Local control of polarization and geometric phase in thermal metasurfaces

被引:9
|
作者
Nolen, J. Ryan [1 ]
Overvig, Adam C. [1 ]
Cotrufo, Michele [1 ]
Alu, Andrea [1 ,2 ]
机构
[1] CUNY, Adv Sci Res Ctr, Photon Initiat, New York, NY 10017 USA
[2] CUNY, Grad Ctr, Phys Program, New York, NY 10017 USA
关键词
BOUND-STATES; COHERENT EMISSION; RADIATION; LIGHT; LAWS;
D O I
10.1038/s41565-024-01763-6
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Thermal emission from a hot body is inherently challenging to control due to its incoherent nature. Recent advances have shown that patterned surfaces can transform thermal emission into partially coherent beams with tailored directionality and frequency selectivity. Here we experimentally demonstrate polarization-selective, unidirectional and narrowband thermal emission using single-layer metasurfaces. By implementing polarization gradients across the surface, we unveil a generalization of the photonic Rashba effect from circular polarizations to any pair of orthogonal polarizations and apply it to thermal emission. Leveraging pointwise specification of arbitrary elliptical polarization, we implement a thermal geometric phase and leverage it to prove previous theoretical predictions that asymmetric chiral emission is possible without violating reciprocity. This general platform can be extended to other frequency regimes in efforts to compactify metasurface optics technologies without the need for external coherent sources. A metasurface is used to generalize the Rashba effect from circular polarizations to any polarization state for thermal emission.
引用
收藏
页码:1627 / 1634
页数:10
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