Probing macroscopic temperature changes with non-radiative processes in hyperbolic meta-antennas
arxiv(2024)
摘要
Multilayered metal-dielectric nanostructures display both strong plasmonic
behavior and hyperbolic optical dispersion. The latter is responsible for the
appearance of two separated radiative and non-radiative channels in the
extinction spectrum of these structures. This unique property can open a wealth
of opportunities towards the development of multifunctional systems that
simultaneously can behave as optimal scatterers and absorbers at different
wavelengths, an important feature to achieve multiscale control light-matter
interactions in different spectral regions for different types of applications,
such as optical computing or detection of thermal radiation. Nevertheless, the
temperature dependence of the optical properties of these multilayered systems
has never been investigated. In this work we study how radiative and
non-radiative processes in hyperbolic meta-antennas can probe temperature
changes of the surrounding medium. We show that, while radiative processes are
essentially not affected by a change in the external temperature, the
non-radiative ones are strongly affected by a temperature variation. By
combining experiments and temperature dependent effective medium theory, we
find that this behavior is connected to enhanced damping effects due to
electron-phonon scattering. Contrary to standard plasmonic systems, a red-shift
of the non-radiative mode occurs for small variations of the environment
temperature. Our study shows that to probe temperature changes it is essential
to exploit non-radiative processes in systems supporting plasmonic excitations,
which can be used as very sensitive thermometers via linear absorption
spectroscopy.
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