Plasmonics Effects of Nanometal Embedded in a Dielectric Substrate

Abstract

We numerically report on first realization of nearfield interaction and localized surface Plasmon resonance of a pair of silver-shell nanospheres with different dielectric holes embedded in a dielectric substrate using finite element method. An electromagnetic mode different from the solid case of the same volume is excited inside and outside the shell surface, resulting in an intensity enhancement in a gap of particle pair surrounding the particlesubstrate interface. We find that the embedded depth of the nanoparticles pair in a substrate will influence the position of the localized fields which is confined in the gap. Besides, the near-field intensity becomes less intense and the spectrum of peak resonances red-shifted as the index difference of interface and embedded depth decreases. The proposed models have been prepared to cover the ultraviolet-visible, visible, and near-infrared (NIR) regions with application to sensors and spectroscopy purposes by varying the embedded depth and pertinent to the functionality of sensors, spectroscopy, and other optical devices.

Substrate-Mediated Broadband Tunability in Plasmonic Resonances of Metal Nanoantennas on Finite High-Permittivity Dielectric Substrate

“…Cubic, or in general rectangular cuboid, nanoparticles are usually preferable for such applications owing to their broad resonance tunability, comparatively large optical coefficients, and relative ease of fabrication [18]. In most plasmonic devices and applications, these nanoantennas are positioned on a planar dielectric substrate [19][20][21][22][23][24]. Hence, a thorough investigation of their optical properties revealing the schemes for broad resonance tunability of such finite substrate-supported nanoantennas are of particular theoretical and experimental interest.…”

Dielectric function of two-phase colloid–polymer nanocomposite

“…10,11 These localized surface plasmons (LSPs) have been subject to extended theoretical modelling [10][11][12][13][14][15] and experimental investigations. 10,11,[16][17][18][19][20][21][22] Studies have e.g.…”

“…As in this case the plasmon excitation extends outside the film, the dielectric surrounding effectively consists of two phases: the polymer matrix and the outside environment. For a correct prediction of the plasmon behavior in these materials, elaborated numerical simulations are commonly used even for simple particle geometries 14,15,31,32 However, in many situations, a fast procedure to approximate the plasmon resonance of these films would be of great advantage. This perspectives article presents an LbL fabrication technique for preparing nanocomposite films and discusses the optical properties of these films.…”

Plasmonic tunable filter based on trapezoid resonator waveguide

“…For instance, single fixed and periodic structures have been proposed for MIM filters, such as the tooth-shaped resonator [11,12] and the rectangular resonator [13][14][15][16]. Chau et al have proposed an effective way to modulate the transmission-peak wavelength via changing the parameters of resonator [17,18]. Liu et al have researched a graphene-based Fabry-Perot (F-P) microcavity for plasmon-induced transparency effect working as a band-pass filter [19].…”