scholarly journals Continuously-tunable Cherenkov-radiation-based detectors via plasmon index control

Nanophotonics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1479-1489 ◽  
Author(s):  
Mehmet Günay ◽  
You-Lin Chuang ◽  
Mehmet Emre Tasgin
Keyword(s):  
Refractive Index ◽  
Continuous Medium ◽  
Cherenkov Radiation ◽  
High Density ◽  
Metal Nanostructures ◽  
Data Correction ◽  
Continuous Tuning ◽  
Slow Moving ◽  
Photonic States ◽  
Radiation Angle

AbstractA recent study [PRB 100, 075427 (2019)], finally, demonstrated the plasmon-analog of refractive index enhancement in metal nanostructures (MNSs), which has already been studied in atomic clouds for several decades. Here, we simply utilize this phenomenon for achieving continuously-tunable enhanced Cherenkov radiation (CR) in MNSs. Beyond enabling CR from slow-moving particles, or increasing its intensity, the phenomenon can be used in continuous-tuning of the velocity cutoff of particles contributing to CR. More influentially, this allows a continuously-tunable analysis of the contributing particles as if the data is collected from many different detectors, which enables data correction. The phenomenon can also be integrated into lattice MNSs, for continuous medium tuning, where a high density of photonic states is present and the threshold for the CR can even be lifted. Additionally, vanishing absorption can heal radiation angle distortion effects caused by the metallic absorption.

scholarly journals Improved Refractive Index-Sensing Performance of Multimode Fano-Resonance-Based Metal-Insulator-Metal Nanostructures

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2097
Author(s):  
Yuan-Fong Chou Chau ◽  
Chung-Ting Chou Chao ◽  
Siti Zubaidah Binti Haji Jumat ◽  
Muhammad Raziq Rahimi Kooh ◽  
Roshan Thotagamuge ◽  
...  
Keyword(s):  
Refractive Index ◽  
Plasmon Resonance ◽  
Fano Resonance ◽  
High Sensitivity ◽  
Metal Nanostructures ◽  
Refractive Index Sensor ◽  
Metal Insulator ◽  
Wide Range ◽  
Metal Insulator Metal ◽  
Mode 2

This work proposed a multiple mode Fano resonance-based refractive index sensor with high sensitivity that is a rarely investigated structure. The designed device consists of a metal–insulator–metal (MIM) waveguide with two rectangular stubs side-coupled with an elliptical resonator embedded with an air path in the resonator and several metal defects set in the bus waveguide. We systematically studied three types of sensor structures employing the finite element method. Results show that the surface plasmon mode’s splitting is affected by the geometry of the sensor. We found that the transmittance dips and peaks can dramatically change by adding the dual air stubs, and the light–matter interaction can effectively enhance by embedding an air path in the resonator and the metal defects in the bus waveguide. The double air stubs and an air path contribute to the cavity plasmon resonance, and the metal defects facilitate the gap plasmon resonance in the proposed plasmonic sensor, resulting in remarkable characteristics compared with those of plasmonic sensors. The high sensitivity of 2600 nm/RIU and 1200 nm/RIU can simultaneously achieve in mode 1 and mode 2 of the proposed type 3 structure, which considerably raises the sensitivity by 216.67% for mode 1 and 133.33% for mode 2 compared to its regular counterpart, i.e., type 2 structure. The designed sensing structure can detect the material’s refractive index in a wide range of gas, liquids, and biomaterials (e.g., hemoglobin concentration).

An alpha slow-moving high-density-lipoprotein subfraction in serum of a patient with radiation enteritis and peritoneal carcinosis.

1989 ◽  
Vol 35 (4) ◽  
pp. 674-678
Author(s):  
J Peynet ◽  
A Legrand ◽  
B Messing ◽  
F Thuillier ◽  
F Rousselet
Keyword(s):  
High Density Lipoprotein ◽  
Density Lipoprotein ◽  
Low Density Lipoproteins ◽  
High Density ◽  
Radiation Enteritis ◽  
Low Density ◽  
Peritoneal Carcinosis ◽  
Very Low Density Lipoproteins ◽  
Slow Moving

Abstract An alpha slow-moving high-density-lipoprotein (HDL) subfraction was seen in a patient presenting with radiation enteritis and peritoneal carcinosis, who was given long-term cyclic parenteral nutrition. This subfraction, observed in addition to normal HDL, was precipitated with low-density lipoproteins (LDL) and very-low-density lipoproteins (VLDL) by sodium phosphotungstate-magnesium chloride. The patient's serum lipoproteins were analyzed after fractionation by density gradient ultracentrifugation. The alpha slow-moving HDL floated in the ultracentrifugation subfractions with densities ranging from 1.028 to 1.084 kg/L, and their main apolipoproteins included apolipoprotein E in addition to apolipoprotein A-I. These HDL were larger than HDL2. The pathogenesis of this unusual HDL subfraction is hypothesized.

