Molecular saturation determines distinct plasmonic enhancement scenarios for two-photon absorption signal by Saeid Izadshenas Jahromi, Karolina Słowik

Subjects: “…Two-photon absorption…”
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Defect state enhanced nonlinear absorption and optical limiting behaviour of erbium doped silver molybdate nanostructures by B. Binish, K. Mani Rahulan, T. C. Sabari Girisun, Nisha S. Panicker

Subjects: “…Two-photon absorption…”
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Dye-based fluorescent organic nanoparticles made from polar and polarizable chromophores for bioimaging purposes: a bottom-up approach by Daniel, Jonathan, Dal Pra, Ophélie, Kurek, Eleonore, Grazon, Chloé, Blanchard-Desce, Mireille

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Silicon Nitride Spot-Size Converter with Coupling Loss < 1.5 dB for Both Polarizations at 1W Optical Input by Enge Zhang, Yu Zhang, Lei Zhang, Xu Yang

“…However, conventional silicon spot-size converters (SSCs) are susceptible to high optical power due to the two-photon absorption (TPA) effect. To overcome this, we introduce a silicon nitride (SiN) SSC fabricated on a silicon-on-insulator (SOI) substrate. …”
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On the Primary Ionization Mechanism(s) in Matrix-Assisted Laser Desorption Ionization by Laura Molin, Roberta Seraglia, Zbigniew Czarnocki, Jan K. Maurin, Franciszek A. Pluciński, Pietro Traldi

“…The laser irradiation leads to the cleavage of these hydrogen bonds, and theoretical calculations show that both [Ma+H]+ and [Ma-H]- ions can be formed through a two-photon absorption process. Alternatively, by the absorption of one photon only, a heterodissociation of one of the O–H bonds can lead to a stable structure containing both cationic and anionic sites. …”
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Third-Order Nonlinear Optical Behavior of Novel Polythiophene Derivatives Functionalized with Disperse Red 19 Chromophore by Marilú Chávez-Castillo, Arelis Ledesma-Juárez, Marisol Güizado-Rodríguez, Jesús Castrellón-Uribe, Gabriel Ramos-Ortiz, Mario Rodríguez, José-Luis Maldonado, Jorge-Antonio Guerrero-Álvarez, Victor Barba

“…In solution, the copolymers exhibited similar two-photon absorption cross sections σ2PA with a maximum value of 8545 GM and 233 GM (1 GM = 10−50 cm4 s) per repeated monomeric unit.…”
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Controlling the Crystallinity and Morphology of Bismuth Selenide via Electrochemical Exfoliation for Tailored Reverse Saturable Absorption and Optical Limiting by Hao Yan, Bingxue Li, Junjie Pan, Xuan Fang, Yongji Yu, Dengkui Wang, Dan Fang, Yanyan Zhan, Xiaohua Wang, Jinhua Li, Xiaohui Ma, Guangyong Jin

“…Electrons in these defect states can be excited to higher energy levels, thereby triggering excited-state and two-photon absorption, which strengthen RSA. Finally, with increasing the RSA, the optical limiting threshold of 2D Bi₂Se₃ can also be increased. …”
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Physicochemical and Luminescent Properties of Copolymers Composed of Three Monomers: Polythiophenes Based on 3-Hexylthiophene and 3,4-Ethylenedioxythiophene by Marco Antonio Ramírez-Gómez, Karla Karina Guzmán-Rabadán, Edgar González-Juárez, Marisol Güizado-Rodríguez, Gabriel Ramos-Ortiz, Jorge Enrique Alba-Rosales, Huehueteotl Panzo-Medrano, Victor Barba, Mario Rodríguez, José Luis Maldonado, Miguel Ángel Basurto-Pensado

“…Characterizations by 1H NMR, FT-IR, DSC-TGA, GPC, UV-vis, cyclic voltammetry, fluorescence quantum yield, excited state lifetime, and two-photon absorption cross-section were carried out. These polymers combined the physicochemical properties of EDOT and 3-HT, such as high electron density, high charge mobility, low oxidation potential, and good processability. …”
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Coherent Control of Single Molecules via Phase-Shaped Two-Photon Excitation at Room Temperature by Xin-peng Xu, Tobias M. Herkenrath, Ullrich Scherf, Richard Hildner

“…The experimental data are reproduced by a simple model that allows to directly retrieve the 2-photon absorption spectrum of each single molecule. Our coherent-control approach is a powerful and robust way to obtain spectral characteristics of higher excited states of single molecules and to manipulate the excited-state dynamics in condensed phase at room temperature. …”
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