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Near-field nonlinear imaging of an anapole mode beyond diffraction limit.
- Source :
-
Optics letters [Opt Lett] 2021 May 01; Vol. 46 (9), pp. 2095-2098. - Publication Year :
- 2021
-
Abstract
- Nonlinear nanophotonics, as an emerging field in nanophotonics, eagerly calls for experimental techniques for probing and analyzing near-field nonlinear optical signals with subwavelength resolution. Here, we report an aperture-type scanning near-field optical microscopic method for probing near-field nonlinear optical processes. As a demonstration, near-field third-harmonic generation from an anapole dark-mode state generated by a silicon nanodisk is probed and imaged. The measured results agree well with the simulations, with a spatial resolution down to $0.14{\lambda _0}$ and a sensitivity of 0.1 nW. This method provides a powerful tool for characterizing nonlinear light-matter interactions at the nanoscale, which can help, for example, to unveil crystal properties involving subwavelength defects or dislocations.
Details
- Language :
- English
- ISSN :
- 1539-4794
- Volume :
- 46
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Optics letters
- Publication Type :
- Academic Journal
- Accession number :
- 33929427
- Full Text :
- https://doi.org/10.1364/OL.418664