Authors
Soheil Farazi, Srinivas Tadigadapa
Published in
Physical review letters. Volume 137. Issue 13. Pages 133802. Sep 25, 2026.
Abstract
Thermal radiation is inherently broadband and incoherent, limiting its utility in applications requiring spectral selectivity such as molecular spectroscopy and free-space optical communications. Bound states in the continuum (BICs) provide a powerful route to confine light in open photonic systems and realize resonances with extremely high quality factors. Here we demonstrate high-Q light emission from a photonic-phononic nonlocal metasurface composed of monocrystalline silicon on a 4H-SiC substrate. The platform supports BIC-enabled ultranarrow band emission for both TE and TM polarizations; specifically, we identify an off-Γ Friedrich-Wintgen BIC and a Γ-point symmetry-protected BIC for TE polarization and a Γ-point symmetry-protected BIC for TM polarization. Under TM polarization, coupling between the photonic mode of the metasurface and surface phonon polaritons in the SiC substrate produces strong field localization and a symmetry-enforced complementarity between the photonic and phononic resonances, in which the photonic Q factor diverges while the phononic mode radiates maximally at the Γ point. Using a bonding-based fabrication approach that integrates monocrystalline silicon with SiC through an optically ultrathin interlayer, we experimentally realize a quasi-BIC thermal emitter with a measured Q factor of 181. This represents the highest reported Q factor for thermal emitters operating at wavelengths longer than 7 μm and establishes photonic-phononic nonlocal metasurfaces as a platform for coherent and spectrally selective midinfrared thermal radiation.
PMID:
42854169
Bibliographic data and abstract were imported from PubMed on 10 Oct 2026.
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