Karepov Sharon, De Angelis Costantino, Ellenbogen Tal
Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 6997801, Israel.
Light Matter Interaction Center, Tel Aviv University, Tel Aviv 6997801, Israel.
Nano Lett. 2025 May 21;25(20):8103-8109. doi: 10.1021/acs.nanolett.5c00178. Epub 2025 Apr 3.
Nonlinear metasurfaces have been extensively studied, offering new capabilities to generate and control light. Usually, nonlinear metasurfaces are fabricated on planar substrates where the entire functionality is encoded in the metasurface design. Here, we study a new route to nonlinear metasurface-based optics by coating linear refractive elements with conformable nonlinear metasurface-skin, resulting in hybrid nonlinear refractive elements. We specifically demonstrate a hybrid nonlinear meta-lens composed of a plano-convex linear refractive lens coated with a 400 nm thick nonlinear metasurface membrane. We show that the resulting hybrid element produces light at the second harmonic frequency and focuses it according to the hybrid linear-nonlinear optical functionality. We study the spectral and polarization responses of the hybrid element and demonstrate its ability to generate an image at the second harmonic wavelength. We believe that this demonstration opens the door to a new family of hybrid nonlinear refractive elements for controlling light in new applications.
非线性超表面已得到广泛研究，为光的产生和控制提供了新能力。通常，非线性超表面是在平面衬底上制造的，其全部功能都编码在超表面设计中。在此，我们研究了一种基于非线性超表面光学的新途径，即通过用贴合的非线性超表面“皮肤”包覆线性折射元件，从而得到混合非线性折射元件。我们具体展示了一种混合非线性超透镜，它由一个涂有400纳米厚非线性超表面膜的平凸透镜组成。我们表明，由此产生的混合元件能产生二次谐波频率的光，并根据混合线性 - 非线性光学功能对其进行聚焦。我们研究了该混合元件的光谱和偏振响应，并展示了其在二次谐波波长处生成图像的能力。我们相信，这一展示为用于新应用中控制光的新型混合非线性折射元件家族打开了大门。
