1.European Laboratory for Nonlinear Spectroscopy, via Nello Carrara 1 50019, Sesto Fiorentino (FI), Italy
2.Department of Physics, University of Florence, via Sansone 1 50019 Sesto Fiorentino (FI), Italy
3.Department of Physics, University of Trento, via Sommarive 14, 38123, Povo (TN), Italy
4.Institute of Photonics and Nanotechnology, CNR, 00156 Roma, Italy
5.Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
6.School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
7.COBRA Research Institute, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
N Caselli, Email: caselli@lens.unifi.it
纸质出版日期:2015-09,
网络出版日期:2015-05-07,
收稿日期:2015-02-19,
修回日期:2015-04-23,
录用日期:2015-05-03
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Ultra-subwavelength phase-sensitive Fano-imaging of localized photonic modes[J]. LSA, 2015,4(3).
Caselli, N. et al. Ultra-subwavelength phase-sensitive Fano-imaging of localized photonic modes. Light: Science & Applications, 4, e326 (2015).
Ultra-subwavelength phase-sensitive Fano-imaging of localized photonic modes[J]. LSA, 2015,4(3). DOI: 10.1038/lsa.2015.99.
Caselli, N. et al. Ultra-subwavelength phase-sensitive Fano-imaging of localized photonic modes. Light: Science & Applications, 4, e326 (2015). DOI: 10.1038/lsa.2015.99.
Photonic and plasmonic devices rely on nanoscale control of the local density of optical states (LDOS) in dielectric and metallic environments. The tremendous progress in designing and tailoring the electric LDOS of nano-resonators requires an investigation tool that is able to access the detailed features of the optical localized resonant modes with deep-subwavelength spatial resolution. This scenario has motivated the development of different nanoscale imaging techniques. Here
we prove that a technique involving the combination of scanning near-field optical microscopy with resonant scattering spectroscopy enables imaging the electric LDOS in nano-resonators with outstanding spatial resolution (λ/19) by means of a pure optical method based on light scattering. Using this technique
we investigate the properties of photonic crystal nanocavities
demonstrating that the resonant modes appear as characteristic Fano line shapes
which arise from interference. Therefore
by monitoring the spatial variation of the Fano line shape
we locally measure the phase modulation of the resonant modes without the need of external heterodyne detection. This novel
deep-subwavelength imaging method allows us to access both the intensity and the phase modulation of localized electric fields. Finally
this technique could be implemented on any type of platform
being particularly appealing for those based on non-optically active material
such as silicon
glass
polymers
or metals.
nanocavitynanophotonicsnear-fieldphase retrievalresonant-scattering
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