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<p>We present a detailed theoretical and numerical study on the temperature-tunable plasmonic and optical behavior of CdS@ITO core-shell quantum dots (CSQDs) embedded in dielectric environments. Utilizing the quasi-static approximation and a thermally adaptive Maxwell-Garnett effective medium approach, we systematically analyze how thermal variation modulates key performance metrics, including localized surface plasmon resonance (LSPR), local field enhancement factor (LFEF), refractive index dispersion, extinction coefficient (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\kappa \)</EquationSource> </InlineEquation>), and resonance quality factor (<i>Q</i>). Thermal effects are incorporated via a modified Drude model accounting for temperature-dependent carrier density and damping rate in the ITO shell. Simulations reveal LSPR redshifts of over 100&#xa0;nm with increasing temperature, accompanied by a monotonic decline in LFEF from above 1500 to below 100 across 300–600&#xa0;K. Quality factors degrade from <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(Q \approx 20\)</EquationSource> </InlineEquation> at room temperature to <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(Q &lt; 4\)</EquationSource> </InlineEquation> at 600&#xa0;K due to increased electron–phonon scattering. Spectral tunability in the 1300–1550&#xa0;nm telecom range is demonstrated, with extinction coefficients maintained below 0.06. These results highlight the potential of CdS@ITO CSQDs as thermally responsive, low-loss components for thermally adaptive photonic systems, including nanoscale optical buffers, modulators, and slow-light devices.</p>

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Temperature tunable plasmonic and optical response of CdS@ITO core-shell quantum dots in the telecom band

  • 期刊论文

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  • 发表日期：

    2025年12月19日

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  • Shewa Getachew Mamo,
  • Asmamaw Tesega Abebe

摘要

We present a detailed theoretical and numerical study on the temperature-tunable plasmonic and optical behavior of CdS@ITO core-shell quantum dots (CSQDs) embedded in dielectric environments. Utilizing the quasi-static approximation and a thermally adaptive Maxwell-Garnett effective medium approach, we systematically analyze how thermal variation modulates key performance metrics, including localized surface plasmon resonance (LSPR), local field enhancement factor (LFEF), refractive index dispersion, extinction coefficient ( \(\kappa \) ), and resonance quality factor (Q). Thermal effects are incorporated via a modified Drude model accounting for temperature-dependent carrier density and damping rate in the ITO shell. Simulations reveal LSPR redshifts of over 100 nm with increasing temperature, accompanied by a monotonic decline in LFEF from above 1500 to below 100 across 300–600 K. Quality factors degrade from \(Q \approx 20\) at room temperature to \(Q < 4\) at 600 K due to increased electron–phonon scattering. Spectral tunability in the 1300–1550 nm telecom range is demonstrated, with extinction coefficients maintained below 0.06. These results highlight the potential of CdS@ITO CSQDs as thermally responsive, low-loss components for thermally adaptive photonic systems, including nanoscale optical buffers, modulators, and slow-light devices.