Unlocking coherent control of ultrafast plasmonic interaction

2021 ◽  
Author(s):  
Eyal Bahar ◽  
Uri Arieli ◽  
Maayan Vizner Stern ◽  
Suchowski Haim
Keyword(s):  
Coherent Control ◽  
Incident Beam ◽  
Ultrashort Pulses ◽  
Coherent Motion ◽  
Ultrafast Dynamics ◽  
Internal Phase ◽  
Equilibrium Response ◽  
Highly Nonlinear ◽  
The Common ◽  
Coherent Plasma

Abstract Striking a metallic nanostructure with a short and intense pulse of light excites a complex out-of-equilibrium distribution of electrons that rapidly interact and lose their mutual coherent motion. Due to the highly nonlinear dynamics, the photo-excited nanostructures may further emit energetic photons beyond the spectrum of the incident beam, where the shortest pulse duration is traditionally expected to induce the greatest nonlinear emission. Here, we coherently control these photo-induced extreme ultrafast dynamics by spectrally shaping a sub-10 fs pulse within the timescale of coherent plasmon excitations. Contrary to the common perception, we show that stretching the pulse to match its internal phase with the plasmon-resonance increases the second-order nonlinear emission by > 25%. The enhancement is observed only when shaping extreme-ultrashort pulses (< 20 fs), thus signifying the coherent electronic nature as a crucial source of the effect. We provide a detailed theoretical framework that reveals the optimal pulse shapes for enhanced nonlinear emission regarding the nanostructures’ plasmonic-resonances. The demonstrated truly-coherent plasma control paves the way to engineer rapid out-of-equilibrium response in solids state systems and light-harvesting applications.

Frequency dependence of the polar motion resonance

2019 ◽  
Vol 220 (2) ◽  
pp. 753-758 ◽  
Author(s):  
C Bizouard ◽  
I Nurul Huda ◽  
Y Ziegler ◽  
S Lambert
Keyword(s):  
Quality Factor ◽  
Polar Motion ◽  
Earth Tide ◽  
Chandler Wobble ◽  
Free Core Nutation ◽  
Pole Tide ◽  
Equilibrium Response ◽  
Geophysical Interpretation ◽  
The Common ◽  
Solid Earth Tide

SUMMARY The nutation of the Celestial Intermediate Pole can be considered as a retrograde diurnal polar motion. As the common polar motion, it presents a resonance, but with period TPM and quality factor QPM differing from the ones characterizing the Chandler wobble (TCW = 430.2−431.6 d, QCW in the interval (56 255) according to Nastula & Gross): according to the nutation analysis presented in a separate paper, this period is about TPM = 380 d and the quality factor becomes −10. In this study, we aim to revisit the geophysical interpretation of this result. Two complementary factors account for the observed values: the non-equilibrium response of the ocean to the pole tide potential in the diurnal band, and the resonance of the solid Earth tide at the free core nutation period. This leads to a resonance of TPM in the vicinity of the free core nutation period, confirmed by estimates derived from nutation analysis.

scholarly journals Nonlinear Phenomena of Ultra-Wide-Band Radiation in a Photonic Crystal Fibre

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Rim Cherif ◽  
Mourad Zghal
Keyword(s):  
Photonic Crystal ◽  
Pulse Propagation ◽  
Stimulated Raman Scattering ◽  
Ultrashort Pulses ◽  
Wide Band ◽  
Supercontinuum Generation ◽  
Ultra Wide Band ◽  
Nonlinear Phenomena ◽  
Photonic Crystal Fibre ◽  
Highly Nonlinear

We report the results of a numerical and experimental analysis of femtosecond pulse propagation in a highly nonlinear photonic crystal fibre (PCF). The propagation of ultrashort pulses in PCF is studied taking into account the effects of dispersion, self-phase modulation, stimulated Raman scattering, and self-steepening. The interaction between linear and nonlinear effects is investigated in order to better understand the interplay of these effects leading to the supercontinuum generation. The initial stage of an ultra-wide-band supercontinuum generation under femtosecond pumping is pointed out. Details about the expansion of the blue and red sides of the supercontinuum due to transfer of energy to dispersive waves are revealed and experimentally confirmed. Our experimental results are compared to numerical solution of the nonlinear Schrödinger equation. Good agreement is found.

