由两个各向同性介质制成的非平行光栅实现的单向传输。
Unidirectional transmission realized by two nonparallel gratings made of isotropic media.
机构信息
College of Optoelectics Science and Engineering, National University of Defense Technology, Changsha, 410073, China.
出版信息
Opt Lett. 2011 Aug 1;36(15):2842-4. doi: 10.1364/OL.36.002842.
We realize a unidirectional transmission by cascading two nonparallel gratings (NPGs) made of isotropic, lossless, and linear media. For a pair of orthogonal linear polarizations, one of the gratings is designed as a polarizer, which is a reflector for one polarization and a transmitter for the other; another grating is designed as a polarization converter, which converts most of one polarized incident wave into another polarized transmitted wave. It is demonstrated by numerical calculation that more than 85% of the incident light energy can be transmitted with less than 1% transmission in the opposite direction for linearly polarized light at normal incidence, and the relative bandwidth of the unidirectional transmission is nearly 9%. The maximum transmission contrast ratio between the two directions is 62 dB. Unlike one-way diffraction grating, the transmitted light of the NPGs is collinear with the incident light, but their polarizations are orthogonal.
我们通过级联两个由各向同性、无损耗和线性介质制成的非平行光栅（NPG）实现单向传输。对于一对正交线性偏振，一个光栅设计为偏振器，对于一个偏振是反射器，对于另一个偏振是透射器；另一个光栅设计为偏振转换器，它将大部分入射的一个偏振波转换为另一个偏振透射波。数值计算表明，对于正常入射的线性偏振光，超过 85%的入射光能量可以以小于 1%的反向传输传输，单向传输的相对带宽接近 9%。两个方向的最大传输对比度为 62dB。与单向衍射光栅不同，NPG 的透射光是与入射光共线的，但它们的偏振是正交的。
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