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Recent advancements in nonreciprocal thermal emitters challenge theconventional Kirchhoff's law, which states that emissivity and absorptivityshould be equal for a given direction, frequency, and polarization. Theseemitters can break Kirchhoff's law and enable unprecedented thermal photoncontrol capabilities. However, current studies mainly focus on increasing themagnitude of the contrast between emissivity and absorptivity, with littleattention paid to how the sign or bandwidth of the contrast may be controlled.In this work, we show such control ability can be achieved by couplingresonances that can provide opposite contrasts between emissivity andabsorptivity.

Controlling The Contrast Between Absorptivity and Emissivity in Nonreciprocal Thermal Emitters