Near-Field Fano-Imaging of TE and TM Modes in Silicon Microrings

作者：La China Federico^*; Intonti Francesca; Caselli Niccolo; Lotti Francesco; Sarti Francesco; Vinattieri Anna; Noury Adrien; Le Roux Xavier; Zhang Weiwei; Cassan Eric; Ramos Carlos Alonso; Valdeiglesias Elena Duran; Izard Nicolas; Vivien Laurent; Gurioli Massimo

来源：ACS Photonics, 2015, 2(12): 1712-1718.

DOI：10.1021/acsphotonics.5b00327

• silicon microrings
• near-field optics
• resonant scattering
• Fano resonances

A deep-subwavelength imaging of the optical-guided modes localized in silicon microring resonators, obtained with a polarization-sensitive Fano-imaging technique, is demonstrated. We merge together near-field scanning optical microscopy and resonant forward scattering spectroscopy, leading to near-field hyperspectral imaging without the need of embedded light emitters or evanescent light coupling into the microring. The combined analysis of the observed Fano-like spectral line shapes and of the near-field intensity spatial distributions, supported by accurate numerical calculations, gives a clear discrimination between the TE and the TM modes.

• 出版日期2015-12