We present a systematic theoretical investigation of third-order nonlinear optical effects enhancement in spherical gold nanoparticles within the quasi-static approximation. The dielectric response of gold is described using a Drude model. Local field enhancement and nonlinear amplification scaling as () 4 L E are calculated for nanoparticle radii R=10−60 нм embedded inair (εm=1.0) and glass (εm=2.25). For particles with R=30 нм, the local field enhancementreaches max L ≈6.5 in air and ≈11 in glass, corresponding to nonlinear enhancement factors4 L ≈1.9×103and 1.5×104, respectively. Increasing particle size reduces surface-scatteringlosses and increases the nonlinear response, with a maximum enhancement ∼3.0×104obtainedfor particles R=60 нм in glass. The results quantitatively demonstrate the combined influenceof nanoparticle size and dielectric environment on plasmon-enhanced nonlinear response within the validity range of the quasi-static approximation. The predicted effective third-orders usceptibility reaches (3) 15 2 2 10 m /V , eff− χ ∼ representing approximately four orders of magnitudeenhancement compared to bulk gold.
| Mualliflar | Eraliyeva, Y.M., Sapaev, U.K. |
|---|---|
| Jurnal | O‘zbekiston fizika jurnali |
| Nashr sanasi | 2026-08-04 |
| Jild | 28 |
| Son | 2 |
| Til | Ingliz |
| DOI | 10.52304/.v28i2.646 |
DOI: 10.52304/.v28i2.646 · Maqolaning asl sahifasi
поверхностный плазмонный резонанс, наночастицы золота, нелинейность 3-его порядка, усиление локального поля, модель Друде, квазистатическое приближение, затухание, surface plasmon resonance, gold nanoparticles, third-order nonlinear-ity, local field enhancement, Drude model, quasi-static approximation, size-dependent damping
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