HIGH DENSITY REFRACTIVE INDEX OF XENON

1984 ◽  
Vol 45 (C8) ◽  
pp. C8-53-C8-56 ◽  
Author(s):  
J. P. Itie ◽  
R. Le Toullec
Keyword(s):  
Refractive Index ◽  
High Density

High-Density Near-Field Readout over 50 GB Capacity Using Solid Immersion Lens with High Refractive Index

2003 ◽  
Vol 42 (Part 1, No. 2B) ◽  
pp. 1101-1104 ◽  
Author(s):  
Masataka Shinoda ◽  
Kimihiro Saito ◽  
Takao Kondo ◽  
Tsutomu Ishimoto ◽  
Ariyoshi Nakaoki
Keyword(s):  
Refractive Index ◽  
Near Field ◽  
High Refractive Index ◽  
High Density ◽  
Solid Immersion Lens

scholarly journals Colloidal Photoluminescent Refractive Index Nanosensor Using Plasmonic Effects

2018 ◽  
Vol 232 (9-11) ◽  
pp. 1431-1441 ◽  
Author(s):  
Dmitry V. Guzatov ◽  
Sergey V. Gaponenko ◽  
Hilmi V. Demir
Keyword(s):  
Refractive Index ◽  
Ambient Medium ◽  
Metal Layer ◽  
Semiconductor Nanocrystals ◽  
Chemical Properties ◽  
Test Strip ◽  
Molecular Probes ◽  
Metal Nanostructures ◽  
Refractive Index Sensor ◽  
Colloidal Assembly

Abstract Fluorescence enhancement by metal nanostructures which is sensitive to refractive index n of an ambient medium is suggested as an operation principle of a novel refractive index sensor for liquids. Calculations are made for spherical and spheroidal Ag particles, and potential feasibility of sensitivity of the order of Δn=10−4 is demonstrated. Sensors of this type can be made fully colloidal with metal bodies deposited on a substrate or comprising a metal layer covering colloidal assembly of dielectric particles to serve as a test strip as well as placed on a fiber tip end to get local probing of refractive index in the tip-enhanced refractometry mode. Colloidal core-shell semiconductor nanocrystals may become the best candidates for this type of sensors whereas molecular probes may be affected by chemical properties of tested liquids.

Interaction of excitons with Cherenkov radiation in WSe2 beyond the non-recoil approximation

2021 ◽  
Author(s):  
Fatemeh chahshouri ◽  
Masoud Taleb ◽  
Florian diekmann ◽  
Kai Rossnagel ◽  
Nahid Talebi
Keyword(s):  
Refractive Index ◽  
Electron Beam ◽  
Cherenkov Radiation ◽  
High Refractive Index ◽  
High Yield ◽  
Particle Detection ◽  
Thick Sample ◽  
Accurate Design ◽  
Photon Interactions ◽  
Detection Mechanisms

Abstract Cherenkov radiation from electrons propagating in materials with a high refractive index have applications in particle-detection mechanisms and could be used for high-yield coherent electron beam-driven photon sources. However, the theory of the Cherenkov radiation has been treated up to now using the non-recoil approximation, which neglects the effect of electron deceleration in materials. Here, we report on the effect of electron-beam deceleration on the radiated spectrum and exciton-photon interactions in nm-thick 〖WSe〗_2 crystals. The calculation of the Cherenkov radiation is performed by simulating the kinetic energy of an electron propagating in a thick sample using the Monto Carlo method combined with the Lienard-Wiechert retarded potential. Using this approach, we numerically investigate the interaction between the excitons and generated photons (Cherenkov radiation) beyond the non-recoil approximation and are able to reproduce experimental cathodoluminescence spectra. Our findings pave the way for an accurate design of particle scintillators and detectors, based on the strong-coupling phenomenon.

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