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Emitter Coupling

How a single-molecule emitter (anthracene/DBT-in-crystal, x-polarized dipole, ~780nm) couples into Si3N4 waveguides. These studies share a common question — "does the crystal-slab mode or a direct near-field overlap carry energy into a nearby guide, and how much?" — across different waveguide geometries and orientations:

  • slab ↔ waveguide — guide terminates short of the emitter, coupling purely via the crystal slab mode
  • parallel vertical waveguides — collection + excitation guides normal to the crystal, testing cross-talk vs. polarization
  • dual-angle waveguide — a straight collection guide plus a 45° tilted pump guide on a cleaved facet
  • vertical slot coupler — coupling into a vertically-oriented slot waveguide's fundamental mode, on a PEC mirror
  • coupling-chip inverse design v2 — two-chip vertical coupler with a free-form inverse-designed coupler
  • crystal transition (supplemental) — supplemental study of the crystal transition region itself
  • facet-mirror coupling (v3) — the Gen 3 geometry: crystal stamped on a cleaved facet, fused against a 50 nm Ag mirror, NA=0.6 top excitation. Collection efficiency 50.5%, excitation efficiency 52.0%, cross-talk 2.6% (idealized upper-bound estimate; see caveats on that page)

Findings here are the emitter-coupling assumptions behind single_molecule_device_v1 and feed the cavity work in Cavity & Purcell Enhancement.