Isayama Yuri H, Hernández-Figueroa Hugo E
Center for Semiconductor Components and Nanotechnology, University of Campinas, Campinas, Sao Paulo, 13083-870 Brazil.
School of Electrical and Computer Engineering, Univeristy of Campinas, Campinas, Sao Paulo, 13083-852 Brazil.
Opt Quantum Electron. 2023;55(5):454. doi: 10.1007/s11082-023-04751-7. Epub 2023 Mar 31.
A novel hybrid multimode interferometer for sensing applications operating with both TE and TM polarizations simultaneously is proposed and numerically demonstrated. The simulations were performed assuming an operating wavelength of 633 nm with the goal of future use as a biosensor, but its applications extend beyond that area and could be adapted for any wavelength or application of interest. By designing the mutimode waveguide core with a low aspect ratio, the confinement characteristics of TE modes and TM modes become very distinct and their interaction with the sample in the sensing area becomes very different as well, resulting in high device sensitivity. In addition, an excitation structure is presented, that allows good control over power distribution between the desired modes while also restricting the power coupled to other undesired modes. This new hybrid TE/TM approach produced a bulk sensitivity per sensor length of 1.798 rad and a bulk sensitivity per sensor area of 2.140 rad , which represents a much smaller footprint when compared to other MMI sensors, contributing to a higher level of integration, while also opening possibilities for a new range of MMI devices.
本文提出并通过数值模拟验证了一种新型混合多模干涉仪，该干涉仪可同时在TE和TM两种偏振态下工作以用于传感应用。模拟是在假设工作波长为633 nm的条件下进行的，目标是未来用作生物传感器，但其应用范围不仅限于此领域，还可适用于任何感兴趣的波长或应用。通过设计低纵横比的多模波导芯，TE模式和TM模式的限制特性变得非常明显，并且它们在传感区域与样品的相互作用也变得非常不同，从而提高了器件的灵敏度。此外，还提出了一种激励结构，该结构可以很好地控制所需模式之间的功率分布，同时还能限制耦合到其他不需要模式的功率。这种新的混合TE/TM方法产生的每传感器长度的整体灵敏度为1.798 rad，每传感器面积的整体灵敏度为2.140 rad，与其他MMI传感器相比，占地面积更小，有助于实现更高的集成度，同时也为一系列新的MMI器件开辟了可能性。
