Abadian Sevag, Magno Giovanni, Yam Vy, Dagens Beatrice
Opt Express. 2021 Feb 1;29(3):4091-4104. doi: 10.1364/OE.415969.
Integration of optical isolators remains one the main technological issues of photonic circuits despite several decades of research. We propose a radically new concept which enables performing broad-band isolation even in the case of low-gyrotropy material, opening the road to a new class of non-reciprocal devices using easy-to-integrate composite materials. The principle explores the separation of back-and-forth light paths, induced by the coupled mode asymmetry in magnetoplasmonic slot waveguides. We show numerically that such a structure combined with suitable absorbers gives more than a 18 dB isolation ratio on several tens of nanometers bandwidth, with 2 dB insertion losses.
尽管经过了几十年的研究，但光隔离器的集成仍然是光子电路的主要技术问题之一。我们提出了一个全新的概念，即使在低旋光性材料的情况下也能实现宽带隔离，为使用易于集成的复合材料的新型非互易器件开辟了道路。该原理探索了由磁等离子体狭缝波导中的耦合模式不对称引起的正反光路分离。我们通过数值模拟表明，这种结构与合适的吸收器相结合，在几十纳米的带宽上能给出超过18 dB的隔离比，插入损耗为2 dB。
