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Spectrally stable thermal emitters enabled by material-based high-impedance surfaces.
David Navajas1, José M Pérez-Escudero1, Iñigo Liberal1
1Department of Electrical, Electronic and Communications Engineering, Institute of Smart Cities (ISC), Public University of Navarre (UPNA) 31006 Pamplona Spain david.navajas@unavarra.es inigo.liberal@unavarra.es.
Nanoscale Advances
|February 9, 2023
Summary
Metallic thermal emitters with stable, narrowband spectra were developed using epsilon-near-zero (ENZ) substrates. These emitters are ideal for heat management, communication, and sensing applications due to their robustness and cost-effectiveness.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Radiative thermal engineering is crucial for heat and energy management, communication, and sensing.
- Subwavelength metallic bodies are key components in these applications.
- Controlling emission spectra is vital for device performance.
Purpose of the Study:
- To demonstrate metallic thermal emitters with narrowband and stable emission spectra.
- To investigate emitters based on epsilon-near-zero (ENZ) substrates.
- To develop emitters compatible with large-area and low-cost applications.
Main Methods:
- Numerical simulations and experimental validation.
- Fabrication of metallic thermal emitters on ENZ substrates.
- Characterization of emission spectra under varying conditions (thickness, angle, polarization).
Main Results:
- Achieved narrowband and extremely stable emission spectra.
- Demonstrated that resonant frequency is independent of nanofilm thickness, observation angle, and polarization.
- Utilized ENZ substrates as material-based high-impedance substrates.
Conclusions:
- The developed metallic thermal emitters offer robust and tunable thermal emission.
- ENZ-based emitters are suitable for advanced heat management, communication, and sensing.
- The fabrication process is compatible with large-area and low-cost manufacturing.
