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Controlling the Sign and Magnitude of the Thermoreflectance Coefficient of Gold-MoS2 Metamaterials

  • D. Saleta Reig
  • B. Liu
  • K. Xu
  • J. S. Reparaz
  • K. -J. Tielrooij
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Abstract

Heating a material changes how much light it reflects. This effect, quantified by the thermoreflectance coefficient CTR, enables temperature sensing, while it is a nuisance for situations where constant reflection is crucial. Whereas temperature detection requires a large CTR, the latter situation demands it to be as close to zero as possible. Controlling the CTR has so far relied on the selection of materials and wavelengths, rather than engineering the coefficient itself. This work demonstrates that the CTR of a 50 nm thin gold film on SiO2/Si can be controlled in sign and magnitude by an ultrathin (<8 nm) MoS2 film underneath it. Time-resolved thermoreflectance measurements reveal suppression, sign inversion, and revival of the thermoreflectance signal, controlled by three knobs: (i) the buried MoS2 thickness, (ii) probe wavelength, and (iii) ambient temperature. Transfer-matrix simulations using temperature-dependent dielectric functions of gold and MoS2 reproduce all experimental observations, demonstrating an optothermal metamaterial platform with controllable properties. In particular, these (anti-)thermoreflective metamaterial mirrors bring CTR under the same interference design rules previously applied to the optical response itself, opening ways to maximize or minimize the temperature dependence of the optical reflectance, tailored to the specific application.

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Cite

BibTeXRIS
BibTeX
@misc{reig2026controlling,
  title = {{Controlling the Sign and Magnitude of the Thermoreflectance Coefficient of Gold-MoS$_2$ Metamaterials}},
  author = {D. Saleta Reig and B. Liu and K. Xu and J. S. Reparaz and K. -J. Tielrooij},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.02024},
  eprint = {2611.02024},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.02024},
}
RIS
TY  - UNPB
TI  - Controlling the Sign and Magnitude of the Thermoreflectance Coefficient of Gold-MoS_2 Metamaterials
AU  - D. Saleta Reig
AU  - B. Liu
AU  - K. Xu
AU  - J. S. Reparaz
AU  - K. -J. Tielrooij
PY  - 2026
DA  - 2026/11/01
PB  - arXiv
DO  - 10.48550/arxiv.2611.02024
UR  - https://arxiv.org/abs/2611.02024
AB  - Heating a material changes how much light it reflects. This effect, quantified by the thermoreflectance coefficient C_TR, enables temperature sensing, while it is a nuisance for situations where constant reflection is crucial. Whereas temperature detection requires a large C_TR, the latter situation demands it to be as close to zero as possible. Controlling the C_TR has so far relied on the selection of materials and wavelengths, rather than engineering the coefficient itself. This work demonstrates that the C_TR of a 50 nm thin gold film on SiO_2/Si can be controlled in sign and magnitude by an ultrathin (<8 nm) MoS_2 film underneath it. Time-resolved thermoreflectance measurements reveal suppression, sign inversion, and revival of the thermoreflectance signal, controlled by three knobs: (i) the buried MoS_2 thickness, (ii) probe wavelength, and (iii) ambient temperature. Transfer-matrix simulations using temperature-dependent dielectric functions of gold and MoS_2 reproduce all experimental observations, demonstrating an optothermal metamaterial platform with controllable properties. In particular, these (anti-)thermoreflective metamaterial mirrors bring C_TR under the same interference design rules previously applied to the optical response itself, opening ways to maximize or minimize the temperature dependence of the optical reflectance, tailored to the specific application.
ER  -