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Probing Temperature Changes Using Nonradiative Processes in Hyperbolic Meta-Antennas
Nils Henriksson1, Alessio Gabbani2,3, Gaia Petrucci2
1Department of Physics, Umeå University, Linnaeus väg 24, 901 87 Umeå, Sweden.
ACS Applied Optical Materials
|January 2, 2025
Summary
Hyperbolic meta-antennas can act as sensitive thermometers by monitoring nonradiative optical processes. These processes, unlike radiative ones, are strongly affected by temperature changes due to electron-phonon scattering.
Area of Science:
- Plasmonics and Nanophotonics
- Metamaterials
- Optical Spectroscopy
Background:
- Multilayered metal-dielectric nanostructures exhibit plasmonic behavior and hyperbolic optical dispersion.
- This leads to distinct radiative and nonradiative channels in their extinction spectra.
- These properties offer potential for multifunctional systems controlling light-matter interactions across different wavelengths.
Purpose of the Study:
- Investigate the temperature dependence of optical properties in hyperbolic meta-antennas.
- Determine if radiative and nonradiative processes can probe surrounding medium temperature changes.
- Explore the underlying mechanisms of temperature-induced optical property variations.
Main Methods:
- Experimental measurements of optical properties of hyperbolic meta-antennas at varying temperatures.
- Theoretical modeling using temperature-dependent effective medium theory.
- Analysis of electron-phonon scattering effects on optical damping.
Main Results:
- Radiative processes in hyperbolic meta-antennas show minimal temperature dependence.
- Nonradiative processes are highly sensitive to external temperature variations.
- Enhanced damping due to electron-phonon scattering significantly impacts nonradiative modes.
- A red-shift in the nonradiative mode is observed with small temperature increases, unlike standard plasmonic systems.
Conclusions:
- Nonradiative processes in hyperbolic meta-antennas are crucial for sensing temperature changes.
- These nanostructures can function as highly sensitive thermometers using linear absorption spectroscopy.
- Exploiting plasmonic excitations in these systems enables precise temperature probing.
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