The Experts below are selected from a list of 139809 Experts worldwide ranked by ideXlab platform
Peter Nordlander - One of the best experts on this subject based on the ideXlab platform.
-
pronounced linewidth narrowing of an aluminum nanoparticle Plasmon resonance by interaction with an aluminum metallic film
Nano Letters, 2015Co-Authors: Ali Sobhani, Alejandro Manjavacas, Peter Nordlander, Michael J Mcclain, Javier Garcia F De Abajo, Naomi J HalasAbstract:Aluminum nanocrystals and fabricated nanostructures are emerging as highly promising building blocks for Plasmonics in the visible region of the spectrum. Even at the individual nanocrystal level, however, the localized Plasmons supported by Al nanostructures possess a surprisingly broad spectral response. We have observed that when an Al nanocrystal is coupled to an underlying Al film, its dipolar Plasmon resonance linewidth narrows remarkably and shows an enhanced scattering efficiency. This behavior is observable in other Plasmonic metals, such as gold; however, it is far more dramatic in the aluminum nanoparticle–film system, reducing the dipolar Plasmon linewidth by more than half. A substrate-mediated hybridization of the dipolar and quadrupolar Plasmons of the nanoparticle reduces the radiative losses of the dipolar Plasmon. While this is a general effect that applies to all metallic nanoparticle–film systems, this finding specifically provides a new mechanism for narrowing Plasmon resonances in al...
-
pronounced linewidth narrowing of an aluminum nanoparticle Plasmon resonance by interaction with an aluminum metallic film
Nano Letters, 2015Co-Authors: Ali Sobhani, Alejandro Manjavacas, Peter Nordlander, Michael J Mcclain, Javier Garcia F De Abajo, Yang Cao, Naomi J HalasAbstract:Aluminum nanocrystals and fabricated nanostructures are emerging as highly promising building blocks for Plasmonics in the visible region of the spectrum. Even at the individual nanocrystal level, however, the localized Plasmons supported by Al nanostructures possess a surprisingly broad spectral response. We have observed that when an Al nanocrystal is coupled to an underlying Al film, its dipolar Plasmon resonance linewidth narrows remarkably and shows an enhanced scattering efficiency. This behavior is observable in other Plasmonic metals, such as gold; however, it is far more dramatic in the aluminum nanoparticle-film system, reducing the dipolar Plasmon linewidth by more than half. A substrate-mediated hybridization of the dipolar and quadrupolar Plasmons of the nanoparticle reduces the radiative losses of the dipolar Plasmon. While this is a general effect that applies to all metallic nanoparticle-film systems, this finding specifically provides a new mechanism for narrowing Plasmon resonances in aluminum-based systems, quite possibly expanding the potential of Al-based Plasmonics in real-world applications.
-
Pronounced Linewidth Narrowing of an Aluminum Nanoparticle Plasmon Resonance by Interaction with an Aluminum Metallic Film
2015Co-Authors: Ali Sobhani, Alejandro Manjavacas, Peter Nordlander, Javier Garcia F De Abajo, Yang Cao, Michael J. Mcclain, Naomi J HalasAbstract:Aluminum nanocrystals and fabricated nanostructures are emerging as highly promising building blocks for Plasmonics in the visible region of the spectrum. Even at the individual nanocrystal level, however, the localized Plasmons supported by Al nanostructures possess a surprisingly broad spectral response. We have observed that when an Al nanocrystal is coupled to an underlying Al film, its dipolar Plasmon resonance linewidth narrows remarkably and shows an enhanced scattering efficiency. This behavior is observable in other Plasmonic metals, such as gold; however, it is far more dramatic in the aluminum nanoparticle–film system, reducing the dipolar Plasmon linewidth by more than half. A substrate-mediated hybridization of the dipolar and quadrupolar Plasmons of the nanoparticle reduces the radiative losses of the dipolar Plasmon. While this is a general effect that applies to all metallic nanoparticle–film systems, this finding specifically provides a new mechanism for narrowing Plasmon resonances in aluminum-based systems, quite possibly expanding the potential of Al-based Plasmonics in real-world applications
-
Plexcitonic nanoparticles: Plasmon-exciton coupling in nanoshell-J-aggregate complexes.
Nano letters, 2008Co-Authors: Nche T. Fofang, Nikolay A Mirin, Peter Nordlander, Tae-ho Park, Oara Neumann, Naomi J HalasAbstract:Stable Au nanoshell-J-aggregate complexes are formed that exhibit coherent coupling between the localized Plasmons of a nanoshell and the excitons of molecular J-aggregates adsorbed on its surface. By tuning the nanoshell Plasmon energies across the exciton line of the J-aggregate, Plasmon-exciton coupling energies for these complexes are obtained. The strength of this interaction is dependent on the specific Plasmon mode of the nanoparticle coupled to the J-aggregate exciton. From a model based on Gans theory, we obtain an expression for the Plasmon-exciton hybridized states of the complex.