Ultrafast dynamics and coherent control of parametric scattering of polaritons in microcavities

2003 ◽  
Author(s):  
Benoit Deveaud ◽  
Stefan Kundermann ◽  
Michele Saba ◽  
Jean Louis Staehli ◽  
Thierry Guillet
Keyword(s):  
Coherent Control ◽  
Ultrafast Dynamics ◽  
Parametric Scattering

Ultrashort pulses autocorrelator based on supercontinuum generation in highly nonlinear fibres

2018 ◽  
Vol 15 (9) ◽  
pp. 095104
Author(s):  
Sebastián Jarabo ◽  
Francisco Javier Salgado-Remacha ◽  
José Eduardo Saldaña-Díaz
Keyword(s):  
Ultrashort Pulses ◽  
Supercontinuum Generation ◽  
Highly Nonlinear

scholarly journals High Internal-Phase Pickering Emulsions Stabilized by Xanthan Gum/Lysozyme Nanoparticles: Rheological and Microstructural Perspective

2022 ◽  
Vol 8 ◽  
Author(s):  
Wei Xu ◽  
Zhifan Li ◽  
Haomin Sun ◽  
Shuqing Zheng ◽  
He Li ◽  
...  
Keyword(s):  
Xanthan Gum ◽  
Colloidal Particles ◽  
Physical Stability ◽  
Pickering Emulsions ◽  
High Concentration ◽  
Internal Phase ◽  
New Strategy ◽  
Emulsion Systems ◽  
The Common ◽  
First Time

Food-grade high internal-phase Pickering emulsions (HIPPEs) stabilized by solid or colloidal particles with different advantages have attracted extensive attention nowadays. However, looking for new appropriate particle stabilizers is the common practice for HIPPEs preparation. It is crucial to find a new strategy for the development of functional HIPPEs with controllable properties. In this study, a high concentration of xanthan gum/lysozyme nanoparticles (XG/Ly NPs) was used for the preparation of HIPPEs for the first time. Visual observations, creaming index (CI), microstructure, and rheology tests were carried out to investigate the potential of XG/Ly NPs as HIPPEs stabilizers. Results indicated that XG/Ly NPs could stabilize oil droplets in the concentration range of 0.5–4% (w/v). The HIPPEs with a minimal particle concentration of 1% exhibited remarkable physical stability. Rheological measurements showed that a high stability of solid-like HIPPEs was successfully obtained with a higher concentration of XG/Ly NPs. Overall, the HIPPEs stabilized by different concentrations of XG/Ly NPs exhibited excellent rheological and structural properties, which might provide a feasible strategy for the development of functional emulsion systems with controllable structures.

An Improvement of Probabilistic Feasible Region Method for Reliablity-Based Design Optimization

2020 ◽  
pp. 2140004
Author(s):  
Zihao Wu ◽  
Zhenzhong Chen ◽  
Ge Chen ◽  
Xiaoke Li ◽  
Xuehui Gan ◽  
...  
Keyword(s):  
Design Optimization ◽  
Reliability Analysis ◽  
Mathematical Problem ◽  
Sequential Optimization ◽  
Feasible Region ◽  
Boundary Problems ◽  
Reliability Based Design ◽  
Engineering Design Problem ◽  
Highly Nonlinear ◽  
The Common

The decoupled methods for reliability-based design optimization (RBDO) problems are efficient and accurate. Sequential optimization and reliability analysis (SORA) method and probabilistic feasible region (PFR) approach are typical decoupled methods. When there are multiple constraints in RBDO problem, PFR method improves the efficiency of solving this problem by establishing the PFR to reduce the number of unnecessary reliability analysis loops. If the constraint boundary is not fixed in RBDO problem, PFR method may fail to solve and give the wrong result. Based on PFR method, this paper proposed an improvement of PFR method to solve the unfixed constraint boundary problems. The improvement of PFR method may not be efficient as the PFR method in solving the common RBDO problems. But, the improvement of PFR method can solve the RBDO problem with unfixed constraint boundary and has better adaptability. Three applications, a nonlinear mathematical problem, a highly nonlinear mathematical problem and an engineering design problem, are presented to illustrate the accuracy of the improvement of PFR method.

Sign in / Sign up

Export Citation Format

Share Document