Multi-dielectric stacks as a platform for giant optical field

International audienceMulti-dielectric thin films are usually studied as waveguiding structures with low absorption effectbecause of the low imaginary part of the refractive index. However, when properly designed, wedemonstrated that multi-dielectric stacks can sustain large optical fields. We briefly present hereour design method leading the fabrication of such multi-dielectric stacks, which can be optimizedfor arbitrary wavelengths, indices or polarizations. We then report on our experimental character-ization in near and far field, using a photon scanning tunneling microscope and scattering opticalsetup, respectively. This investigation may find applications for ultra-sensitive optical sensors orintegrated light sources to mention a few