Ultranarrow-linewidth stimulated Brillouin scattering with fundamental acoustic waves by Wendao Xu, Maxime Zerbib, Arjun Iyer, Kien Phan Huy, Jean-Charles Beugnot, William H. Renninger

“…Stimulated Brillouin scattering is a well-known nonlinear optical interaction valued for applications including narrow-linewidth lasers, phase conjugation, sensing, and RF-signal processing such as delay lines and filters. …”
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Optical band gap modulation in functionalized chitosan biopolymer hybrids using absorption and derivative spectrum fitting methods: A spectroscopic analysis by Dyari M. Mamand, Dana S. Muhammad, Daron Q. Muheddin, Karzan A. Abdalkarim, Dana A. Tahir, Hawkar A. Muhammad, Shujahadeen B. Aziz, Sarkawt A. Hussen, Jamal Hassan

“…The dopped samples show an increase in their linear optical susceptibility, third-order nonlinear optical susceptibility and nonlinear refractive indices, changing from 3.165 × 10–15 to 2.831 × 10–12 esu. …”
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Roadmap for Designing Donor-<inline-formula><math display="inline"><semantics><mrow><mi mathvariant="bold-sans-serif">π</mi></mrow></semantics></math></inline-formula>-Acceptor Flu... by Guliz Ersoy, Maged Henary

“…These features make them good candidates for various applications such as bioimaging, photovoltaic devices and nonlinear optical materials. Upon excitation of the D-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">π</mi></mrow></semantics></math></inline-formula>-A fluorophore, intramolecular charge transfer (ICT) occurs, and it polarizes the molecule resulting in the ‘push–pull’ system. …”
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Green approach to synthesis polymer composites based on chitosan with desired linear and non-linear optical characteristics by Dyari M. Mamand, Sarkawt A. Hussen, Shujahadeen B. Aziz

“…The first-order nonlinear ( $$\:{\chi\:}^{\left(1\right)}$$ ), second-order non-linear ( $$\:{\chi\:}^{\left(2\right)}$$ ) and third-order nonlinear optical susceptibility ( $$\:{\chi\:}^{\left(3\right)}$$ ) were determined for all the films.…”
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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

“…Their luminescence can be tuned in the whole visible region down to the Near Infra-Red I (NIR-I) region while their nonlinear optical responses can be enhanced thanks to cooperative effects. …”
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