-
enhanced tunability and linewidth sharpening of Plasmon resonances in hybridized metallic ring disk nanocavities
Physical Review B, 2007Co-Authors: Peter Nordlander, M T Burnett, Stefan A MaierAbstract:Using the finite-difference time-domain method, we investigate the Plasmonic mode spectrum of a metallic nanostructure consisting of a concentric arrangement of a solid disk and a surrounding ring. We demonstrate that the energies of the Plasmon modes depend sensitively on the structural parameters of the disk and the ring. We show that the nature of the Plasmon modes can be understood simply as a hybridization of individual disk and ring Plasmons. This interaction results in a redshifted bonding Plasmon resonance of significantly narrower linewidth and larger electromagnetic field enhancements than the parent Plasmons. This highly tunable nanostructure has significant potential as a substrate for surface enhanced spectroscopies.
Min Seok Jang - One of the best experts on this subject based on the ideXlab platform.
-
real space imaging of acoustic Plasmons in large area graphene grown by chemical vapor deposition
Nature Communications, 2021Co-Authors: Sergey G Menabde, Inho Lee, Sanghyub Lee, Jacob T Heiden, Daehan Yoo, Teunteun Kim, Tony Low, Young Hee Lee, Min Seok JangAbstract:An acoustic Plasmon mode in a graphene-dielectric-metal structure has recently been spotlighted as a superior platform for strong light-matter interaction. It originates from the coupling of graphene Plasmon with its mirror image and exhibits the largest field confinement in the limit of a sub-nm-thick dielectric. Although recently detected in the far-field regime, optical near-fields of this mode are yet to be observed and characterized. Here, we demonstrate a direct optical probing of the Plasmonic fields reflected by the edges of graphene via near-field scattering microscope, revealing a relatively small propagation loss of the mid-infrared acoustic Plasmons in our devices that allows for their real-space mapping at ambient conditions even with unprotected, large-area graphene grown by chemical vapor deposition. We show an acoustic Plasmon mode that is twice as confined and has 1.4 times higher figure of merit in terms of the normalized propagation length compared to the graphene surface Plasmon under similar conditions. We also investigate the behavior of the acoustic graphene Plasmons in a periodic array of gold nanoribbons. Our results highlight the promise of acoustic Plasmons for graphene-based optoelectronics and sensing applications. Acoustic graphene Plasmons are superior to the graphene surface Plasmons in field confinement and normalized propagation length, thus promising for applications. Here, the authors report near-field imaging of acoustic Plasmons in high-quality CVD graphene, measure the AGP dispersion and propagation loss, and investigate their behavior in a periodic structure.
-
real space imaging of acoustic Plasmons in large area graphene grown by chemical vapor deposition
Nature Communications, 2021Co-Authors: Sergey G Menabde, Inho Lee, Sanghyub Lee, Jacob T Heiden, Daehan Yoo, Teunteun Kim, Tony Low, Young Hee Lee, Min Seok JangAbstract:An acoustic Plasmon mode in a graphene-dielectric-metal structure has recently been spotlighted as a superior platform for strong light-matter interaction. It originates from the coupling of graphene Plasmon with its mirror image and exhibits the largest field confinement in the limit of a sub-nm-thick dielectric. Although recently detected in the far-field regime, optical near-fields of this mode are yet to be observed and characterized. Here, we demonstrate a direct optical probing of the Plasmonic fields reflected by the edges of graphene via near-field scattering microscope, revealing a relatively small propagation loss of the mid-infrared acoustic Plasmons in our devices that allows for their real-space mapping at ambient conditions even with unprotected, large-area graphene grown by chemical vapor deposition. We show an acoustic Plasmon mode that is twice as confined and has 1.4 times higher figure of merit in terms of the normalized propagation length compared to the graphene surface Plasmon under similar conditions. We also investigate the behavior of the acoustic graphene Plasmons in a periodic array of gold nanoribbons. Our results highlight the promise of acoustic Plasmons for graphene-based optoelectronics and sensing applications.
-
hybrid surface phonon Plasmon polariton modes in graphene monolayer h bn heterostructures
Nano Letters, 2014Co-Authors: Victor W Brar, Min Seok Jang, Michelle C Sherrott, Seyoon Kim, J Lopez, Laura Kim, Mansoo Choi, Harry A AtwaterAbstract:Infrared transmission measurements reveal the hybridization of graphene Plasmons and the phonons in a monolayer hexagonal boron nitride (h-BN) sheet. Frequency-wavevector dispersion relations of the electromagnetically coupled graphene Plasmon/h-BN phonon modes are derived from measurement of nanoresonators with widths varying from 30 to 300 nm. It is shown that the graphene Plasmon mode is split into two distinct optical modes that display an anticrossing behavior near the energy of the h-BN optical phonon at 1370 cm^(–1). We explain this behavior as a classical electromagnetic strong-coupling with the highly confined near fields of the graphene Plasmons allowing for hybridization with the phonons of the atomically thin h-BN layer to create two clearly separated new surface-phonon-Plasmon-polariton (SPPP) modes.
