Optimization of second harmonic generation in Au/Si core-shell nanoparticles

Jafari, Neamat A.; Bahari, Ali

doi:10.1016/j.photonics.2021.100972

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…In order to adopt the results with experimental works, the optical properties of Au and Si have been taken from [28]. The validity of the numerical simulation is shown in the previous work [29] by comparing it with [30]. The radiation beam is a plane wave that propagates the negative zdirection and is polarized in the y-direction.…”

Section: The Results Of Numerical Calculationsmentioning

confidence: 99%

Enhancement of second harmonic generation from three layers hybrid dielectric/metal/dielectric nanospheres

Bahari¹,

Jafari²

2023

Phys. Scr.

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Due to the significant linear and nonlinear (NL) optical properties, hybridization of high-index dielectric and plasmonic materials can result in generating NL optical phenomena with high efficiency compared to the individual nanostructures made of these materials. The efficient surface second harmonic generation (SSHG) from three layers Si/Au/Si (SAS) nanospheres are investigated by the finite element method. The resonance wavelengths are determined by the numerical calculation of the linear spectral response. Then, by calculating the SSHG from each interface of the SAS at resonance wavelengths, it is shown that the core surface (the middle interface) has the dominant contribution at shorter (longer) wavelengths to enhance the SSHG. Finally, the total SSHG is compared to individual silicon nanosphere (SNS), which shows enhancing the efficiency of SHG up to 50 times at some resonance wavelength. The results of this work can pave the way for investigating and enhancing the efficiency of nano-photonic devices such as nano-lasers and nano-sensors.

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Section: The Results Of Numerical Calculationsmentioning

confidence: 99%

Enhancement of second harmonic generation from three layers hybrid dielectric/metal/dielectric nanospheres

Bahari¹,

Jafari²

2023

Phys. Scr.

Self Cite

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“…

, γ , δ′ , are 1 × 10 −19 m 2 /V. We performed the numerical simulations of the SHG with COMSOL Multiphysics, following the methods described in references [ 31 , 42 , 43 ]. Our numerical simulation method supports the simulation results in [ 33 , 44 ] well.…”

Section: Resultsmentioning

confidence: 99%

Dual-Wavelength Forward-Enhanced Directional Scattering and Second Harmonic Enhancement in Open-Hole Silicon Nanoblock

et al. 2022

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Nanostructures with appropriate sizes can limit light-matter interaction and support electromagnetic multipole resonance. The interaction between light and nanostructures is intimately related to manipulating the direction of scattered light in the far field as well as the electromagnetic field in the near field. In this paper, we demonstrate dual-wavelength directional forward-scattering enhancement in an individual open-hole silicon nanoblock (OH-SiNB) and simultaneously achieve bulk and surface electromagnetic field localization. The second harmonic generation is enhanced using electromagnetic field localization on the square hole surface. Numerical simulations reveal that the resonance modes, at λ1 = 800 nm and λ2 = 1190 nm, approximately satisfy the Kerker condition. In the near field, the magnetic dipole modes at dual wavelength all satisfy the boundary condition that the normal component of the electric displacement is continuous on the square holes surface, thus obtaining the surface electromagnetic field localization. Moreover, highly efficient second harmonic generation can be achieved at dual wavelengths using the surface electromagnetic field localization and the increased surface area of the square holes. Our results provide a new strategy for the integration of nanoantennas and nonlinear optoelectronic devices in optical chips.

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“…Moreover, dielectric materials with their unique optical properties, including lower ohmic losses, very strong nonlinearity, and high refractive index, can enhance electromagnetic fields within their volume through electric and magnetic multipoles. So, the hybrid metal-dielectric nanostructures exhibit special characteristics such as high efficiency, unique electrical behavior, and the ability to control and tune their properties [2,3].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of high-order harmonic generation by gold nanorod arrays in hybrid nanostructures: effect of number of gold nanorod

Peymani,

Bahari

2024

Phys. Scr.

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Hybrid metal-dielectric nanostructures are highly effective and helpful in generating and enhancing linear and nonlinear optical phenomena due to their unique optical properties. In this study, the linear optical responses, and second- and third-order harmonics have been calculated numerically for this structure. Nonlinear optical response efficiency has been studied at the resonance wavelengths of the nanostructure by varying its parameters (radius and length). The desired efficiency can be achieved by adjusting the radius and length of the nanorods and matching the resonance wavelengths with the fundamental and generation frequencies of nonlinear optical phenomena in specific applications. Moreover, the effect of the number of gold nanorods on harmonic generation has been investigated. By increasing the number of nanorods in pairs, it is possible to generate high-order harmonics. The acquired results can be used to improve optical devices such as biomedical equipment, optical integrated circuits, and sensors.

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Optimization of second harmonic generation in Au/Si core-shell nanoparticles

Cited by 3 publications

References 27 publications

Enhancement of second harmonic generation from three layers hybrid dielectric/metal/dielectric nanospheres

Enhancement of second harmonic generation from three layers hybrid dielectric/metal/dielectric nanospheres

Dual-Wavelength Forward-Enhanced Directional Scattering and Second Harmonic Enhancement in Open-Hole Silicon Nanoblock

Numerical investigation of high-order harmonic generation by gold nanorod arrays in hybrid nanostructures: effect of number of gold nanorod

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