Engineering Thermal Radiation Using Bound States in the Continuum

This work presents a novel method to achieve mid-infrared coherent thermal emitters using bound states in the continuum. We show that narrowband emission peaks are realized by adding a dielectric layer to a phononic substrate and forming Friedrich-Wintgen interfering resonances. The phononic metasurface demonstrated here can be employed to design and fabricate the next generation of narrowband coherent light emitters in the mid-infrared wavelengths, opening up new opportunities in the area of on-chip optical communications, sensing, infrared spectroscopy, and photodetection.