Shen Bing, Polson Randy, Menon Rajesh
Opt Express. 2015 Apr 20;23(8):10847-55. doi: 10.1364/OE.23.010847.
We applied nonlinear optimization to design integrated digital metamaterials in silicon for unidirectional energy flow. Two devices, one for each polarization state, were designed, fabricated, and characterized. Both devices offer comparable or higher transmission efficiencies and extinction ratios, are easier to fabricate, exhibit larger bandwidths and are more tolerant to fabrication errors, when compared to alternatives. Furthermore, each device footprint is only 3μm × 3μm, which is the smallest optical diode ever reported. To illustrate the versatility of digital metamaterials, we also designed a polarization-independent optical diode.
我们应用非线性优化方法来设计硅基集成数字超材料，以实现单向能量流。设计、制造并表征了两种器件，每种器件对应一种偏振态。与其他替代方案相比，这两种器件都具有相当或更高的传输效率和消光比，更易于制造，带宽更大，对制造误差的容忍度更高。此外，每个器件的尺寸仅为3μm×3μm，这是有史以来报道的最小光学二极管。为了说明数字超材料的通用性，我们还设计了一种偏振无关的光学二极管。
