We experimentally demonstrate a broadband and an ultra-broadband spectral bandwidth polarization rotators. Both polarization rotators have modular design, that is, they are comprised of an array of half-wave plates rotated to a given angle. We show that the broadband and ultra-broadband performance of the polarization rotators is due to the adiabatic nature of the light polarization evolution. In this paper we experimentally investigate the performance of broadband and ultra-broadband polarization rotators comprising of ten multi-order half-wave plates or ten commercial achromatic half-wave plates, respectively. The half-wave plates in the arrays are rotated gradually with respect to each other starting from an initial alignment between the fast polarization axis of the first one and the incoming linearly polarized light, to the desired polarization rotation angle.
Lossless broadband adiabatic polarizing beam splitting in a plasmonic system
量子物理学和光学之间有趣的类比激发了非传统集成光子器件的设计。在本文中，我们数值演示了一个宽带集成偏振分束器（PBS）通过实施受激拉曼绝热通过（STIRAP）技术在三波导等离子体系统。我们提出的PBS具有>250 nm的TM带宽和<-40 dB extinction and ><-20 dB消光的150 nm TE带宽，覆盖整个S-、C-和L-波段以及部分E-波段。此外，在我们的系统中实现了近无损的光传输，尽管纳入了等离子体激元混合波导，因为独特的损失减轻功能的STIRAP计划。通过这种方法，可以实现以前不可能实现的各种宽带集成器件，这将允许集成光学的创新。
Adiabatic following of terahertz surface plasmon-polaritons coupler via two waveguides structure
最近，两篇引人注目的论文[New J. Phys. 21，113004（2019）; IEEE J. Sel. Top. Quantum Electron 27，1（2020）]提出了通过应用相干量子控制的宽带完全转移太赫兹（THz）表面等离子体激元（SPP）波导耦合器-受激拉曼绝热通道（STIRAP）。然而，以前的研究需要三个SPP波导耦合器。本文提出了一种新的宽带全转移太赫兹表面等离子体耦合器的设计，它采用了一种新颖的双波导结构，采用了两态绝热跟随。为了实现这一设计，我们首次在表面等离子体光波导的耦合方程中引入了失谐量。我们相信，这一发现将改善太赫兹通信领域。
Smooth-Curvature Bend Design Guided by Variational Analysis for Adiabatic Multimode Integrated Photonics
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology（华中科技大学武汉国家光电研究中心）；School of Optical and Electronic Information, Huazhong University of Science and Technology（华中科技大学光学与电子信息学院）；Optics Valley Laboratory（光谷实验室）
Ultra-broadband, Low-loss Wavelength Combiners and Filters: Novel Designs and Experiments in Thin-film Lithium Niobate
University of Massachusetts Amherst（马萨诸塞大学阿默斯特分校）；CREOL, The College of Optics and Photonics, University of Central Florida（中佛罗里达大学光学与光子学院 CREOL）；Mount Holyoke College（曼荷利女子学院）
