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Thermal emission from a hot body is ubiquitous, yet its properties remaininherently challenging to control due to its incoherent nature. Recent advancesin thermal emission manipulation have been unveiling exciting phenomena and newopportunities for applications. In particular, judiciously patterned nanoscalefeatures over their surface have been shown to channel emission sources intopartially coherent beams with tailored directionality and frequencyselectivity. Yet, more sophisticated forms of control, such as spin-selectiveand unidirectional thermal emission have remained elusive. Here, weexperimentally demonstrate single-layer metasurfaces emitting unidirectional,narrowband thermal light in the infrared with arbitrary polarization states -an operation enabled by photonic bound states in the continuum locally tailoredby a geometric phase controlling the temporal and spatial coherence of emittedlight. The demonstrated platform paves the way to a compactification paradigmfor metasurface optics, in which thermal emission or photoluminescence can feedarbitrarily patterned beams without the need of external coherent sources.

Arbitrarily polarized and unidirectional emission from thermal metasurfaces