Fig. 1. CR chip^[8]. (a) Schematic and SEM image of integrated free-electron radiation chip; measured (b) radiation power and (c) radiation spectra of radiation chip

Fig. 2. Threshold-less CR in hBN^[12]. (a) Low-energy free-electron flying on top of hBN layer for CR generation; (b) simulated results of infrared CR in hBN for different free-electron energies; (c) simulated results of CR in hBN under different frequencies for electron energy of only 1eV

Fig. 3. Interaction between free-electrons and nano-slot grating for radiation generation^[9]. (a) Schematic of interaction between free-electrons and grating; (b) SEM images of nano-slot grating; (c) experimental test system; (d) experimental test results of SPR

Fig. 4. Test results of cascaded nano-slot grating SPR^[9]. (a) SEM image of cascaded nano-slot grating; (b) output radiation results from experimental measurement

Fig. 5. Theoretical investigation of stimulated Cherenkov radiation based on SPP micro-cavity^[10]. (a) Structural diagram; (b) simulated results; (c) dispersion relation of SPP mode and evanescent wave surrounding electron beam; (d) emission wavelengths under different electron energies

Fig. 6. Spectral imaging chip and single micro-spectrometer^[13]. (a)Spectral imaging chip including integrated several micro-spectrometers; (b) metasurface structure for a micro-spectrometer

Fig. 7. Snapshot spectral imaging^[13]. (a) Schematic of snapshot spectral imaging; (b) shooting target for spectral imaging; (c) demonstration of spectral data

Fig. 8. Nanobeam micro-cavity based on hetero opto-mechanical crystals^[14]. (a) Plan-view schematic of opto-mechanical crystal micro-cavity; (b) optical energy band in periodic region; (c) frequency variation of X point of dielectric bands with unit cell size; (d) mechanical energy band in periodic region; (e) frequency variation of lowest point of breathing-mode bands with unit cell size

Fig. 9. Waveguide-coupled nanobeam micro-cavity based on opto-mechanical crystals^[15]. (a) Pseudo-colored side-view of micro-cavity; (b) top-view SEM image of micro-cavity

Fig. 10. Refractive index sensing chip based on opto-mechanical crystals^[17]. (a) Variation of refractive index near micro-cavity induced by nano-particles; (b) refractive index sensing mechanisms under different mechanical Q values; (c) refractive index variation and corresponding detuning versus frequency shift

Fig. 11. Integrated OAM emitter based on SOI^[20]. (a) Structural diagram; (b) picture of prepared sample; (c) amplified picture of “cobweb” grating

Fig. 12. Dynamic characteristics of integrated OAM emitter^[20]. (a) Results of simulation and experiment for left-hand circular polarization (LHCP); (b) results of simulation and experiment for right-hand circular polarization (RHCP); (c) switching power versus topological charge

Fig. 13. Interference patterns of radiation mode from OAM emitter with 32 download waveguides

Fig. 14. Schematic of vortex SPR generation and simulated results^[21]. (a) SPR generation via interaction between periodic-grouping free electrons with holographic grating; (b) simulated results of vortex SPR with different topological charges

Fig. 15. Compound angular momentum beam splitter with phase modulation^[22]. (a) Picture of sample; (b) experimental result of beam splitting

Fig. 16. Correlated photon pair generation in silicon micro-ring resonator^[24]. (a) Schematic of silicon micro-ring resonator; (b) photon pair generation rate in silicon micro-ring resonator versus pump power

Fig. 17. Realization of crucial functions of silicon quantum photonic chip^[29]. (a) Schematic of silicon quantum photonic chip; (b) SEM image of silicon shallow-ridge waveguide integrated superconducting nanowire single photon detector

Fig. 18. Temporal quantum ghost imaging realized by silicon-waveguide quantum light source^[30]. (a) Schematic of experimental setup; (b) typical experimental result