Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy - Redolat, Javier; Arenas Ortega, Daniel; Barreda Gomez, Angela Inmaculada; Griol, Amadeu; Pinilla Cienfuegos, Elena; Martinez, Alejandro (npj Nanophotonics, 2025)