High-Q resonance engineering in momentum space for highly coherent and rainbow-free thermal emission
Co-first author
Research overview
Problem
Coherent thermal emission needs both a narrow spectrum and a confined emission angle. How can the angle-dependent rainbow effect be suppressed?
Mechanism
Preserve the high Q of an isolated BIC near the Γ point while far-field coupling between modes in different polarization channels lowers Q away from Γ, suppressing unwanted emission.
Result
Ternary-grating experiments demonstrate thermal emission near 6.5 μm with a 23 nm bandwidth, confined within a 2° angular range, combining temporal and spatial coherence.
- Journal
- Nano Letters
- Year
- 2025
- DOI
Related topics
Photonic crystals ↗
Preview versionAdvance article PDF · Nano Letters (2025). Issue and page numbers are placeholders in this source and remain unchanged in the preview. Use the DOI's journal record for the final citation.
Related reading
Cavity-assisted nonlocal metasurfaces for momentum-space broadband-operational optical vortice generation with maximum efficiency approaching 80%
Cavity-assisted nonlocal metasurfaces for optical-vortex generation, with a focus on the operating range in momentum space and conversion efficiency.
Structured coherent thermal emission from non-Hermitian metasurfaces
Resonance and radiation control in non-Hermitian metasurfaces for coherent thermal emission with directionality and polarization structure.
Anomalous spontaneous emission enhancement by bound states in the continuum in nonlocal metasurfaces
Investigating the relationship between bound states in the continuum and enhanced spontaneous emission in nonlocal metasurfaces.