Seminars and Events

Seminars and Events

Photonic Materials

Coordinator: Alvaro Blanco

06 February 2018, 12:00 h. Sala de Seminarios, 182

Near-field photonic mode mapping

Massimo Gurioli
Department of Physics and Astronomy, University of Florence, Italy

The tremendous progress in nanophotonics towards efficient quantum emitters at the nanoscale requires investigation tools able to access the detailed features of the electromagnetic field with deep-subwavelength spatial resolution. This scenario has motivated the development of different nanoscale photonic imaging techniques.
In this contribution, we will overview our activity in exploiting near-field microscopy for optical characterization of photonics nanoresonators, showing that the scanning near-field optical microscopy (SNOM) is a powerful method to image the electric-magnetic fields in nanophotonics.
We will discuss a novel technique involving the combination of scanning near-field optical microscopy with resonant scattering spectroscopy, leading to Fano profiles signal for the optical modes [1]. By exploiting both tip perturbation and collection, either in forward or in backward geometry, our approach enables the imaging of the electric and magnetic field intensity (including phase, amplitude and polarization) in nano-resonators with sub-wavelength spatial resolution (Lambda/20) [1-4]. We will discuss results both in photonic crystals [1-4] and in disordered modes [5-8]. We conclude with recent results on the exploitation of our resonant scattering SNOM for addressing the exceptional points in photonics [9].

[1] N. Caselli, et al. Light: Science & Applications 4, e326 (2015)
[2] N. Caselli, et al. Scientific Reports 5, 9606 (2015)
[3] F. La China, et al. Appl. Phys. Lett. 107, 101110 (2015)
[4] F. La China, et al. ACS Photonics 2, 1712 (2015)
[5] F. Riboli, et al. Nat. Materials 13: 720 (2014)
[7] N. Caselli, et al. APL Photonics 1, 041301 (2016)
[8] N. Caselli, et al. APL 110, 081102 (2017)
[9] N. Caselli, et al. Nat. Comm. in press (2018)


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