Analytical model of surface second-harmonic generation

Javůrek, Dalibor; Peřina, Jan

doi:10.1038/s41598-019-39260-9

Cited by 10 publications

(3 citation statements)

References 22 publications

(42 reference statements)

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“…In this limitation, we suppose that the energy conversion to the second harmonic is very low such that the fundamental wave remains essentially undepleted. This process is known as a non-depletion approximation in a second harmonic generation [30]. To show that our approximation method gives a qualitatively correct result in the last section, we use the finite-element method to demonstrate asymmetric photon localization in a system with similar composition.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Localization by Second Harmonic Generation

Ghaemi-Dizicheh¹,

Targholizadeh²,

Feng³

et al. 2021

Preprint

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We introduce a nonlinear photonic system that enables asymmetric localization and unidirectional transfer of an electromagnetic wave through the second harmonic generation process. Our proposed scattering setup consists of a non-centrosymmetric nonlinear slab with nonlinear susceptibility χ (2) placed to the left of a one-dimensional periodic linear photonic crystal with an embedded defect. We engineered the linear lattice to allow the localization of a selected frequency 2ω while frequency ω is in the gap. Thus in our proposed scattering setup, a left-incident coherent transverse electric wave with frequency ω partially converts to frequency 2ω and becomes localized at the defect layer while the unconverted remaining field with frequency ω exponentially decays throughout the lattice and gets reflected. For a right-incident wave with frequency ω there won't be any frequency conversion and the incident wave gets fully reflected. Our proposed structure will find application in designing new optical components such as optical sensors, switches, transistors, and logic elements.

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Section: Introductionmentioning

confidence: 99%

Asymmetric Localization by Second Harmonic Generation

Ghaemi-Dizicheh¹,

Targholizadeh²,

Feng³

et al. 2021

Preprint

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“…The origin of SSHG can be found in Bloembergen and coworker works [19]. After that, other works are done to study aspects of this phenomenon, such as determining the elements of surface second-order susceptibility tensor [20,21].…”

Section: Introductionmentioning

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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“…Recent studies on surface SHG in semiconductors considered regions on the order of a few nanometers at the material/air interface and demonstrated that this effective volume is a good representation of surface SHG. 28,29,34 Therefore, in our modeling, we consider two regions at the air/GaAs and GaAs/AlGaO interfaces with a thickness of 10 nm each and with a symmetry tensor of pointgroup symmetry mm2. When we include both surface and bulk nonlinearities, with the following surface-induced nonlinear coefficients: χ zxx (2,s) = χ zyy (2,s) = 6χ xzy (2) , χ zzz (2,s) = 6χ xzy (2) , χ yxz (2,s) = χ xzy (2,s) = 1.8χ xzy (2) , while maintaining the surface-induced nonlinear tensor symmetry (see Note S1), we successfully retrieve the twofold symmetry in the total SHG intensity (Figure 3a,c, bottom panels).…”

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confidence: 99%

Cascaded Optical Nonlinearities in Dielectric Metasurfaces

et al. 2022

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Since the discovery of the laser, optical nonlinearities have been at the core of efficient light conversion sources. Typically, thick transparent crystals or quasi-phase matched waveguides are utilized in conjunction with phase-matching techniques to select a single parametric process. In recent years, due to the rapid developments in artificially structured materials, optical frequency mixing has been achieved at the nanoscale in subwavelength resonators arrayed as metasurfaces. Phase matching becomes relaxed for these wavelength-scale structures, and all allowed nonlinear processes can, in principle, occur on an equal footing. This could promote harmonic generation via a cascaded (consisting of several frequency mixing steps) process. However, so far, all reported work on dielectric metasurfaces have assumed frequency mixing from a direct (single step) nonlinear process. In this work, we prove the existence of cascaded second-order optical nonlinearities by analyzing the second- and third-wave mixing from a highly nonlinear metasurface in conjunction with polarization selection rules and crystal symmetries. We find that the third-wave mixing signal from a cascaded process can be of comparable strength to that from conventional third-harmonic generation and that surface nonlinearities are the dominant mechanism that contributes to cascaded second-order nonlinearities in our metasurface.

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Analytical model of surface second-harmonic generation

Cited by 10 publications

References 22 publications

Asymmetric Localization by Second Harmonic Generation

Asymmetric Localization by Second Harmonic Generation

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

Cascaded Optical Nonlinearities in Dielectric Metasurfaces

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