scholarly journals Tailoring the lineshapes of coupled plasmonic systems based on a theory derived from first principles

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Jing Lin ◽  
Meng Qiu ◽  
Xiyue Zhang ◽  
Huijie Guo ◽  
Qingnan Cai ◽  
...  
Keyword(s):  
First Principles ◽  
Near Infrared ◽  
Coupled System ◽  
Bound State ◽  
Radiative Loss ◽  
Dark Mode ◽  
Optical Responses ◽  
Theoretical Predictions ◽  
Mutual Relations ◽  
Infrared Frequencies

Abstract Coupled photonic systems exhibit intriguing optical responses attracting intensive attention, but available theoretical tools either cannot reveal the underlying physics or are empirical in nature. Here, we derive a rigorous theoretical framework from first principles (i.e., Maxwell’s equations), with all parameters directly computable via wave function integrations, to study coupled photonic systems containing multiple resonators. Benchmark calculations against Mie theory reveal the physical meanings of the parameters defined in our theory and their mutual relations. After testing our theory numerically and experimentally on a realistic plasmonic system, we show how to utilize it to freely tailor the lineshape of a coupled system, involving two plasmonic resonators exhibiting arbitrary radiative losses, particularly how to create a completely “dark” mode with vanishing radiative loss (e.g., a bound state in continuum). All theoretical predictions are quantitatively verified by our experiments at near-infrared frequencies. Our results not only help understand the profound physics in such coupled photonic systems, but also offer a powerful tool for fast designing functional devices to meet diversified application requests.

scholarly journals A Ternary Map of Ni–Mn–Ga Heusler Alloys from Ab Initio Calculations

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 973
Author(s):  
Yulia Sokolovskaya ◽  
Olga Miroshkina ◽  
Danil Baigutlin ◽  
Vladimir Sokolovskiy ◽  
Mikhail Zagrebin ◽  
...  
Keyword(s):  
First Principles ◽  
Predictive Power ◽  
Computational Study ◽  
Heusler Alloys ◽  
Functional Materials ◽  
Ternary Diagram ◽  
Compositional Stability ◽  
Theoretical Predictions ◽  
Simultaneous Stability ◽  
Tetragonal Martensite

In the search for new magnetic functional materials, non-stoichiometric compounds remain a relatively unexplored territory. While experimentalists create new compositions looking for improved functional properties, their work is not guided by systematic theoretical predictions. Being designed for perfect periodic crystals, the majority of first-principles approaches struggle with the concept of a non-stoichiometric system. In this work, we attempt a systematic computational study of magnetic and structural properties of Ni–Mn–Ga, mapped onto ternary composition diagrams. Compositional stability was examined using the convex hull analysis. We show that the cubic austenite has its stability region close to the stoichiometric Ni2MnGa, in agreement with experimental data, while the tetragonal martensite spreads its stability over a wider range of Mn and Ni contents. The unstable compositions in both austenite and martensite states are located in the Ga-rich corner of the ternary diagram. We note that simultaneous stability of the austenite and martensite should be considered for potentially stable compounds suitable for synthesis. The majority of compounds are predicted to be ferrimagnetically ordered in both austenitic and martensitic states. The methodology used in this work is computationally tractable, yet it delivers some predictive power. For experimentalists who plan to synthesize stable Ni–Mn–Ga compounds with ferromagnetic order, we narrow the target compositional range substantially.

Mechanisms of bismuth-activated near-infrared photoluminescence - a first-principles study on the MXCl3 series

2021 ◽  
Author(s):  
Qiaoling Chen ◽  
Weiguo Jing ◽  
Yau-Yuen Yeung ◽  
Min Yin ◽  
Chang-Kui Duan
Keyword(s):  
First Principles ◽  
Valence State ◽  
Near Infrared ◽  
Site Occupancy ◽  
First Principles Calculations ◽  
First Principles Study

Bismuth dopants have attracted intensive studies experimentally for their extremely broad nearinfrared luminescence. Here we performed first-principles calculations to investigate the site occupancy and valence state by taking the condition...

A series of terpyridine-based zinc(ii) complexes assembled for third-order nonlinear optical responses in the near-infrared region and recognizing lipid membranes

2017 ◽  
Vol 5 (31) ◽  
pp. 6348-6355 ◽  
Author(s):  
Yiwen Tang ◽  
Ming Kong ◽  
Xiaohe Tian ◽  
Jinghang Wang ◽  
Qingyuan Xie ◽  
...  
Keyword(s):  
Lipid Membranes ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Infrared Region ◽  
Biological Imaging ◽  
Tissue Penetration ◽  
Third Order ◽  
Two Photon ◽  
Optical Responses ◽  
Near Infrared Region

Two-photon (TP) microscopy has advantages for biological imaging in that it allows deeper tissue-penetration and excellent resolution compared with one-photon (OP) microscopy.

