scholarly journals Directional color routing assisted by switchable Fano resonance in bimetallic metagrating

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Feifei Liu ◽  
Meng Wang ◽  
Xinping Zhang
Keyword(s):  
Fano Resonance ◽  
Slab Waveguide ◽  
Wave Transformation ◽  
Practical Application ◽  
Central Wavelength ◽  
Fundamental Limitations ◽  
Plasmon Resonances ◽  
Great Progress ◽  
Bimetallic Nanostructures ◽  
Phase Accumulation

Abstract Great progress in nanophotonics has been demonstrated in tailoring the impinging beams. The physics behind those intriguing effects is to a large extent governed by the parameter of the optical phase. While, simple nanostructures usually suffer from fundamental limitations on their efficiency in wave transformation, especially in the transmission system, associated with their inadequate phase accumulation, challenge their implementation in practical application. Here, we describe a transparent nanostructure built from a pair of partially overlapped gold and aluminum semi-nanoshells that show almost π phase accumulation through material-dependent plasmon resonances. Combined with an optical slab waveguide, the bimetallic metagratings exhibit prominent directional color routing properties in transmission light, which result from switchable Fano resonances between plasmon resonances of bimetallic nanostructures and ±1 order waveguide diffraction modes at two opposite oblique incidences due to sufficient phase shift provided by the asymmetric and bimetallic plasmon resonators. Both theoretical and experimental results show that the Fano-resonance-assisted color routing exhibits a relatively broadband tuning range (∼150 nm with an efficiency of up to 50%) and a color routing efficiency of up to 70% at the central wavelength of λ = 600 nm.

scholarly journals Tuning the Fano Resonance Between Localized and Propagating Surface Plasmon Resonances for Refractive Index Sensing Applications

Plasmonics ◽  
2013 ◽  
Vol 8 (3) ◽  
pp. 1379-1385 ◽  
Author(s):  
Kristof Lodewijks ◽  
Jef Ryken ◽  
Willem Van Roy ◽  
Gustaaf Borghs ◽  
Liesbet Lagae ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Fano Resonance ◽  
Surface Plasmon Resonances ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Plasmon Resonances

scholarly journals Security monitor inlining and certification for multithreaded Java

2014 ◽  
Vol 25 (3) ◽  
pp. 528-565 ◽  
Author(s):  
MADS DAM ◽  
BART JACOBS ◽  
ANDREAS LUNDBLAD ◽  
FRANK PIESSENS
Keyword(s):  
Security Policy ◽  
Security Policies ◽  
Policy Enforcement ◽  
Practical Application ◽  
Aspect Oriented Programming ◽  
Application Security ◽  
Fundamental Limitations ◽  
Java Bytecode ◽  
Verification Problem ◽  
Security Monitor

Security monitor inlining is a technique for security policy enforcement whereby monitor functionality is injected into application code in the style of aspect-oriented programming. The intention is that the injected code enforces compliance with the policy (security), and otherwise interferes with the application as little as possible (conservativity and transparency). Such inliners are said to be correct. For sequential Java-like languages, inlining is well understood, and several provably correct inliners have been proposed. For multithreaded Java one difficulty is the need to maintain a shared monitor state. We show that this problem introduces fundamental limitations in the type of security policies that can be correctly enforced by inlining. A class of race-free policies is identified that precisely characterizes the inlineable policies by showing that inlining of a policy outside this class is either not secure or not transparent, and by exhibiting a concrete inliner for policies inside the class which is secure, conservative and transparent. The inliner is implemented for Java and applied to a number of practical application security policies. Finally, we discuss how certification in the style of proof-carrying code could be supported for inlined programs by using annotations to reduce a potentially complex verification problem for multithreaded Java bytecode to sequential verification of just the inlined code snippets.

