Nanophotonics杂志资讯|非线性纳米光子学前沿特刊

学术科学 2024-08-26 09:01 中国香港

近日，Nanophotonics杂志特别邀请俄罗斯ITMO大学的Andrey A. Bogdanov教授、Sergey Makarov教授和澳洲国立大学的Yuri S Kivshar教授牵头并组织编撰了非线性纳米光子学前沿特刊，收录了各种纳米光子学结构中非线性光学效应的最新研究进展。

在特刊社论中，几位教授写道：

"1961年，得益于激光的发明及由此提高的相干光功率，Peter Franken等人首次在石英晶体板中激发了二次谐波，非线性光学自此诞生。随着电子束曝光、聚焦离子束铣削、先进沉积法等纳米制备技术的出现，纳米级精度制备成为可能，科学家们开始进一步探索和利用纳米尺度下的非线性光学效应，这推动了非线性纳米光子学的发展。如今，非线性纳米光子学是光学中最有前景的方向之一，可应用于包括生物医学成像、环境感测、安全通信、量子计算等诸多领域。

本特刊收录有33篇原创研究论文和4篇专题综述文章，均有关非线性纳米光子学领域的前沿研究及最新进展，具体收录文章概况如图1 所示。

图1 非线性纳米光子学前沿特刊收录文章概览

本刊收录了S.Psilodimitrakopoulos等人关于二维材料，特别是金属硫化物和钙钛矿材料中二次谐波产生（SHG），及偏振解析SHG性质、非线性光学响应理论框架的综述文章[1]；Y. Wang等人总结纳米光子学中具有高折射率、可见光高透度和非线性光学特性的磷化镓（GaP）的材料性质、制备技术和器件集成的综述文章[2]；W. Geng等人回顾非线性集成光子学的进展，强调其与CMOS兼容性、能源效率、成本效益并涵盖关键非线性效应及材料、超连续谱产生及片上光频梳的综述文章[3]；Y. Lu等人关注高功率THz源诱导非线性光学效应探讨其在通信、传感和生物医学应用中的潜力，回顾THz非线性物理和材料调制最新进展的综述文章[4]。

SHG是各类纳米光子结构中最常见的非线性效应之一，目前仍有较高的研究热度。本特刊收录了从理论和实验两方面研究包括硅纳米颗粒、Si/SiO2多孔材料、磷化镓和AlGaAs超表面等半导体纳米结构中SHG的研究论文[5],[6]；观察AlGaAs超表面二次谐波信号中异常固有非线性几何相位的研究论文[7]；讨论另一种具有增强的二阶光学非线性、可用于高效的电光调制、与CMOS兼容可用于集成非线性光子器件的材料AlScN的研究论文[8]；精确控制等离激元二聚体不对称性以显著增强其二次谐波信号的研究论文[9]；将散射体不对称性与强度相关介电常数结合产生强非对称行为，从而实现非线性散射体在激发方向隐身同时反向强散射的研究论文[10]。

特刊封面文章通过优化V形金纳米天线构成矩形超光栅阵列的间距，将衍射级次与单天线辐射对齐以最大化SHG信号[11]; 系统研究不同激发功率下等离激元纳米颗粒的光致发光行为，并揭示PL可以从等离激元增强辐射过渡到类似黑体辐射状态[12]。

另一类二阶非线性效应是和频产生（SFG）。本特刊亦收录了基于多目标拓扑优化超表面普适理论框架实现10 nm信号工作带宽内效率超过0.2cm2/GW和频产生的研究论文[13]；将相变材料Ge2Sb2Te5（GST）与混合电介质超表面集成实现可调谐三次谐波发生（THG）的研究论文[14]；以及实验探索与CMOS兼容的Si3N4波导中相位匹配THG的研究论文[15]。

非线性纳米光子学领域近期的另一类重要进展是纳米尺度光学高阶非线性效应的增强与调制。本特刊收录了利用SiC超薄膜实现两数量级增强的五次谐波产生（FHG）的研究论文[16]；利用ZnO大非线性系数、宽透明窗口显著增强微线中FWM混频相位匹配的研究论文[17]；利用GST中高次谐波产生（HHG）实现可逆光学相位切换并动态调控谐波辐射，由此有望引入GST实现主动式可调超表面和集成化超快光学控制的研究工作[18]；独立几何控制连续态中多个准束缚态并通过波混频过程调制其相互作用，由此有望实现信息复用、多波长传感及非线性成像的研究工作[19]。

二维材料具有原子级薄度，同时有强光-物质相互作用，因此有强吸收/辐射和非线性光学性质，可用于光电探测器、发光器件、调制器和非线性光子元件等各种光电应用。特刊收录有研究MoSe2, MoS2, WSe2等二维材料与支持高Q谐振超表面相互作用所致非线性光学性质增强的研究论文[20-22]；利用4层PtSe2实现超机械剥离MoS2约两数量级强非线性响应的研究论文[23]；利用LiNbO3非线性光子晶体跨越八度分隔波长高效产生光学角动量光束的研究论文[24]；通过优化电场分布克服薄膜锂铌酸锂脊形波导中制备高质量铁电畴的缺陷，实现接近理论极限60%，即，约1,720 % W−1 cm−2归一化转换效率的研究论文[25]；证明蜂窝状电介质超表面中Kekule拓扑角态SHG和THG增强不受角落几何形状影响的研究论文[26]；证明位错晶格核心局域有无阈涡旋孤子，其高阶拓扑绝缘体性质表现出强场约束和高增强稳定性，并可通过功率控制其传播常数和定域性的研究论文[27]。

连续态束缚态（BICs）的高品质因子和强空间约束可显著增强纳米尺度上的光与物质相互作用及非线性光学响应。特刊另收录有利用光子晶体光栅BIC实现与类Dirac色散激子-极化子强耦合和超低阈值凝聚的研究论文[28]；利用电介质BIC超表面增强耦合J-聚集物膜辐射特性以实现发光强度5倍Purcell增强和定向辐射的研究论文[29]；探究高折射率片（锂铌酸盐或硅氮化物）与两低折射率波导集成、支持BIC的新型CMOS兼容结构如何在无需严格几何控制的情况下产生高品质因子，未来或可实现超窄带宽滤波器等的研究论文[30]。

近年来，纳米光子学的发展还推动了量子信息处理（QIP）方面的重大进展。特刊收录有实现带宽达17 THz 高亮度周期极化锂铌酸盐飞秒双光子源的研究论文[31]；探究纠缠光子对生成以及法布里-珀罗干涉效应的研究论文[32]；利用非线性超表面实现光子对发射角度精确控制，生成高巧合/偶然比角度可调光子对的研究论文[33]。

此外，全光调制器的发展消除了调制带宽的限制，对于推进未来信息处理技术至关重要。本特刊收录了利用光子拓扑绝缘体和金属量子芯片内超快全光调制器克服调制效率、带宽和紧凑尺寸等诸多限制的研究论文[34]；基于强光热相互作用，利用晶态硅纳米颗粒中拉曼散射与局部温度的非线性关系实现纳米尺度高效全光调制的研究论文[35]；利用薄膜铅锆钛基底实现超40%调制深度的片上等离激元电光调制器的研究论文[36]；以及利用钙钛矿材料与CMOS传感器芯片集成实现微型光谱仪的研究论文[37]。”

综上所述，本特刊全面介绍了非线性纳米光子学领域的最新研究进展。最后，由衷感谢所有作者对本特刊的贡献；衷心希望此特刊能吸引更多科学家加入非线性纳米光子学这一飞速发展的研究领域，从而推动该领域的进一步发展。

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