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Temperature tunable plasmonic and optical response of CdS@ITO core-shell quantum dots in the telecom band
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Temperature tunable plasmonic and optical response of CdS@ITO core-shell quantum dots in the telecom band
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Journal Article
Temperature tunable plasmonic and optical response of CdS@ITO core-shell quantum dots in the telecom band
2025
Overview
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 (), 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 at room temperature to 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.Highlights• Demonstrate thermal tuning of plasmonic resonances (1300-1550 nm) for adaptive photonicdevices.• Maintain strong field enhancement and low optical losses up to 600 K, providing a CMOScompatiblealternative to gold and silver.• Enable tunable slow-light effects and improved thermal stability via geometric optimizationof ITO shells.
