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Updated: Jun 5, 2025
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Coherent light-emitting metasurfaces based on bound states in the continuum
Soheil Farazi1, Srinivas Tadigadapa1
1Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, USA.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
Researchers developed novel mid-infrared coherent thermal emitters using dielectric metasurfaces. This breakthrough enables advanced spectroscopy, sensing, and communication technologies by overcoming limitations of spontaneous emitters.
Area of Science:
- Photonics and Metamaterials
- Mid-Infrared Technologies
- Solid-State Light Emitters
Background:
- Current mid-infrared light sources are often spontaneous emitters, limiting applications in spectroscopy, sensing, and communication.
- There is a growing need for solid-state tunable coherent light emitters in the mid-infrared (MIR) range.
Purpose of the Study:
- To demonstrate a new class of coherent thermal emitters operating in the MIR wavelength regime.
- To present the first implementation of off-Γ Friedrich-Wintgen bound states in the continuum (BIC) at MIR wavelengths.
Main Methods:
- Fabrication of a dielectric metasurface on a phononic substrate.
- Numerical analysis of emissivity spectra to identify resonance interference and BIC formation.
- Experimental measurement of emissivity spectra via reflectivity and emission.
Main Results:
- Demonstration of off-Γ Friedrich-Wintgen bound states in the continuum at MIR wavelengths (>7 µm).
- Observation of localized field enhancements within the metasurface.
- Measurement of temporally coherent emission peaks near the BIC resonance.
Conclusions:
- This work presents a novel approach for realizing MIR coherent light emitters.
- The demonstrated Friedrich-Wintgen BIC in MIR metasurfaces opens avenues for next-generation photonic devices.
- The findings have significant implications for advancing technologies in spectroscopy, sensing, and communication.
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