Panadés Josep M, Rutz Nadja, Robert Hadrien M L, Steffen Raphael T, García-Guirado Jose, Tessier Gilles, Quidant Romain, Berto Pascal
Sorbonne Université, CNRS UMR7210, INSERM UMRS968, Institut de la Vision, Paris 75012, France.
Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland.
ACS Photonics. 2024 Oct 8;11(11):4804-4811. doi: 10.1021/acsphotonics.4c01290. eCollection 2024 Nov 20.
As miniaturization becomes a growing trend in optical systems, the ability to precisely manipulate wavefronts within micrometric pupils becomes crucial. Extensive efforts to develop integrated micro-optics primarily led to tunable microlenses. Among these approaches, , which use predesigned microheaters to locally change the refractive index in a transparent thermo-optical material, allow to produce tunable micro-optics with free-form shape. However, the shape and sign of the generated wavefront profile are fixed, predetermined by the geometry of the resistor, which severely limits its use, e.g., for aberration correction. Here, we report a precise reconfigurability of the generated wavefront through dynamic shaping of the temperature distribution, enabled by an independent control of concentric resistors. As a proof of principle, we demonstrate a bimodal that simultaneously acts as a converging/diverging lens and a positive/negative spherical aberration corrector. Through independent control of Zernike modes, this approach paves the way for compact, broadband, transparent and polarization-insensitive wavefront shapers, with a broad range of potential applications, from endoscopy to information technology.
随着光学系统小型化趋势日益明显，在微米级光瞳内精确操纵波前的能力变得至关重要。开发集成微光学的大量努力主要催生了可调微透镜。在这些方法中，利用预先设计的微型加热器在透明热光材料中局部改变折射率的方法，可以制造出具有自由形状的可调微光学元件。然而，所产生的波前轮廓的形状和符号是固定的，由电阻器的几何形状预先确定，这严重限制了其应用，例如像差校正。在此，我们报告通过对同心电阻器的独立控制实现温度分布的动态整形，从而对所产生的波前进行精确重构。作为原理验证，我们展示了一种双峰元件，它同时充当会聚/发散透镜和正/负球差校正器。通过对泽尼克模式的独立控制，这种方法为紧凑、宽带、透明且对偏振不敏感的波前整形器铺平了道路，具有从内窥镜检查到信息技术等广泛的潜在应用。