Inho Lee - One of the best experts on this subject based on the ideXlab platform.
-
real space imaging of acoustic Plasmons in large area graphene grown by chemical vapor deposition
Nature Communications, 2021Co-Authors: Sergey G Menabde, Inho Lee, Sanghyub Lee, Jacob T Heiden, Daehan Yoo, Teunteun Kim, Tony Low, Young Hee Lee, Min Seok JangAbstract:An acoustic Plasmon mode in a graphene-dielectric-metal structure has recently been spotlighted as a superior platform for strong light-matter interaction. It originates from the coupling of graphene Plasmon with its mirror image and exhibits the largest field confinement in the limit of a sub-nm-thick dielectric. Although recently detected in the far-field regime, optical near-fields of this mode are yet to be observed and characterized. Here, we demonstrate a direct optical probing of the Plasmonic fields reflected by the edges of graphene via near-field scattering microscope, revealing a relatively small propagation loss of the mid-infrared acoustic Plasmons in our devices that allows for their real-space mapping at ambient conditions even with unprotected, large-area graphene grown by chemical vapor deposition. We show an acoustic Plasmon mode that is twice as confined and has 1.4 times higher figure of merit in terms of the normalized propagation length compared to the graphene surface Plasmon under similar conditions. We also investigate the behavior of the acoustic graphene Plasmons in a periodic array of gold nanoribbons. Our results highlight the promise of acoustic Plasmons for graphene-based optoelectronics and sensing applications. Acoustic graphene Plasmons are superior to the graphene surface Plasmons in field confinement and normalized propagation length, thus promising for applications. Here, the authors report near-field imaging of acoustic Plasmons in high-quality CVD graphene, measure the AGP dispersion and propagation loss, and investigate their behavior in a periodic structure.
-
real space imaging of acoustic Plasmons in large area graphene grown by chemical vapor deposition
Nature Communications, 2021Co-Authors: Sergey G Menabde, Inho Lee, Sanghyub Lee, Jacob T Heiden, Daehan Yoo, Teunteun Kim, Tony Low, Young Hee Lee, Min Seok JangAbstract:An acoustic Plasmon mode in a graphene-dielectric-metal structure has recently been spotlighted as a superior platform for strong light-matter interaction. It originates from the coupling of graphene Plasmon with its mirror image and exhibits the largest field confinement in the limit of a sub-nm-thick dielectric. Although recently detected in the far-field regime, optical near-fields of this mode are yet to be observed and characterized. Here, we demonstrate a direct optical probing of the Plasmonic fields reflected by the edges of graphene via near-field scattering microscope, revealing a relatively small propagation loss of the mid-infrared acoustic Plasmons in our devices that allows for their real-space mapping at ambient conditions even with unprotected, large-area graphene grown by chemical vapor deposition. We show an acoustic Plasmon mode that is twice as confined and has 1.4 times higher figure of merit in terms of the normalized propagation length compared to the graphene surface Plasmon under similar conditions. We also investigate the behavior of the acoustic graphene Plasmons in a periodic array of gold nanoribbons. Our results highlight the promise of acoustic Plasmons for graphene-based optoelectronics and sensing applications.
-
Real-space imaging of acoustic Plasmons in large-area graphene grown by chemical vapor deposition
'Springer Science and Business Media LLC', 2021Co-Authors: Menabde, Sergey G., Inho Lee, Sanghyub Lee, Teunteun Kim, Young Hee Lee, Ha Heonhak, Heiden, Jacob T., Yoo Daehan, Low Tony, Oh Sang-hyunAbstract:An acoustic Plasmon mode in a graphene-dielectric-metal structure has recently been spotlighted as a superior platform for strong light-matter interaction. It originates from the coupling of graphene Plasmon with its mirror image and exhibits the largest field confinement in the limit of a sub-nm-thick dielectric. Although recently detected in the far-field regime, optical near-fields of this mode are yet to be observed and characterized. Here, we demonstrate a direct optical probing of the Plasmonic fields reflected by the edges of graphene via near-field scattering microscope, revealing a relatively small propagation loss of the mid-infrared acoustic Plasmons in our devices that allows for their real-space mapping at ambient conditions even with unprotected, large-area graphene grown by chemical vapor deposition. We show an acoustic Plasmon mode that is twice as confined and has 1.4 times higher figure of merit in terms of the normalized propagation length compared to the graphene surface Plasmon under similar conditions. We also investigate the behavior of the acoustic graphene Plasmons in a periodic array of gold nanoribbons. Our results highlight the promise of acoustic Plasmons for graphene-based optoelectronics and sensing applications. Acoustic graphene Plasmons are superior to the graphene surface Plasmons in field confinement and normalized propagation length, thus promising for applications. Here, the authors report near-field imaging of acoustic Plasmons in high-quality CVD graphene, measure the AGP dispersion and propagation loss, and investigate their behavior in a periodic structure.11Nsciescopu
Marco Polini - One of the best experts on this subject based on the ideXlab platform.
