  
Electron Beam ◽  
Crystal Growth ◽  
Long Range ◽  
Electron Beam Irradiation ◽  
Diffusion Mechanism ◽  
High Energy ◽  
Lattice Diffusion ◽  
Au Nanoparticle ◽  
Surface Activation ◽  
Beam Irradiation

How a heavily charged metal nanocrystal, and further a dual-nanocrystals system behavior with continuous electron charging? This refers to the electric dynamics in charged particles as well as the crystal growth for real metal particles, but it is still opening in experimental observations and interpretations. To this end, we performed an in-situ electron-beam irradiation study using transmission electron microscopy (TEM) on the Au nanocrystals that freely stand on the nitride boron nanotube (BNNT). Au nanocrystalline particles with sizes of 2–4 nm were prepared by a well-controlled sputtering method to stand on the BNNT surface without chemical bonding interactions. Au nanoparticles presented the surface atomic disorder, diffusion phenomena with continuous electron-beam irradiation, and further, the long-range motion that contains mainly the three stages: charging, activation, and adjacence, which are followed by final crystal growth. Firstly, the growth process undergoes the lattice diffusion and subsequently the surface-dominated diffusion mechanism. These abnormal phenomena and observations, which are fundamentally distinct from classic cases and previous reports, are mainly due to the overcharging of Au nanoparticle that produces a surface activation state in terms of high-energy plasma. This work therefore brings about new observations for both a single and dual-nanocrystals system, as well as new insights in understanding the resulting dynamics behaviors.

scholarly journals Time behavior of an electron beam current pulse in the axial and peripheral zones of an anode in vacuum and gas-filled diodes

2021 ◽  
Vol 2064 (1) ◽  
pp. 012031
Author(s):  
D A Sorokin ◽  
M I Lomaev ◽  
A V Dyatlov ◽  
V F Tarasenko
Keyword(s):  
Electron Beam ◽  
Current Pulse ◽  
Current Density ◽  
Beam Current ◽  
Beam Current Density ◽  
Electron Beam Current ◽  
Time Behavior ◽  
Beam Current Pulse ◽  
Axial Part ◽  
A Current

Abstract The study of the time behavior of a current pulse of an electron beam generated during a high-voltage nanosecond discharge in gas-filled and vacuum diodes has been carried out. As follows from the experimental results, in both cases, the distribution of the beam current density in the plane of a grounded anode is non-uniform. The highest beam current density is recorded in the axial part of the anode. It was established that in the case of a gas-filled diode, ~ 2 ns after the onset of the beam current pulse, its shape in the axial anode zone changes relative to that in the peripheral one. It is assumed that the most probable reason for this is the effect of compensation of the charge of the beam electrons by the positive charge of ions arising in the ionization process in the paraxial zone.

Shrinking Graphene Nanopore Using Electron-Beam-Induced Deposition for Single Molecule Detection

2015 ◽  
Author(s):  
Jian Ma ◽  
Weiwei Zhao ◽  
Lei Liu ◽  
Jingjie Sha ◽  
Yunfei Chen
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Solid State ◽  
Single Molecule ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Single Molecule Detection ◽  
Large Size ◽  
Scanning Electron ◽  
Graphene Nanopore

Solid-state nanopore has already shown success of single molecule detection and graphene nanopore is potential for successful DNA sequencing. Here, we present a fast and controllable way to fabricate sub-5 nm nanopore on graphene membrane. The process includes two steps: sputtering a large size nanopore using a conventional focused ion beam (FIB) and shrinking the large nanopore to a few nanometers using scanning electron microscope (SEM). We also demonstrated the ability of the graphene nanopores fabricated in this manner to detect individual 48Kbp λ-DNA molecules.

scholarly journals Electrical Characterization of Defects Introduced in n-Type N-Doped 4H-SiC during Electron Beam Exposure

2015 ◽  
Vol 242 ◽  
pp. 427-433 ◽  
Author(s):  
Ezekiel Omotoso ◽  
Walter Ernst Meyer ◽  
Francois Danie Auret ◽  
Sergio Manuel Martins Coelho ◽  
Phuti Ngako Mahloka Ngoepe
Keyword(s):  
Electron Beam ◽  
Deep Level ◽  
Electrical Characterization ◽  
Beam Current ◽  
High Energy ◽  
Electron Beam Evaporation ◽  
High Energy Particle ◽  
Electron Beam Current ◽  
Intrinsic Nature ◽  
Carbon Vacancy

Deep level transient spectroscopy (DLTS) was used to characterize the defects introduced in n-type, N-doped, 4H-SiC while being exposed to electron beam evaporation conditions. This was done by heating a tungsten source using an electron beam current of 100 mA, which was not sufficient to evaporate tungsten. Two new defects were introduced during the exposure of 4H-SiC samples to electron beam deposition conditions (without metal deposition) after resistively evaporated nickel Schottky contacts. We established the identity of these defects by comparing their signatures to those of high energy particle irradiation induced defects of the same materials. The defect E0.42 had acceptor-like behaviour and could be attributed to be a silicon or carbon vacancy. The E0.71 had intrinsic nature and was linked to a carbon vacancy and/or carbon interstials.

Electron and Focused Ion Beams in Thermal Science and Engineering

2008 ◽  
Author(s):  
Tae-Youl Choi ◽  
Dimos Poulikakos
Keyword(s):  
Electron Beam ◽  
Heavy Ions ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
High Energy ◽  
Ion Beams ◽  
Focused Ion Beams ◽  
Deposition Method ◽  
Science And Engineering ◽  
Nanoscale Structures

Focused-ion-beam (FIB) is a useful tool for defining nanoscale structures. High energy heavy ions inherently exhibit destructive nature. A less destructive tool has been devised by using electron beam. FIB is mainly considered as an etching tool, while electron beam can be used for deposition purpose. In this paper, both etching and deposition method are demonstrated for applications in thermal science. Thermal conductivity of nanostructures (such as carbon nanotubes) was measured by using the FIB (and electron beam) nanolithography technique. Boiling characteristics was studied in a submicron heater that could be fabricated by using FIB.

scholarly journals Создание пористых слоев германия имплантацией ионами серебра

2018 ◽  
Vol 44 (8) ◽  
pp. 84
Author(s):  
А.Л. Степанов ◽  
В.В. Воробьев ◽  
В.И. Нуждин ◽  
В.Ф. Валеев ◽  
Ю.Н. Осин
Keyword(s):  
Ion Beam ◽  
Silver Ions ◽  
Average Diameter ◽  
Beam Current ◽  
High Energy ◽  
Beam Current Density ◽  
High Dose ◽  
X Ray ◽  
Force Microscopy ◽  
20 Nm

AbstractWe propose a method for the formation of porous germanium ( P -Ge) layers containing silver nanoparticles by means of high-dose implantation of low-energy Ag^+ ions into single-crystalline germanium ( c -Ge). This is demonstrated by implantation of 30-keV Ag^+ ions into a polished c -Ge plate to a dose of 1.5 × 10^17 ion/cm^2 at an ion beam-current density of 5 μA/cm^2. Examination by high-resolution scanning electron microscopy (SEM), atomic-force microscopy (AFM), X-ray diffraction (XRD), energy-dispersive X-ray (EDX) microanalysis, and reflection high-energy electron diffraction (RHEED) showed that the implantation of silver ions into c -Ge surface led to the formation of a P -Ge layer with spongy structure comprising a network of interwoven nanofibers with an average diameter of ∼10–20 nm Ag nanoparticles on the ends of fibers. It is also established that the formation of pores during Ag^+ ion implantation is accompanied by effective sputtering of the Ge surface.

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