结合相变材料与马赫-曾德尔干涉仪调制器结构，设计了一种包含ITO微加热器的非易失性光子多值器件，通过对相变材料的结构参数进行仿真，优化了器件的调制窗口。同时对ITO微加热器的结构进行仿真设计，使微加热器的效率更高，更容易实现器件的多值调制。测试表明，该器件在施加电脉冲的过程中实现了超过32个状态（5 bit）的多值调制。这种电调制的非易失性光子多值器件为大规模的非易失性可配置光子硬件神经网络提供了基础的单元。

Systemic blood circulation is one of life activity’s most important physiological functions. Continuous noninvasive hemodynamic monitoring is essential for the management of cardiovascular status. However, it is difficult to achieve systemic hemodynamic monitoring with the daily use of current devices due to the lack of multichannel and time-synchronized operation capability over the whole body. Here, we utilize a soft microfiber Bragg grating group to monitor spatiotemporal hemodynamics by taking advantage of the high sensitivity, electromagnetic immunity, and great temporal synchronization between multiple remote sensor nodes. A continuous systemic hemodynamic measurement technique is developed using all-mechanical physiological signals, such as ballistocardiogram signals and pulse waves, to illustrate the actual mechanical process of blood circulation. Multiple hemodynamic parameters, such as systemic pulse transit time, heart rate, blood pressure, and peripheral resistance, are monitored using skin-like microfiber Bragg grating patches conformally attached at different body locations. Relying on the soft microfiber Bragg grating group, the spatiotemporal hemodynamic monitoring technique opens up new possibilities in clinical medical diagnosis and daily health management.

裸眼3D显示是“元宇宙”的入口，是可以重新定义人机交互方式的变革性技术。经过百余年发展，裸眼3D显示已取得显著进步，但仍然存在视场角小、分辨率下降严重、运动视差受限和视疲劳等问题。光场裸眼3D显示本质上是多视角光场调控技术和方法研究。最近研究表明，微纳光子器件（衍射光栅、衍射透镜、超表面等）对光的强度、相位、偏振等参量具有灵活而精确的调控能力，有望解决裸眼3D显示长期存在的难题。然而，数英寸至上百英寸显示幅面的微纳光子器件在设计与制备层面都面临巨大挑战。本文具体分析了基于几何光学的裸眼3D显示局限性，从器件设计和微纳制备两方面详细介绍了基于平面光学的裸眼3D显示最新研究进展。最后总结了裸眼3D显示的未来发展方向和潜在应用领域。

硫系玻璃具有超宽的红外透过光谱范围、较高的线性折射率、极高的光学非线性和超快的非线性响应，近年来在集成光子器件研究领域备受关注。首先回顾了硫系玻璃集成光波导的制备，综述了硫系集成光子器件在红外传感和高性能非线性应用方面取得的进展，然后介绍了硫系相变光子器件在光开关、光存储和光计算等方面的前沿进展，最后对目前硫系玻璃光子器件研究存在的问题进行了归纳，并对未来的研究方向进行了展望。

硫化锌（ZnS）晶体是重要的宽光谱红外窗口材料，高深径比纳米孔的超快激光制造技术为中红外波导傅立叶变换光谱仪等光子器件的实现提供了重要的技术途径。本文采用中心波长为1030 nm、重复频率为100 kHz、脉冲宽度为223 fs~20 ps可调的Yb: KGW激光光源，用石英锥镜产生高斯-贝塞尔光束，并用4f系统构建了40倍缩束的超快激光直写系统。在能量为36~63 μJ，脉宽为12.5~20 ps的情况下，在ZnS晶体上成功刻写了直径为80~320 nm的纳米孔结构。通过聚焦离子束（FIB）剥蚀和扫描电子显微镜（SEM）成像确定了纳米孔隙表面形貌、直径及深度信息。研究了激光脉冲能量、脉冲宽度对纳米孔隙的影响。结果表明，在20 ps脉冲宽度、48 µJ脉冲能量的激光参数下，纳米孔隙的深度约为270 μm。

Integrated photonics is attracting considerable attention and has found many applications in both classical and quantum optics, fulfilling the requirements for the ever-growing complexity in modern optical experiments and big data communication. Femtosecond (fs) laser direct writing (FLDW) is an acknowledged technique for producing waveguides (WGs) in transparent glass that have been used to construct complex integrated photonic devices. FLDW possesses unique features, such as three-dimensional fabrication geometry, rapid prototyping, and single step fabrication, which are important for integrated communication devices and quantum photonic and astrophotonic technologies. To fully take advantage of FLDW, considerable efforts have been made to produce WGs over a large depth with low propagation loss, coupling loss, bend loss, and highly symmetrical mode field. We summarize the improved techniques as well as the mechanisms for writing high-performance WGs with controllable morphology of cross-section, highly symmetrical mode field, low loss, and high processing uniformity and efficiency, and discuss the recent progress of WGs in photonic integrated devices for communication, topological physics, quantum information processing, and astrophotonics. Prospective challenges and future research directions in this field are also pointed out.

Optical waveguides are far more than mere connecting elements in integrated optical systems and circuits. Benefiting from their high optical confinement and miniaturized footprints, waveguide structures established based on crystalline materials, particularly, are opening exciting possibilities and opportunities in photonic chips by facilitating their on-chip integration with different functionalities and highly compact photonic circuits. Femtosecond-laser-direct writing (FsLDW), as a true three-dimensional (3D) micromachining and microfabrication technology, allows rapid prototyping of on-demand waveguide geometries inside transparent materials via localized material modification. The success of FsLDW lies not only in its unsurpassed aptitude for realizing 3D devices but also in its remarkable material-independence that enables cross-platform solutions. This review emphasizes FsLDW fabrication of waveguide structures with 3D layouts in dielectric crystals. Their functionalities as passive and active photonic devices are also demonstrated and discussed.