Results 51 to 60 of about 524,666 (307)

Frequency comb generation threshold via second-harmonic excitation in χ(2) optical microresonators

APL Photonics, 2020
We investigate the threshold of χ(2) frequency comb generation in lithium niobate whispering gallery microresonators theoretically and experimentally. When generating a frequency comb via second-harmonic excitation, also commonly known as second-harmonic
Jan Szabados, Boris Sturman, Ingo Breunig   +2 more
doaj   +1 more source

Design and analysis strategies for robust microbiome ageing research

FEBS Letters, EarlyView.
The gut microbiome changes with age and associates with age‐related morbidity and mortality, establishing it as a potential biomarker and intervention target for ageing. Realising this potential requires methodological rigour, yet distinguishing biological signals from methodological artefacts remains challenging across cohorts. This review provides an
Mark Olenik, İsmail Güderer, Yi Wang, Tayyaba Alvi, Prasoon Pandey, Handan Melike Dönertaş   +5 more
wiley   +1 more source

Second Harmonic Generation in a Photonic Crystal [PDF]

Optics and Photonics News, 1997
Phase matched second harmonic generation is observed experimentally in a centrosymmetric crystalline lattice of dielectric spheres of optical dimensions. The inversion symmetry is broken locally at the surface of each sphere in such a way that the scattered second harmonic light interferes constructively leading to a nonvanishing macroscopic field ...
Martorell, Jordi, Vilaseca, Ramon, Corbalán, Ramón, American Physical Society   +3 more
openaire   +2 more sources

Microbiome‐blood–brain barrier interactions in aging — mechanisms and therapeutic potential

FEBS Letters, EarlyView.
Aging reshapes the gut microbiome (↓SCFA‐producing commensals; ↑pro‐inflammatory outputs), shifting circulating metabolites (↓SCFAs; ↑LPS, ↑TMAO, ↑PAA) that act at the BBB to increase nonspecific transcytosis, alter transport, and promote astrocyte reactivity, heightening brain vulnerability.
Daniel Cuervo‐Zanatta, Hari Baskar Balasubramanian, Amir Pasokh, Marietta Zille   +3 more
wiley   +1 more source

Optical Second Harmonic Generation of Low-Dimensional Semiconductor Materials

Nanomaterials
In recent years, the phenomenon of optical second harmonic generation (SHG) has attracted significant attention as a pivotal nonlinear optical effect in research. Notably, in low-dimensional materials (LDMs), SHG detection has become an instrumental tool
Yue Fu, Zhengyan Liu, Song Yue, Kunpeng Zhang, Ran Wang, Zichen Zhang   +5 more
doaj   +1 more source

Conservation laws of generalized angular momentum by second-harmonic generation in underdense plasmas harmonic generation [PDF]

EPJ Web of Conferences
Light beams exhibit two intrinsic quantized degrees of freedom: spin angular momentum (SAM) and orbital angular momentum (OAM) whose manipulation enables precise control over the topological characteristics of electromagnetic fields. Recently, structured
Voisine Alexis, Béjot Pierre, Billard Franck, Marroux Hugo, Faucher Olivier, Hertz Edouard   +5 more
doaj   +1 more source

Second-harmonic generation of temporally low-coherence light

APL Photonics, 2020
In this Letter, we study the second-harmonic (SH) generation of temporally low-coherence light using the statistical optics method. By introducing the statistical characteristics of low-coherence light into the nonlinear coupled wave equation, we predict
Xiaohui Zhao, Lailin Ji, Dong Liu, Yanqi Gao, Daxing Rao, Yong Cui, Wei Feng, Fujian Li, Haitao Shi, Chong Shan, WeiXin Ma, Zhan Sui   +11 more
doaj   +1 more source

Loss of IGF‐1R impairs DNA‐PKcs recruitment to chromatin leading to defective end‐joining

Molecular Oncology, EarlyView.
IGF‐1R promotes radioresistance by facilitating DNA‐PKcs recruitment to chromatin, enabling non‐homologous end‐joining (NHEJ) repair of double‐strand breaks. Inhibition or loss of IGF‐1R disrupts this recruitment to damage sites, driving compensatory reliance on microhomology‐mediated end‐joining (MMEJ) repair.
Matthew O. Ellis, Jack V. Mills, Wojciech Niedzwiedz, Valentine M. Macaulay   +3 more
wiley   +1 more source

Super/subradiant second harmonic generation [PDF]

Laser Physics Letters, 2017
A scheme for active second harmonics generation is suggested. The system comprises $N$ three-level atoms in ladder configuration, situated into resonant cavity. It is found that the system can lase in either superradiant or subradiant regime, depending on the number of atoms $N$.
Koganov, Gennady A., Shuker, Reuben
openaire   +2 more sources

Anapoles in Free-Standing III-V Nanodisks Enhancing Second-Harmonic Generation. [PDF]

Nano letters (Print), 2018
Nonradiating electromagnetic configurations in nanostructures open new horizons for applications due to two essential features: a lack of energy losses and invisibility to the propagating electromagnetic field.
M. Timofeeva, L. Lang, F. Timpu, C. Renaut, A. Bouravleuv, I. Shtrom, G. Cirlin, R. Grange   +7 more
semanticscholar   +1 more source