Science Advances

Supplementary Materials

This PDF file includes:

  • section S1. Schematic of spasers
  • section S2. Imaging principle
  • section S3. Optical setup
  • section S4. Calibration in momentum space
  • section S5. Lasing spectra and emission patterns at varied pump powers
  • section S6. Interference in the momentum space image
  • section S7. Interference in the spatial space image
  • section S8. Surface plasmon generation efficiency
  • section S9. Preferentially scattering polarization
  • section S10. Peak value of η at a diameter of around 210 nm
  • section S11. Transverse modes supported by nanowire spaser cavity
  • section S12. Momentum space image of a nanowire spaser
  • fig. S1. Schematics of spaser configurations studied in this work.
  • fig. S2. Schematics of imaging principles.
  • fig. S3. Schematic of leakage radiation microscopy setup.
  • fig. S4. Calibration in the momentum spaces.
  • fig. S5. Spectrum and spatial emission patterns of the spaser shown in Fig. 2 under different pump powers.
  • fig. S6. Interference of scattered photon emission in the momentum spaces.
  • fig. S7. Interference in the spatial space image.
  • fig. S8. Calculation of surface plasmon generation efficiency.
  • fig. S9. Effective index for the calculation of the Ez/Ex ratio of a surface plasmon cavity mode.
  • fig. S10. The proportion in surface plasmon mode with HSP1 mode versus nanowire diameter.
  • fig. S11. Four transverse modes supported by a nanowire cavity with a diameter of 212 nm on the Ag film in the two- and three-dimensional simulation.
  • fig. S12. Spatial, momentum, and frequency space images of a nanowire spaser.

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