Strongly correlated plexcitonics: evolution of the Fano resonance in the presence of Kondo correlations

2015 ◽  
Vol 17 (17) ◽  
pp. 11569-11576 ◽  
Author(s):  
A. Goker
Keyword(s):  
Diatomic Molecule ◽  
Fano Resonance ◽  
Metallic Nanoparticles ◽  
Strongly Correlated ◽  
Plasmon Resonances

We investigate the Fano resonance for a Coulomb blockaded excitonic diatomic molecule coupled to metallic nanoparticles possessing plasmon resonances.

scholarly journals 5G Mobile Communication Development Trend and Several Key Technologies

2018 ◽  
Vol 246 ◽  
pp. 03034
Author(s):  
Liping Zheng
Keyword(s):  
Mobile Communication ◽  
Communication System ◽  
Development Trend ◽  
Practical Application ◽  
Application Process ◽  
Theoretical Support ◽  
Key Technologies ◽  
Great Progress ◽  
Overall Performance ◽  
5G Mobile Communication

The overall performance of 5G mobile communication network has made great progress compared with 4G network. In order to ensure the expected utility of 5G communication system in practical application, this paper will focus on the future development trend of this communication system and its research on key technologies involved in the application process to provide theoretical support to relevant practitioners.

scholarly journals Tunable Fano Resonance and Enhanced Sensing in a Simple Au/TiO2 Hybrid Metasurface

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 687 ◽  
Author(s):  
Zhihui He ◽  
Weiwei Xue ◽  
Wei Cui ◽  
Chunjiang Li ◽  
Zhenxiong Li ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Fano Resonance ◽  
Fdtd Simulation ◽  
Fano Resonances ◽  
Local Surface ◽  
Surface Plasmon Resonances ◽  
Coupled Mode ◽  
Plasmon Resonances ◽  
Refractive Index Sensors ◽  
Plasmon Polaritons

We investigate Fano resonances and sensing enhancements in a simple Au/TiO2 hybrid metasurface through the finite-different time-domain (FDTD) simulation and coupled mode theory (CMT) analysis. The results show that the Fano resonance in the proposed simple metasurface is caused by the destructive interaction between the surface plasmon polaritons (SPPs) and the local surface plasmon resonances (LSPRs), the quality factor and dephasing time for the Fano resonance can be effectively tuned by the thickness of Au and TiO2 structures, the length of each unit in x and y directions, as well as the structural defect. In particular, single Fano resonance splits into multiple Fano resonances caused by a stub-shaped defect, and multiple Fano resonances can be tuned by the size and position of the stub-shaped defect. Moreover, we also find that the sensitivity in the Au/TiO2 hybrid metasurface with the stub-shaped defect can reach up to 330 nm/RIU and 535 nm/RIU at the Fano resonance 1 and Fano resonance 2, which is more than three times as sensitive in the Au/TiO2 hybrid metasurface without the stub-shaped defect, and also higher than that in the TiO2 metasurface reported before. These results may provide further understanding of Fano resonances and guidance for designing ultra-high sensitive refractive index sensors.

scholarly journals Subwavelength-Diameter Silica Wire and Photonic Crystal Waveguide Slow Light Coupling

2007 ◽  
Vol 2007 ◽  
pp. 1-5 ◽  
Author(s):  
Ziyang Zhang ◽  
Ulf Andersson ◽  
Min Qiu
Keyword(s):  
Photonic Crystal ◽  
Slow Light ◽  
Power Transmission ◽  
Coupling Efficiency ◽  
Three Dimensional ◽  
Slab Waveguide ◽  
Photonic Crystal Waveguide ◽  
Central Wavelength ◽  
Lattice Constants ◽  
Light Region

Counter-directional coupling between subwavelength-diameter silica wire and single-line-defect two-dimensional photonic crystal slab waveguide is studied numerically using parallel three-dimensional finite-different time-domain method. By modifying silica wire properties or engineering photonic crystal waveguide dispersion band, the coupling central wavelength can be moved to the slow light region and the coupling efficiency improves simultaneously. One design gives 82% peak power transmission from silica wire to photonic crystal waveguide over an interacting distance of 50 lattice constants. The group velocity is estimated as 1/35 of light speed in vacuum.

