Zong Shu, Cai Shijie, Liu Xiaoshan, Chen Juan, Liu Guiqiang, Chen Jing, Tang Chaojun, Liu Zhengqi
Opt Lett. 2024 Oct 15;49(20):5731-5734. doi: 10.1364/OL.537664.
Chiral metasurfaces hold excellent performance in enhancing spin-dependent light-matter interaction, showing broad application prospects in areas such as chiral imaging, chiral light sources, and chiral sensing. However, utilizing resonant metasurfaces to achieve all-optical logic gates has not been reported yet. In this work, dual-channel intrinsic and nonlinear chiroptical responses are achieved on lithium niobate metasurfaces. The combination of bound states in the continuum (BICs) resonant modes with chiral metasurfaces has revealed its linear and nonlinear chirality. The metasurface achieves linear circular dichroism above 0.9 and nonlinear circular dichroism close to 0.9 on the dual-band. Based on the second-order nonlinear chiroptical response, multiple all-optical logic gates (including NOT, OR, NAND, AND, and NOR) can be realized on the chiral metasurfaces. Our results confirm the operability of resonant metasurfaces in realizing all-optical logic gates, offering a potentially promising approach for the development of new, to the best of our knowledge, all-optical logic devices.
手性超表面在增强自旋相关的光与物质相互作用方面具有出色性能，在手性成像、手性光源和手性传感等领域展现出广阔的应用前景。然而，利用共振超表面实现全光逻辑门尚未见报道。在这项工作中，在铌酸锂超表面上实现了双通道本征和非线性手性光学响应。连续域束缚态（BICs）共振模式与手性超表面的结合揭示了其线性和非线性手性。该超表面在双波段实现了大于0.9的线性圆二色性和接近0.9的非线性圆二色性。基于二阶非线性手性光学响应，在手性超表面上可实现多个全光逻辑门（包括非门、或门、与非门、与门和或非门）。我们的结果证实了共振超表面在实现全光逻辑门方面的可操作性，为开发据我们所知新型的全光逻辑器件提供了一种潜在的有前景的方法。
