Kirigami mechanical metamaterials provide exceptional tunability in mechanical properties and morphing capabilities, exhibiting great potential for deployable and actuatable devices. However, most kirigami structures can only deform freely within a 2D plane, with limited out‐of‐plane deformability, making them inadequate for constructing periodic objects with arbitrary 3D shapes. Here, a novel class of 3D mechanical metamaterials with hyperbolic kirigami tessellations has been developed. By projecting hyperbolic kirigami templates onto three types of triply periodic minimal surfaces, candidate structures are developed with remarkable properties. An extreme negative Poisson's ratio of ‐1 and tunable mechanical multistability are uncovered through theoretical analysis, numerical simulations, and experiments thanks to the flexible kirigami geometry. Notably, the structure achieves a maximum volume expansion of up to 488% during auxetic morphing. Furthermore, programmable morphing behaviors are demonstrated through voxelated assemblies of kirigami unit cells with varying geometrical parameters. The novel design strategy presented in this work based on hyperbolic kirigami tessellations opens up new avenues toward auxetic and multistable mechanical metamaterials with broad applications spanning shape‐morphing architectures, deployable space structures, and soft machines.

Femtosecond laser two-photon polymerization (TPP) technology, known for its high precision and its ability to fabricate arbitrary 3D structures, has been widely applied in the production of various micro/nano optical devices, achieving significant advancements, particularly in the field of photonic wire bonding (PWB) for optical interconnects. Currently, research on optimizing both the optical loss and production reliability of polymeric photonic wires is still in its early stages. One of the key challenges is that inadequate metrology methods cannot meet the demand for multiphysical measurements in practical scenarios. This study utilizes novel in situ scanning electron microscopy (SEM) to monitor the working PWBs fabricated by TPP technology at the microscale. Optical and mechanical measurements are made simultaneously to evaluate the production qualities and to study the multiphysical coupling effects of PWBs. The results reveal that photonic wires with larger local curvature radii are more prone to plastic failure, while those with smaller local curvature radii recover elastically. Furthermore, larger cross-sectional dimensions contribute dominantly to the improved mechanical robustness. The optical-loss deterioration of the elastically deformed photonic wire is only temporary, and can be fully recovered when the load is removed. After further optimization based on the results of multiphysical metrology, the PWBs fabricated in this work achieve a minimum insertion loss of 0.6 dB. In this study, the multiphysical analysis of PWBs carried out by in situ SEM metrology offers a novel perspective for optimizing the design and performance of microscale polymeric waveguides, which could potentially promote the mass production reliability of TPP technology in the field of chip-level optical interconnection.