论文标题
硝酸锂锂中的电兴非转向极化旋转
Electro-optic non-reciprocal polarization rotation in lithium niobate
论文作者
论文摘要
极化是光的基本自由度，并在自由空间和光纤中被广泛利用。通过磁性法拉第效应启用了非转向偏振旋转，对于宽带隔离器和循环器而言，基本上是无与伦比的。但是，对于集成的光子型铸造厂，仍然没有生产低损坏的磁磁组件的良好途径，这促使人们搜索了不使用偏振旋转的替代方案。此外，磁化材料往往会高度损失，虽然可以实现较大的（10-100 rad/cm）极化旋转，但功绩的关键（每损旋转）通常<1 rad/db。在这里，我们证明了宽带非转向极化旋转可以使用纳米摄影设备中的电透明产生。我们的示范利用了尼替伯锂在780 nm附近的电流跨极化散射，其中互惠性在带有合成动量的射频刺激的帮助下破裂。虽然所证明的电磁偏振旋转速率约为1 rad/cm，但尼伯特锂的异常低损失可以使非对偏振旋转器具有优点数字，其优点是1-2个质量级数，远比磁磁性能力更好。可以在III-V平台中复制这种方法，为具有协调的单片隔离器的高性能激光器铺平道路。
Polarization is a fundamental degree of freedom for light and is widely leveraged in free space and fiber optics. Non-reciprocal polarization rotation, enabled via the magneto-optic Faraday effect, has been essentially unbeatable for broadband isolators and circulators. For integrated photonics foundries, however, there is still no good path to producing low-loss magneto-optic components, which has prompted a search for alternatives that do not use polarization rotation. Moreover, magneto-optic materials tend to be highly lossy, and while large (10-100 rad/cm) polarization rotation can be achieved, the key figure of merit (rotation-per-loss) is typically < 1 rad/dB. Here, we demonstrate that broadband non-reciprocal polarization rotation can be produced using electro-optics in nanophotonic devices. Our demonstration leverages electro-optic inter-polarization scattering around 780 nm in lithium niobate, in which the reciprocity is broken with the help of a radiofrequency stimulus that carries synthetic momentum. While the demonstrated electro-optic polarization rotation rate is approximately 1 rad/cm, the exceptionally low loss of lithium niobate enables non-reciprocal polarization rotators with figures of merit that are 1-2 orders-of-magnitude better than what is possible with magneto-optics. This approach can be replicated in III-V platforms paving the way for high-performance lasers with co-integrated monolithic isolators.
