Results 51 to 60 of about 16,116 (221)

Optical bistability in subwavelength apertures containing nonlinear media

, 2004
We develop a self-consistent method to study the optical response of metallic gratings with nonlinear media embedded within their subwavelength slits. An optical Kerr nonlinearity is considered. Due to the large E-fields associated with the excitation of
E. Popov, F. J. García-Vidal, J. A. Porto, L. Martín-Moreno, U. Schröter   +4 more
core   +1 more source

Hexagonal patterns in optical bistability [PDF]

Physical Review A, 1992
The mean-field model of optical bistability in a ring cavity is extended to include diffraction in two transverse dimensions. Nonlinear analysis in the neighborhood of the instability of the homogeneous solution indicates the formation of stable hexagonal patterns, and this is confirmed by numerical simulation, with reasonable quantitative agreement ...
Firth, WJ, Scroggie, AJ, McDonald, GS, Lugiato, LA   +3 more
openaire   +2 more sources

Solvent‐Free Thermal Defect Engineering in Molecular Frameworks With Volatile Linkers

Advanced Materials, EarlyView.
Thermal removal of neutral volatile linkers enables precise and solvent‐free generation of metal vacancies in MOFs. This strategy affords redox‐stable, coordinatively unsaturated FeII sites with tunable spin, ligand coordination, and catalytic behavior. The approach offers a general route to design defect‐functional materials through local coordination
Sonia Martínez‐Giménez, Alejandro Orellana‐Silla, Marta Galbiati, Efrén Navarro‐Moratalla, Luca Braglia, Sara Stolfi, José Antonio Real, Víctor Rubio‐Giménez, Sergio Tatay, Carlos Martí‐Gastaldo   +9 more
wiley   +1 more source

Cavity Nonlinear Optics at Low Photon Numbers from Collective Atomic Motion

, 2007
We report on Kerr nonlinearity and dispersive optical bistability of a Fabry-Perot optical resonator due to the displacement of ultracold atoms trapped within. In the driven resonator, such collective motion is induced by optical forces acting upon up to
Dan M. Stamper-Kurn, Kater W. Murch, Kevin L. Moore, L. Landau, P. R. Hemmer, R. W. Boyd, Subhadeep Gupta   +6 more
core   +1 more source

Ultralow Power Nonlinear Response in an Si Photonic Crystal Nanocavity

IEEE Photonics Journal, 2013
Optical nonlinear response and bistability behavior are observed in a fabricated silicon photonic crystal three defect-long (L3) nanocavity. The L3 cavity, which is coupled with a photonic crystal waveguide, has a quality factor of 60 000.
Yong Zhang, Danping Li, Cheng Zeng, Yu Shi, Zengzhi Huang, Jinzhong Yu, Jinsong Xia   +6 more
doaj   +1 more source

Spin‐Crossover Confinement in Mesoporous Matrices Enables Tunable Porosity for Molecular Sensing

Advanced Materials Interfaces, EarlyView.
The integration of hierarchically organized porous frameworks with spin‐crossover nanodomains enables cooperative interactions across multiple length scales. This hybrid design merges dynamic molecular switching with tunable porosity, yielding materials whose structural and functional responses are actively modulated by confinement and guest uptake ...
Lucia B. Pizarro, Matias Rafti, Annette Andrieu‐Brunsen, Marcelo Ceolín   +3 more
wiley   +1 more source

Light‐Programmable Interfaces: From Molecular Photoswitching to Adaptive Membrane Separations

Advanced Materials Interfaces, EarlyView.
This review advances an interface‐centered framework for light‐responsive membranes, linking molecular photoswitches (azobenzene (AZO), spiropyran (SP), diarylethene (DAE), donor–acceptor Stenhouse adducts (DASA), photoacid) to integration strategies in polymeric, porous, self‐assembled, and mixed‐matrix systems.
Liangliang Zhang, Senlin Gu, Jianyang Zhao, Xiaojuan Hao, Lu Hua Li, Jihua Li, Lingxue Kong   +6 more
wiley   +1 more source

Pattern Formation in Non‐Equilibrium Architected Materials

Advanced Materials Technologies, EarlyView.
This article demonstrates an artificial mechanical system ‐ a robotic metamaterial ‐ as an accessible and versatile platform within which to explore and prescribe the reaction‐diffusion driven pattern formation hitherto associated with comparatively less accessible and versatile non‐equilibrium biological and chemical systems.
Vinod Ramakrishnan, Michael J. Frazier
wiley   +1 more source

Intrinsic optical bistability of thin films of linear molecular aggregates: The one-exciton approximation [PDF]

, 2007
We perform a theoretical study of the nonlinear optical response of an ultrathin film consisting of oriented linear aggregates. A single aggregate is described by a Frenkel exciton Hamiltonian with uncorrelated on-site disorder.
Agranovich V. M., Benedict M. G., Hasegava A., Jasper Knoester, Joost A. Klugkist, Kobayashi T., Lidzey D. G., Lifshits I. M., Lifshits I. M., Spano F. C., Victor A. Malyshev   +10 more
core   +9 more sources

Enhanced Optical Bistability of a Metasurface Based on Asymmetrically Optimized Mirror-Induced Magnetic Anapole States

Applied Sciences
In the field of modern optical computing and communication, optical bistability plays a crucial role. With a weak third-order nonlinear coefficient, low switch thresholds of optical bistability from Si-based nanophotonic structures remain a challenge. In
Rui Xu, Sen Tian, Yujia Wen, Guoxiong Cai   +3 more
doaj   +1 more source