This PDF file includes:

• section S1. Synthesis procedure and luminescence properties of the model compounds
• section S2. Structural characterizations and lasing measurements of the isolated OPV-A and OPV-B NWs
• section S3. Construction of the axially coupled heterogeneous NW resonators with effective mode modulation
• section S4. Numerical simulation of the effective refractivity and threshold gain
• fig. S1. The synthetic route of compound OPV-A.
• fig. S2. The synthetic route of compound OPV-B.
• fig. S3. Normalized fluorescence spectra of the OPV-A and OPV-B powders.
• fig. S4. Absolute fluorescence quantum yields (Φ) of OPV-A and OPV-B powders.
• fig. S5. XRD patterns of OPV-A and OPV-B NWs and powder samples.
• fig. S6. Optical waveguiding properties of OPV-A and OPV-B NWs.
• fig. S7. Schematic illustration of the homebuilt setup for optical characterization.
• fig. S8. Microcavity effects of uncoupled NWs.
• fig. S9. Schematic diagram of the fabrication process of the axially coupled heterogeneous NWs.
• fig. S10. Controllable fabrication of the axially coupled heterogeneous NW cavities.
• fig. S11. Three-dimensional numerical simulation of the output field from the NW end facet.
• fig. S12. Influence of gap distance on the mode modulation.
• fig. S13. Schematic diagram of the construction strategy of the desired gap distance for axially coupled heterogeneous NW resonators.
• fig. S14. Coupling effect of axially coupled heterogeneous NW cavities.
• fig. S15. Evolution of the emission spectra with the increase of pump power for isolated and heterogeneously coupled NWs.
• fig. S16. Lasing characterization of the OPV-B NW coupled with OPV-A NWs of different lengths.
• fig. S17. Lasing characterization of the axially coupled heterogeneous NWs with varying gap distances.
• fig. S18. Theory model.
• References (54–58)

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