CUED Publications database

THz nanoscopy of plasmonic resonances with a quantum cascade laser

Degl'Innocenti, R and wallis, R and wei, B and Xiao, L and Kindness, S and Mitrofanov, O and Braeuninger-Weimer, P and Hofmann, S and Beere, H and Ritchie, D THz nanoscopy of plasmonic resonances with a quantum cascade laser. ACS Photonics. (Unpublished)

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We present a THz scattering near field optical microscope (s-SNOM) based on a quantum cascade laser implemented both as source and detector in a self-mixing scheme utilizing resonant quartz tuning forks as a sensitive nano-positioning element. The home-made s-SNOM, based on a resonant tuning fork and metallic tip, operates in tapping mode with a spatial resolution of ~78 nm. The quantum cascade laser is realized from a bound-to-continuum active region design with a central emission of ~2.85 THz, which has been lens-coupled in order to maximize the feedback into the laser cavity. Accordingly, the spatial resolution corresponds to >/1000. The s-SNOM has been used to investigate a bi-dimensional plasmonic photonic crystal and to observe the plasmonic resonances supported by coupled plasmonic planar antennas, showing remarkable agreement with the theoretical predictions. The compactness, unique sensitivity and fast acquisition capability of this approach makes the proposed s-SNOM a unique tool for solid-state investigations and biomedical imaging

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Div B > Photonics
Depositing User: Cron Job
Date Deposited: 31 Aug 2017 01:18
Last Modified: 21 Sep 2017 01:36