نتایج جستجو برای: plasmonic

تعداد نتایج: 12630  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Chongyue Yi Pratiksha D Dongare Man-Nung Su Wenxiao Wang Debadi Chakraborty Fangfang Wen Wei-Shun Chang John E Sader Peter Nordlander Naomi J Halas Stephan Link

Plasmon hybridization theory, inspired by molecular orbital theory, has been extremely successful in describing the near-field coupling in clusters of plasmonic nanoparticles, also known as plasmonic molecules. However, the vibrational modes of plasmonic molecules have been virtually unexplored. By designing precisely configured plasmonic molecules of varying complexity and probing them at the ...

Journal: :Advanced materials 2012
Guowei Xu Jianwei Liu Qian Wang Rongqing Hui Zhijun Chen Victor A Maroni Judy Wu

Plasmonic graphene is fabricated using thermally assisted self-assembly of silver nanoparticles on graphene. The localized surface-plasmonic effect is demonstrated with the resonance frequency shifting from 446 to 495 nm when the lateral dimension of the Ag nanoparticles increases from about 50 to 150 nm. Finite-difference time-domain simulations are employed to confirm the experimentally obser...

Journal: :Nano letters 2014
Wei-Yi Tsai Jer-Shing Huang Chen-Bin Huang

We demonstrate selective trapping or rotation of optically isotropic dielectric microparticles by plasmonic near field in a single gold plasmonic Archimedes spiral. Depending on the handedness of circularly polarized excitation, plasmonic near fields can be selectively engineered into either a focusing spot for particle trapping or a plasmonic vortex for particle rotation. Our design provides a...

Journal: :Nanoscale 2014
Alexander S Urban Sol Carretero-Palacios Andrey A Lutich Theobald Lohmüller Jochen Feldmann Frank Jäckel

This feature article discusses the optical trapping and manipulation of plasmonic nanoparticles, an area of current interest with potential applications in nanofabrication, sensing, analytics, biology and medicine. We give an overview over the basic theoretical concepts relating to optical forces, plasmon resonances and plasmonic heating. We discuss fundamental studies of plasmonic particles in...

2017
José A. Rodrigo

Plasmonic nanoparticles are able to control light at nanometre-scale by coupling electromagnetic fields to the oscillations of free electrons in metals. Deposition of such nanoparticles onto substrates with tailored patterns is essential, for example, in fabricating plasmonic structures for enhanced sensing. This work presents an innovative micro-patterning technique, based on optoelectic print...

Journal: :Physical review letters 2014
Itai Epstein Ady Arie

We demonstrate the generation of self-accelerating surface plasmon beams along arbitrary caustic curvatures. These plasmonic beams are excited by free-space beams through a two-dimensional binary plasmonic phase mask, which provides the missing momentum between the two beams in the direction of propagation and sets the required phase for the plasmonic beam in the transverse direction. We examin...

Journal: :Nature communications 2013
C W Berry N Wang M R Hashemi M Unlu M Jarrahi

Even though the terahertz spectrum is well suited for chemical identification, material characterization, biological sensing and medical imaging, practical development of these applications has been hindered by attributes of existing terahertz optoelectronics. Here we demonstrate that the use of plasmonic contact electrodes can significantly mitigate the low-quantum efficiency performance of ph...

2012
Sri Nengsih Akrajas Ali Umar Muhamad Mat Salleh Munetaka Oyama

The effect of morphology on the plasmonic sensing of the presence of formaldehyde in water by gold nanostructures has been investigated. The gold nanostructures with two different morphologies, namely spherical and rod, were prepared using a seed-mediated method. In typical results, it was found that the plasmonic properties of gold nanostructures were very sensitive to the presence of formalde...

Journal: :The Review of scientific instruments 2010
Takumi Sannomiya Tobias E Balmer Christian Hafner Manfred Heuberger Janos Vörös

The combination of interferometry and plasmonic structure, which consists of gold nanoparticle layer, sputter coated silicon oxide spacer layer, and aluminum mirror layer, was studied in transmission mode for biosensing and refractive index sensing applications. Because of the interferometric nature of the system, the information of the reflection amplitude and phase of the plasmonic layer can ...

Journal: :Nanoscale 2013
Jibin Song Zheng Fang Chenxu Wang Jiajing Zhou Bo Duan Lu Pu Hongwei Duan

We have developed a new type of photo-responsive plasmonic vesicles that allow for active delivery of anticancer payloads to specific cancer cells and personalized drug release regulated by external photo-irradiation. Our results show that amphiphilic gold nanoparticles carrying hydrophilic poly(ethylene glycol) (PEG) and photo-responsive hydrophobic poly(2-nitrobenzyl acrylate) (PNBA) can asse...

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