scholarly journals The resonant nonlinear scattering theory with bound states in the radiation continuum and the second harmonic generation

2013 ◽  
Author(s):  
Friends R. Ndangali ◽  
Sergei V. Shabanov
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Scattering Theory ◽  
Bound States ◽  
Second Harmonic ◽  
Nonlinear Scattering

Polarization Second Harmonic Generation Discriminates Between Fresh and Aged Starch-Based Adhesives Used in Cultural Heritage

2016 ◽  
Vol 22 (5) ◽  
pp. 1072-1083 ◽  
Author(s):  
Sotiris Psilodimitrakopoulos ◽  
Evaggelia Gavgiotaki ◽  
Kristallia Melessanaki ◽  
Vassilis Tsafas ◽  
George Filippidis
Keyword(s):  
High Resolution ◽  
Second Harmonic Generation ◽  
Cultural Heritage ◽  
Harmonic Generation ◽  
Biomedical Imaging ◽  
Second Harmonic ◽  
Heritage Conservation ◽  
Starch Granules ◽  
Nonlinear Scattering ◽  
Cultural Heritage Conservation

AbstractIn this work, we report that polarization second harmonic generation (PSHG) microscopy, commonly used in biomedical imaging, can quantitatively discriminate naturally aged from fresh starch-based glues used for conservation or restoration of paintings, works of art on paper, and books. Several samples of fresh and aged (7 years) flour and starch pastes were investigated by use of PSHG. In these types of adhesives, widely used in cultural heritage conservation, second harmonic generation (SHG) contrast originates primarily from the starch granules. It was found that in aged glues, the starch SHG effective orientation (SHG angle, θ) shifts to significantly higher values in comparison to the fresh granules. This shift is attributed to the different degree of granule hydration between fresh and aged adhesives. Thus noninvasive high-resolution nonlinear scattering can be employed to detect and quantify the degree of deterioration of restoration adhesives and to provide guidance toward future conservation treatments.

scholarly journals Significantly enhanced second-harmonic generations with all-dielectric antenna array working in the quasi-bound states in the continuum and excited by linearly polarized plane waves

Nanophotonics ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhanghua Han ◽  
Fei Ding ◽  
Yangjian Cai ◽  
Uriel Levy
Keyword(s):  
Second Harmonic Generation ◽  
Magnetic Dipole ◽  
Harmonic Generation ◽  
Bound States ◽  
Second Harmonic ◽  
Generation Efficiency ◽  
Second Harmonic Generation Efficiency ◽  
Linearly Polarized ◽  
Magnetic Dipole Resonances ◽  
The Continuum

AbstractThe recently emerging all-dielectric optical nanoantennas based on high-index semiconductors have proven to be an effective and low-loss alternative to metal-based plasmonic structures for light control and manipulations of light–matter interactions. Nonlinear optical effects have been widely investigated to employ the enhanced interactions between incident light and the dielectrics at the Mie-type resonances, and in particular magnetic dipole resonances, which are supported by the semiconductor. In this paper, we explore the novel phenomenon of bound states in the continuum supported by high-index semiconductor nanostructures. By carefully designing an array of nanodisk structures with an inner air slot as the defect, we show that a novel high quality-factor resonance achieved based on the concept of bound state in the continuum can be easily excited by the simplest linearly polarized plane wave at normal incidence. This resonance further enhances the interactions between light and semiconductors and boosts the nonlinear effects. Using AlGaAs as the nonlinear material, we demonstrate a significant increase in the second-harmonic generation efficiency, up to six orders of magnitude higher than that achieved by magnetic dipole resonances. In particular, a second-harmonic generation efficiency around 10% can be numerically achieved at a moderate incident pump intensity of 5 MW/cm2.

scholarly journals Continuous Wave Second Harmonic Generation Enabled by Quasi-Bound-States in the Continuum on Gallium Phosphide Metasurfaces

Nano Letters ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 8745-8751
Author(s):  
Aravind P. Anthur ◽  
Haizhong Zhang ◽  
Ramon Paniagua-Dominguez ◽  
Dmitry A. Kalashnikov ◽  
Son Tung Ha ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Bound States ◽  
Gallium Phosphide ◽  
Continuous Wave ◽  
Second Harmonic ◽  
The Continuum

Observation of highly efficient second-harmonic generation at the nanoscale driven by bound states in the continuum

2020 ◽  
Author(s):  
Kirill L. Koshelev ◽  
Sergey Kruk ◽  
Elizaveta Melik-Gaykazyan ◽  
Jae-Hyuck Choi ◽  
Andrey Bogdanov ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Bound States ◽  
Second Harmonic ◽  
Highly Efficient ◽  
The Continuum
Sign in / Sign up

Export Citation Format

Share Document