Generalized Darboux transformation and asymptotic analysis on the degenerate dark-bright solitons for a coupled nonlinear Schrödinger system

2021 ◽  
Author(s):  
He-yuan Tian ◽  
Bo Tian ◽  
Yan Sun ◽  
Su-Su Chen
Keyword(s):  
Asymptotic Analysis ◽  
Darboux Transformation ◽  
Coupled System ◽  
Bound State ◽  
Bright Soliton ◽  
Spectral Parameters ◽  
Nonlinear Superposition ◽  
Bright Solitons ◽  
Generalized Darboux Transformation ◽  
The Given

Abstract In this paper, our work is based on a coupled nonlinear Schr ̈odinger system in a two-mode nonlinear fiber. A (N,m)-generalized Darboux transformation is constructed to derive the Nth-order solutions, where the positive integers N and m denote the numbers of iterative times and of distinct spectral parameters, respectively. Based on the Nth-order solutions and the given steps to perform the asymptotic analysis, it is found that a degenerate dark-bright soliton is the nonlinear superposition of several asymptotic dark-bright solitons possessing the same profile. For those asymptotic dark-bright solitons, their velocities are z-dependent except that one of those velocities could become z-independent under the certain condition, where z denotes the evolution dimension. Those asymptotic dark-bright solitons are reflected during the interaction. When a degenerate dark-bright soliton interacts with a nondegenerate/degenerate dark-bright soliton, the interaction is elastic, and the asymptotic bound-state dark-bright soliton with z-dependent or z-independent velocity could take place under certain conditions. Our study extends the investigation on the degenerate solitons from the bright soliton case for the scalar equations to the dark-bright soliton case for a coupled system.

scholarly journals Ab initio design of light absorption through silver atomic cluster decoration of TiO2

2018 ◽  
Vol 20 (28) ◽  
pp. 19110-19119 ◽  
Author(s):  
María Pilar de Lara-Castells ◽  
Carlos Cabrillo ◽  
David A. Micha ◽  
Alexander O. Mitrushchenkov ◽  
Tijo Vazhappilly
Keyword(s):  
Ab Initio ◽  
Light Absorption ◽  
First Principles ◽  
Near Infrared ◽  
Silver Clusters ◽  
Atomic Cluster ◽  
Absorption Bands ◽  
First Principles Study

This first-principles study reveals how stable subnanometer silver clusters on a TiO2(110) surface lead to the onset of absorption bands in the near-infrared and visible regions.

Properties of Magnetic Features from the Analysis of Near-Infrared Spectral Lines

1994 ◽  
Vol 154 ◽  
pp. 393-405
Author(s):  
Sami K. Solanki
Keyword(s):  
Near Infrared ◽  
Velocity Structure ◽  
Spectral Lines ◽  
The Past ◽  
Diagnostic Potential ◽  
Theoretical Predictions ◽  
Infrared Spectral ◽  
Magnetic Features

An overview is given of the structure and the physics of magnetic features in solar plages, as derived from observations of near-infrared lines. First, the diagnostic potential of near-infrared lines is compared with that of lines in the visible and at 12 μm. Then, the results on the magnetic and velocity structure of magnetic features obtained from 1.5 μm lines are described, discussed and compared with results of observations in the visible and with theoretical predictions. Finally, the past and present achievements of near-infrared investigations of Zeeman-split lines are summarized.

scholarly journals Charge transfer plasmon resonances across silver–molecule–silver junctions: estimating the terahertz conductance of molecules at near-infrared frequencies

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70884-70894 ◽  
Author(s):  
Lin Wu ◽  
Shu Fen Tan ◽  
Michel Bosman ◽  
Joel K. W. Yang ◽  
Christian A. Nijhuis ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Space Charge ◽  
Near Infrared ◽  
Tunnel Junctions ◽  
Electromagnetic Model ◽  
Plasmon Resonances ◽  
Infrared Frequencies

Quantum plasmon resonances have been recently observed across molecular tunnel junctions. The present work extends these studies theoretically using a generalized space-charge corrected electromagnetic model for a wider range of molecules.

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