Near-Field Fano-Imaging of TE and TM Modes in Silicon Microrings
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- 作者：Federico La China ; Francesca Intonti ; Niccol貌 Caselli ; Francesco Lotti ; Francesco Sarti ; Anna Vinattieri ; Adrien Noury ; Xavier Le Roux ; Weiwei Zhang ; Eric Cassan ; Carlos Alonso Ramos ; Elena Dur谩n Valdeiglesias ; Nicolas Izard ; Laurent Vivien ; Massimo Gurioli
- 刊名：ACS Photonics
- 出版年：2015
- 出版时间：December 16, 2015
- 年：2015
- 卷：2
- 期：12
- 页码：1712-1718
- 全文大小：595K
- ISSN：2330-4022
文摘
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.