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Experimental demonstration of the optical Helmholtz resonance

Abstract : 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.
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Submitted on : Friday, August 3, 2018 - 9:33:59 AM
Last modification on : Tuesday, March 16, 2021 - 3:42:15 PM
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Paul Chevalier, Patrick Bouchon, Michael Verdun, Emilie Steveler, Nathalie Bardou, et al.. Experimental demonstration of the optical Helmholtz resonance. Applied Physics Letters, American Institute of Physics, 2018, 112 (17), pp.171110-1 - 171110-4. ⟨10.1063/1.5028256⟩. ⟨hal-01853314⟩

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