Surface Plasmon Studies of Thin Silver/Gold Bimetallic Films

The importance of plasmonic nanoparticles in sensor development, imaging, photodiagnostics, and optoelectronics has resulted in a strong interest toward the development of straightforward synthetic methods for their preparation. In this article, we review some of the most significant advances that have been made in the synthesis of plasmonic bimetallic nanoparticles. Approaches to control morphology, with an emphasis on reactions that produce uniform particles with well-defined sizes and shapes and in high yields, are described. In addition, several characterization techniques that have been employed to elucidate the morphology of the particles are illustrated.

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“…Some of these effects have been noted for catalytic [18,19] and sensor applications [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 97%

Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

2009

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“…In the last few years, the bimetallic combination of silver and gold has drawn a lot of attention in surface plasmon resonance (SPR) applications for conventional [1] and nanoparticle case [2,3]. Such a bimetallic combination is quite able to combine the properties of both metals.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Performance Parameters of Conventional and Nano-plasmonic Fiber Optic Sensors

Sharma

Gupta

2007

Plasmonics

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A detailed comparative analysis is carried out between two fiber optic surface plasmon resonance (SPR) sensor probes with different bimetallic configurations. One consists of a step arrangement of thin layers of silver and gold. Another one consists of alloy layer formed of spherical silver and gold nanoparticles. Their sensitivity and detection accuracy are compared. Better configuration is predicted with proper logics and rationales.

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“…In turn, this tunability could be used to improve the performance of devices for a variety of applications, such as perfect absorbers, photovoltaics, hydrogen storage, metallurgy, catalysis, and electrocatalysis . However, in contrast to the well‐investigated dispersion relation of pure noble metals (Ag and Au), the dispersion of SPPs for Ag–Au alloys has rarely been explored . Additionally, the correlations between the effect of alloying on the optical dispersion relation, the threshold of the interband transition, and the new material's band structure are still not well understood.…”

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confidence: 99%

Band Structure Engineering by Alloying for Photonics

Gong

Kaplan

Benson

et al. 2018

Advanced Optical Materials

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at deep sub-wavelengths, [2] leading to a variety of applications including nanolasers, [3] sensors, [4] bioimaging, [5] surfaceenhanced Raman spectroscopy, [6,7] color displays, [8] and others. [9][10][11][12] To improve the performance of today's photonic systems, researchers have extensively investigated the fundamental relation between the wave vector and energy of an SPP wave-named dispersion relation. This quantity describes the propagation of light within a material (i.e., medium), extremely relevant for the abovementioned optical devices. Therefore, understanding the dispersion relation can allow the design of optical materials with superior response, ranging from 2D van der Waals to oxides and metals. Concerning 2D materials, it can uncover the origin of tunable polaritons in hyperbolic metamaterials based on graphene and hexagonal boron nitride (h-BN), which is due to the hybridization of SPP and surface phonon polaritons. [13] As another example, by utilizing the band-edge mode of the dispersion relation in metallic nanocavities, [3] lasing with a 200 times enhancement of the spontaneous emission rate of the dye has been reached. [14] As a class of emerging photonic materials, noble metal alloys with permittivity and localized surface plasmon resonances not achievable by pure metals [9,15,16] have been proposed as alternative candidates for plasmonics [12,[17][18][19][20] because of their tunable dielectric functions, which make it possible to engineer the alloy composition to attain optical properties that will meet desired resonances. In turn, this tunability could be used to Surface plasmon polaritons (SPPs) enable the deep subwavelength confinement of an electromagnetic field, which can be used in optical devices ranging from sensors to nanoscale lasers. However, the limited number of metals that satisfy the required boundary conditions for SPP propagation in a metal/dielectric interface severely limits its occurrence in the visible range of the electromagnetic spectrum. We introduce the strategy of engineering the band structure of metallic materials by alloying. We experimentally and theoretically establish the control of the dispersion relation in Ag-Au alloys by varying the film chemical composition. Through X-ray photoelectron spectroscopy (XPS) measurements and partial density-of-states calculations we deconvolute the d band contribution of the density-of-states from the valence band spectrum, showing that the shift in energy of the d band follows the surface plasmon resonance change of the alloy. Our density functional theory calculations of the alloys band structure predict the same variation of the threshold of the interband transition, which is in very good agreement with our optical and XPS experiments. By elucidating the correlation between the optical behavior and band structure of alloys, we anticipate the fine control of the optical properties of metallic materials beyond pure metals. Band Structure EngineeringThe ORCID identification number(s) for the author(s) of this article can b...

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Surface Plasmon Studies of Thin Silver/Gold Bimetallic Films

Cited by 48 publications

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Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

Recent Advances in the Synthesis of Plasmonic Bimetallic Nanoparticles

Comparison of Performance Parameters of Conventional and Nano-plasmonic Fiber Optic Sensors

Band Structure Engineering by Alloying for Photonics

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