scholarly journals Plasmon coupling nanorice trimer for ultrahigh enhancement of hyper-Raman scattering

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shuangmei Zhu ◽  
Chunzhen Fan ◽  
Erjun Liang ◽  
Pei Ding ◽  
Xiguang Dong ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Fano Resonance ◽  
Hot Spot ◽  
Longitudinal Mode ◽  
Plasmon Coupling ◽  
Dark Mode ◽  
First Order ◽  
The Third ◽  
Surface Enhanced ◽  
Plasmon Resonances

AbstractA new tactic that using Ag nanorice trimer as surface-enhanced hyper Raman scattering substrate is proposed for realizing maximum signal enhancement. In this paper, we numerically simulate and theoretically analyze the optical properties of the nanorice trimer consisting of two short nanorices and a long nanorice. The Ag nanorice trimer can excite Fano resonance at optical frequencies based on the strong interaction between the bright and the dark mode. The bright mode is attributed to the first longitudinal resonance of the short nanorice pair, while the dark mode originates from the third longitudinal mode resonance of the long nanorice. The electric field distributions demonstrate that the two resonances with the largest field strength correspond to the first-order resonance of the long nanorice and the Fano resonance of the trimer, respectively. Two plasmon resonances with maximum electromagnetic field enhancements and same spatial hot spot regions can match spectrally with the pump and second-order Stokes beams of hyper Raman scattering, respectively, through reasonable design of the trimer structure parameters. The estimated enhancement factor of surface-enhanced hyper Raman scattering can achieve as high as 5.32 × 1013.

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

Fifth Edition: the New Standard

2000 ◽  
Vol 5 (6) ◽  
pp. 1-7
Author(s):  
Christopher R. Brigham ◽  
James B. Talmage ◽  
Leon H. Ensalada
Keyword(s):  
Musculoskeletal System ◽  
Medical Information ◽  
Objective Assessment ◽  
Scientific Data ◽  
Practical Application ◽  
Fourth Edition ◽  
Appropriate Use ◽  
Medical Evaluation ◽  
Single Set

Abstract The AMA Guides to the Evaluation of Permanent Impairment (AMA Guides), Fifth Edition, is available and includes numerous changes that will affect both evaluators who and systems that use the AMA Guides. The Fifth Edition is nearly twice the size of its predecessor (613 pages vs 339 pages) and contains three additional chapters (the musculoskeletal system now is split into three chapters and the cardiovascular system into two). Table 1 shows how chapters in the Fifth Edition were reorganized from the Fourth Edition. In addition, each of the chapters is presented in a consistent format, as shown in Table 2. This article and subsequent issues of The Guides Newsletter will examine these changes, and the present discussion focuses on major revisions, particularly those in the first two chapters. (See Table 3 for a summary of the revisions to the musculoskeletal and pain chapters.) Chapter 1, Philosophy, Purpose, and Appropriate Use of the AMA Guides, emphasizes objective assessment necessitating a medical evaluation. Most impairment percentages in the Fifth Edition are unchanged from the Fourth because the majority of ratings currently are accepted, there is limited scientific data to support changes, and ratings should not be changed arbitrarily. Chapter 2, Practical Application of the AMA Guides, describes how to use the AMA Guides for consistent and reliable acquisition, analysis, communication, and utilization of medical information through a single set of standards.

Study of the Leakage Loss in a Silica-on-Silicon Slab Waveguide

2003 ◽  
Vol 22 (4) ◽  
pp. 249-261 ◽  
Author(s):  
JUN LU ◽  
SAILING HE ◽  
VLADIMIR ROMANOV
Keyword(s):  
Slab Waveguide ◽  
Leakage Loss ◽  
Silicon Slab
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