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Plasmonic nano-antennas have proven the outstanding ability of sensingchemical and physical processes down to the nano-meter scale. Sensing isusually achieved within the highly confined optical fields generated resonantlyby the nano-antennas, i.e. in contact to the nano-structures. In these paper,We demonstrate the sensing capability of nano-antennas to their larger scaleenvironment, well beyond their plasmonic confinement volume, leading to theconcept of 'remote' (non contact) sensing on the nano-meter scale. On the basisof a bowtie-aperture nano-antenna (BNA) integrated at the apex of a SNOM fibertip, we introduce an ultra-compact, move-able and background-free opticalnano-sensor for the remote sensing of a silicon surface (up to distance of 300nm). Sensitivity of the BNA to its large scale environment is high enough toexpect the monitoring and control of the spacing between the nano-antenna and asilicon surface with sub-nano-meter accuracy. This work paves the way towards anew class of nano-positionning technique, based on nano-antenna resonancemonitoring, that are alternative to nano-mechanical and opticalinterference-based devices.

Remote optical sensing on the nanometer scale with a bowtie aperture nano-antenna on a SNOM fiber tip