Fig. 1. Optical properties of semiconductor quantum dot. (a) STEM image of InAs quantum dot^[54]; (b) energy level diagram of quantum dot^[51]; (c) schematic of different exciton states of quantum dot^[55]; (d) fluorescence spectrum of single quantum dot at 4.2 K^[54]

Fig. 2. Magnetic field regulation of semiconductor quantum dot. (a) Magneto-optical spectrum of quantum dot^[76]; (b) hole spin initialization in quantum dot^[77]; (c) weak coupling between quantum dot and microcavity^[78]; (d) strong coupling between quantum dot and microcavity^[79]

Fig. 3. Optical field distribution in nanostructure. (a) Optical field distribution in optical fiber^[37]; (b) optical field distribution in photonic crystal waveguide^[37]

Fig. 4. Chirality in strip waveguide. (a) Unidirectional transport of spin state^[80]; (b) unidirectionality of transmission spectrum of chiral coupled quantum dot^[93]; (c) position-dependent chiral coupling in waveguide^[94]

Fig. 5. Chirality in photonic crystal waveguide. (a) Chirality in W1-type photonic crystal waveguide^[103]; (b) glide-plane waveguide structure^[105]

Fig. 6. Chiral photonic devices. (a) Schematic diagram of chiral transport in cross-waveguides^[106]; (b) spin- and position-dependent chiral coupling in chiral photonic devices^[107]