Results 51 to 60 of about 41,207 (287)

Silicon-nitride waveguides for on-chip Raman spectroscopy [PDF]

, 2014
The evanescent tail of the guided modes can efficiently excite Raman active molecules located in the cladding of a waveguide. Similarly, a significant fraction of the total emitted Stokes power is evanescently coupled to the same mode.
Baets, Roel, Dhakal, Ashim, Le Thomas, Nicolas, Peyskens, Frédéric, Subramanian, Ananth, Wuytens, Pieter   +5 more
core   +1 more source

Intermediate Resistive State in Wafer‐Scale Vertical MoS2 Memristors Through Lateral Silver Filament Growth for Artificial Synapse Applications

Advanced Functional Materials, EarlyView.
In MOCVD MoS2 memristors, a current compliance‐regulated Ag filament mechanism is revealed. The filament ruptures spontaneously during volatile switching, while subsequent growth proceeds vertically through the MoS2 layers and then laterally along the van der Waals gaps during nonvolatile switching.
Yuan Fa, Milan Buttberg, Ke Ran, Rana Walied Ahmad, Dennis Braun, Lukas Völkel, Jimin Lee, Sofía Cruces, Bart Macco, Bárbara Canto, Holger Lerch, Thorsten Wahlbrink, Holger Kalisch, Michael Heuken, Andrei Vescan, Joachim Mayer, Zhenxing Wang, Ilia Valov, Stephan Menzel, Max C. Lemme   +19 more
wiley   +1 more source

Analysis of Parameters for a Distributed Temperature Sensing based on Raman Scattering

Journal of Microwaves, Optoelectronics and Electromagnetic Applications
This paper presents a theoretical and computational study on the analysis of parameters for distributed temperature sensing in optical fibers, based on spontaneous Raman scattering effect. The parameters studied were the optical power level, the range of
Luís Cicero Bezerra da Silva, Maria José Pontes, Marcelo Eduardo Vieira Segatto   +2 more
doaj   +1 more source

Bio‐Inspired Molecular Events in Poly(Ionic Liquids)

Advanced Functional Materials, EarlyView.
Originating from dipolar and polar inter‐ and intra‐chain interactions of the building blocks, the topologies and morphologies of poly(ionic liquids) (PIL) govern their nano‐ and micro‐processibility. Modulating the interactions of cation‐anion pairs with aliphatic dipolar components enables the tunability of properties, facilitated by “bottom‐up ...
Jiahui Liu, Marek W. Urban
wiley   +1 more source

Temperature Dependence of Coherent versus Spontaneous Raman Scattering

Physical Review Letters
Due to their sub picosecond temporal resolution, coherent Raman spectroscopies have been proposed as a viable extension of Spontaneous Raman (SR) thermometry, to determine dynamics of mode specific vibrational energy content during out of equilibrium molecular processes.
Batignani, Giovanni, Mai, Emanuele, Martinati, Miles, Neethish, Mohanan Madathiparambil, Mukamel, Shaul, Scopigno, Tullio   +5 more
openaire   +4 more sources

Nonlinear behavior of vibrating molecules on suspended graphene waveguides

, 2012
Suspended graphene waveguides were deposited on micron-scale periodic metal (plasmonic) structures. Raman scattering of test molecules (B. Megaterium), deposited on the waveguides' surface, exhibited azimuthal cycles upon rotation: at these micron scales,
Amrita Banerjee, Banerjee, Banerjee, Geim, Haim Grebel, Layne, Li, Lin, Vakil   +8 more
core   +1 more source

A cold-atom random laser [PDF]

, 2013
Conventional lasers make use of optical cavities to provide feedback to gain media. Conversely, mirrorless lasers can be built by using disordered structures to induce multiple scattering, which increases the effective path length in the gain medium and ...
Baudouin, Quentin, Guarrera, Vera, Guerin, William, Kaiser, Robin, Mercadier, Nicolas   +4 more
core   +2 more sources

2D Magnetic and Topological Quantum Materials and Devices for Ultralow Power Spintronics

Advanced Functional Materials, EarlyView.
2D magnets and topological quantum materials enable ultralow‐power spintronics by combining robust magnetic order with symmetry‐protected, Berry‐curvature‐driven transport. Fundamentals of 2D anisotropy and spin‐orbit‐coupling induced band inversion are linked to scalable growth and vdW stacking.
Brahmdutta Dixit, Yifei Yang, Shawn Li, Yu‐Chia Chen, Qi Jia, Jian‐Ping Wang   +5 more
wiley   +1 more source

A novel non-imaging optics based Raman spectroscopy device for transdermal blood analyte measurement

AIP Advances, 2011
Due to its high chemical specificity, Raman spectroscopy has been considered to be a promising technique for non-invasive disease diagnosis. However, during Raman excitation, less than one out of a million photons undergo spontaneous Raman scattering and
Chae-Ryon Kong, Ishan Barman, Narahara Chari Dingari, Jeon Woong Kang, Luis Galindo, Ramachandra R. Dasari, Michael S. Feld   +6 more
doaj   +1 more source

Nanothermometry in Living Cells: Physical Limits, Conceptual and Material Challenges

Advanced Functional Materials, EarlyView.
Heat and temperature are fundamental to life. When nanothermometers began probing regions as small as a living cell, they triggered controversial claims of large intracellular temperature gradients. We review physical constraints energy‐conservation, entropy production, thermodynamic fluctuations, and molecular dynamics.
Taras Plakhotnik
wiley   +1 more source