We investigate a bi-layer scheme for circularly polarized infrared thermal radiation. Our approach takes advantage of the strong anisotropy of low-symmetry materials such as β-GaO and α-MoO. We numerically report narrow-band, high degree of circular polarization (over 0.85), thermal radiation at two typical emission frequencies related to the excitation of β-GaO optical phonons. Optimization of the degree of circular polarization is achieved by a proper relative tilt of the crystal axes between the two layers. Our simple but effective scheme could set the basis for a new class of lithography-free thermal sources for IR bio-sensing.

中文翻译：

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α-MoO3/β-Ga2O3 扭曲层中高圆偏振热辐射的优化


我们研究了圆偏振红外热辐射的双层方案。我们的方法利用了 β-GaO 和 α-MoO 等低对称性材料的强各向异性。我们以数值方式报告了与 β-GaO 光学声子激发相关的两个典型发射频率下的窄带、高圆偏振度（超过 0.85）热辐射。圆偏振度的优化是通过两层之间晶轴的适当相对倾斜来实现的。我们简单但有效的方案可以为用于红外生物传感的新型无光刻热源奠定基础。