Influence of Anisotropy on Optical Bistability in Plasmonic Nanoparticles with Cylindrical Symmetry

Daneshfar, Nader; Naseri, Tayebeh; Foroughi, Hamidreza

doi:10.1007/s11468-017-0522-4

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…One of the most rapidly developing areas of condensed matter physics and nanotechnology at present is the control of light at the nanoscale. 1 Devices of nonlinear optics are one of the various types of nanosized particles, and induced optical bistability (IOB) is one of them. IOB is particularly fascinating since it can be applied to optical computers, quantum information, optical detectors, optical transistors, and other applications.…”

Section: Introductionmentioning

confidence: 99%

Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores

Hirpha,

Bergaga,

Ali

et al. 2024

AIP Advances

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We investigated how induced optical bistability (IOB) and bistability domain (BD) of spheroidal core–shell nanocomposites (NCs) are affected by the depolarization factor (L), metal fraction (p), and host matrix (ɛh). The NCs are composed of passive and active dielectric cores coated with a metallic shell and embedded in various host matrices. By employing Laplace’s equation and the Drude–Lorentz model, we calculated the electric field enhancement in various regions of the NCs and studied their IOB theoretically and numerically. The BD of the same NCs is investigated using the root analysis approach. The study reveals that when the value of L decreases, the bistable region of OB increases. However, when p increases at constant L and ɛh, the bistable region gets wider. When the value of ɛh increases, the IOB region is achieved at larger values of incident field. Moreover, the IOB produced was narrower in the passive dielectric core than in the active one, showing that the type of core material also influences the IOB of the core–shell NCs. When the value of L changes, the region of BD also changes in both types of cores. Similarly, changing the value of p in both types of cores causes the BD to vanish or emerge. Moreover, varying ɛh, BD is produced in the OB regions. Overall, the IOB and BD in each core are sensitive to changes in L, p, and ɛh. Varying these parameters leads to the possibility of tuning the bistable regions, which can be used in optical circuits, logic operations, and optical memory.

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Section: Introductionmentioning

confidence: 99%

Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores

Hirpha,

Bergaga,

Ali

et al. 2024

AIP Advances

View full text Add to dashboard Cite

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“…Xia had well synthesized concentric nanpshells with a diameter of 50nm consting of a gold core, a tunable silicon dielectric-layer and outer gold nanoshell [14]. Daneshfar et al have studied the effect of various plasmonic materials on the scattering-to-absorption ratio, the results show that the plasmon resonance can be tuned and plays a key role in plasmonic solar cell efficiency improvement with quasi-static theory [15,16].Moradian et al have found that small size three-layered core-shell nanosphere exhibits strong SERS enhancement factor by using quasi-static theory [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Geometrical Parameters on Local Electric Field Enhancement of Bimetallic Three-Layered Nanotubes by Using Quasi-static Theory

et al. 2023

Plasmonics

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Due to the plasmon hybridization between nanowire and outer nanotube, the geometrical parameters of nanotube take great effect on absorption cross section and local electric field enhancement. In this paper, we study the effects of the inner nanowire radius, shell thickness, middle dielectric functions and surrounding medium functions on absorption cross section and local electric field enhancement of bimetallic three-layered nanotubes, gold-dielectric-silver (GDS) nanotube and silver-dielectric-gold (SDG) nanotube in detail based on quasi-static theory. The results show that the thickness of outer nanotube plays a more role to tune local surface plasmon resonance (LSPR) than that of inner nanowire, whereas a better LSPR could be obtained with a higher surrounding dielectric function. In addition, the local electric field enhancement is also investigated.The maximum local electric field enhancement could be obtained with smaller thickness of dielectric layer and higher surrounding dielectric function. Our study provides a way to analyze optical properties of GDS and SDG nanotube and also broaden their applications in sensor and optical data storage.

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Terahertz optical bistability of graphene-coated cylindrical core–shell nanoparticles

et al. 2018

Self Cite

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In this study, we investigate the optical bistability of graphene-coated nanoparticles with cylindrical core-shell structure at terahertz frequency, because graphene displays optical bistability and multistability in a broad range of incident optical intensity. The choice of core-shell system is due to its larger local electric field enhancement, where this characteristic is important for the optical bistable systems. This optical bistability strongly depends on the geometry of the nanoparticle, the fractional volume of the metallic core as well as Fermi energy of graphene. The surrounding medium could also finely affect the optical bistability and induce switching from optical bistability to optical tristability. Since the prosperity of optoelectronics properties of graphene and the importance of core-shell nanoparticles have attracted enormous interest, this model may find potential applications in optical bistable devices such as all-optical switches and biosensors at terahertz communication in near future.

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Influence of Anisotropy on Optical Bistability in Plasmonic Nanoparticles with Cylindrical Symmetry

Cited by 10 publications

References 22 publications

Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores

Investigation of optical bistability in spheroidal core–shell nanocomposites with passive and active dielectric cores

Effect of Geometrical Parameters on Local Electric Field Enhancement of Bimetallic Three-Layered Nanotubes by Using Quasi-static Theory

Terahertz optical bistability of graphene-coated cylindrical core–shell nanoparticles

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