College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Opt Lett. 2012 Oct 1;37(19):4008-10. doi: 10.1364/OL.37.004008.
We show that optical transmission of linearly polarized light through a plasmonic subwavelength metallic grating cascaded with a dielectric grating at a 45° angle to each other is asymmetric in opposite directions. A key characteristic of this asymmetric transmission is that the polarization of the transmitted light is changed. Simulation results reveal that transmission of 0.92 in one direction and 10(-5) in the opposite direction can be obtained at normal incidence at a wavelength of 1550 nm. Because of their high optical performance and loose fabrication requirements, the structures may provide practical applications in the control of light transmission.
我们表明，当线性偏振光以 45°角入射到彼此成角的亚波长金属光栅和介质光栅上时，光的透过率在相反方向上是不对称的。这种不对称传输的一个关键特征是透射光的偏振态发生了变化。模拟结果表明，在 1550nm 波长下，正入射时，一个方向的透过率为 0.92，另一个方向的透过率为 10(-5)。由于其具有高光性能和宽松的制造要求，这些结构可能为光传输的控制提供实际应用。
