Experimental demonstration of the optical Helmholtz resonance

Paul Chevalier (1, 2) , Patrick Bouchon (1) , Michael Verdun (1, 2) , Emilie Steveler (2) , Nathalie Bardou (2) , Christophe Dupuis (2) , Fabrice Pardo (2) , Riad Haidar (1, 3)

1 DOTA, ONERA, Université Paris Saclay (COmUE) [Palaiseau]
2 C2N - Centre de Nanosciences et de Nanotechnologies [Orsay]
3 X - École polytechnique

Optical nanoantennas are studied to manipulate light and enhance light matter interactions. Here, we experimentally demonstrate the optical Helmholtz resonance in a metallic slit-box structure, which is predicted to be harmonic and to enhance the electric field intensity by several orders of magnitude. It is fabricated thanks to a two step electron beam lithography process, between which the box was filled with benzocyclobutene (BCB). Up to 80% of the light is absorbed at a λ = 2.84 μm wavelength under a beam focused by a Cassegrain objective (NA = 0.4), even if the dimensions of this resonator are deeply subwavelength for both the slit (width λ/55 and height λ/77) and the box (width λ/7 and height λ/37). As expected from the inductance nature of the box, the optical properties of the BCB filling the box have no influence on the resonance behavior.

Mots clés: RESONATEUR OPTIQUE; RESONATEUR HELMHOLTZ; NANOPHOTONIQUE; RESONATEUR OPTIQUE

Domaines: Optique / photonique

Paul Chevalier, Patrick Bouchon, Michael Verdun, Emilie Steveler, Nathalie Bardou, et al.. Experimental demonstration of the optical Helmholtz resonance. Applied Physics Letters, 2018, 112 (17), pp.171110-1 - 171110-4. ⟨10.1063/1.5028256⟩. ⟨hal-01853314⟩