-
highly confined low loss Plasmons in graphene boron nitride heterostructures
Nature Materials, 2015Co-Authors: Achim Woessner, Matteo Carrega, Alessandro Principi, Giovanni Vignale, Mark B Lundeberg, Yuanda Gao, Takashi Taniguchi, Kenji Watanabe, Pablo Alonsogonzalez, Marco PoliniAbstract:Graphene Plasmons were predicted to possess simultaneous ultrastrong field confinement and very low damping, enabling new classes of devices for deep-subwavelength metamaterials, single-photon nonlinearities, extraordinarily strong light–matter interactions and nano-optoelectronic switches. Although all of these great prospects require low damping, thus far strong Plasmon damping has been observed, with both impurity scattering and many-body effects in graphene proposed as possible explanations. With the advent of van der Waals heterostructures, new methods have been developed to integrate graphene with other atomically flat materials. In this Article we exploit near-field microscopy to image propagating Plasmons in high-quality graphene encapsulated between two films of hexagonal boron nitride (h-BN). We determine the dispersion and Plasmon damping in real space. We find unprecedentedly low Plasmon damping combined with strong field confinement and confirm the high uniformity of this Plasmonic medium. The main damping channels are attributed to intrinsic thermal phonons in the graphene and dielectric losses in the h-BN. The observation and in-depth understanding of low Plasmon damping is the key to the development of graphene nanophotonic and nano-optoelectronic devices.
-
Highly confined low-loss Plasmons in graphene-boron nitride heterostructures
Nature Materials, 2015Co-Authors: Achim Woessner, Matteo Carrega, Pablo Alonso González, Alessandro Principi, Giovanni Vignale, Mark B Lundeberg, Yuanda Gao, Takashi Taniguchi, Kenji Watanabe, Marco PoliniAbstract:Graphene Plasmons were predicted to possess ultra-strong field confinement and very low damping at the same time, enabling new classes of devices for deep subwavelength metamaterials, single-photon nonlinearities, extraordinarily strong light-matter interactions and nano-optoelectronic switches. While all of these great prospects require low damping, thus far strong Plasmon damping was observed, with both impurity scattering and many-body effects in graphene proposed as possible explanations. With the advent of van der Waals heterostructures, new methods have been developed to integrate graphene with other atomically flat materials. In this letter we exploit near-field microscopy to image propagating Plasmons in high quality graphene encapsulated between two films of hexagonal boron nitride (h-BN). We determine dispersion and particularly Plasmon damping in real space. We find unprecedented low Plasmon damping combined with strong field confinement, and identify the main damping channels as intrinsic thermal phonons in the graphene and dielectric losses in the h-BN. The observation and in-depth understanding of low Plasmon damping is the key for the development of graphene nano-photonic and nano-optoelectronic devices.
Mark I. Stockman - One of the best experts on this subject based on the ideXlab platform.
-
generation of traveling surface Plasmon waves by free electron impact
Nano Letters, 2006Co-Authors: M V Bashevoy, Fredrik Jonsson, Alexey V Krasavin, N I Zheludev, Yifang Chen, Mark I. StockmanAbstract:The injection of a beam of free 50 keV electrons into an unstructured gold surface creates a highly localized source of traveling surface Plasmons with spectra centered below the surface Plasmon resonance frequency. The Plasmons were detected by a controlled decoupling into light with a grating at a distance from the excitation point. The dominant contribution to the Plasmon generation appears to come from the recombination of d-band holes created by the electron beam excitation.
-
Plasmon hybridization in nanoparticle dimers
Nano Letters, 2004Co-Authors: Peter Nordlander, Chris Oubre, Emil Prodan, Mark I. StockmanAbstract:We apply the recently developed Plasmon hybridization method to nanoparticle dimers, providing a simple and intuitive description of how the energy and excitation cross sections of dimer Plasmons depend on nanoparticle separation. We show that the dimer Plasmons can be viewed as bonding and antibonding combinations, i.e., hybridization of the individual nanoparticle Plasmons. The calculated Plasmon energies are compared with results from FDTD simulations.
