Fig. 1. (a) Illustration of micro-transfer printing by anisotropic wet etching^[30]; (b) Silicon photonics chip using transfer printing with BCB^[26]; (c) Schematic of transfer printing using capillary bonding^[31]

Fig. 2. (a) Illustration and optical images of the graphene-assisted micro-transfer printing process^[35]; (b) Transfer of metals including Cu, Ag, Au, Pt, Ti and Ni on SiO₂^[35]

Fig. 3. (a) Illustration of the laser-assisted micro-transfer printing process^[36]; (b) The device printed onto steel sphere, glass hemisphere, dry petal^[36]; (c) Schematic diagram of the principle of morphological change of a hierarchical stamp^[37]

Fig. 4. (a) Schematic layout of the integrated tunable laser cavity design^[42]; (b) Wavelength tuning behavior of the widely tunable laser^[42]; (c) Schematic layout of the III-V-on-Si laser^[43]; (d) Wavelength tuning behavior of the III-V-on-Si laser^[43]

Fig. 5. (a) Micrographs of the transfer-printed waveguide photodetector^[44]; (b) Dark current changes before and after transfer^[44]; (c) Illustration of the p-i-n photodiode on top of a SiN waveguide^[45]; (d) Responsivity and quantum efficiency of device at 800 nm and 775 nm wavelengths^[45]

Fig. 6. (a) Schematic image of the micro-transfer printed thin film lithium niobate ring modulator^[46]; (b) Optical transmission at various applied voltages^[46]; (c) Optical transmission of MZI before and after transferring BTO layer^[49]; (d) Phase change at different voltages^[49]; (e) Schematic of the tri-layer adiabatic transition ^[50]; (f) Eye diagrams for 112 GBd NRZ and 180 GBd NRZ^[50]