Abstract
Three types of indirect phase tuning-based plasmonic structures with subwavelength circular grooves/slits and/or central apertures corrugated on Au film supported by glass substrate: depth modulation, width modulation, and hybrid depth-width modulation, were put forth in this paper. They were investigated experimentally by means of nanofabrication and near-filed scanning optical microscope characterization. The plasmonic structures were fabricated using the technique of focused ion beam direct milling. Our experimental results demonstrated that all of the phase tuning-based structures have focusing functions. Both the width and depth modulation-based structures can realize beam focusing and produce an elongated depth of focus. Moreover, after comparison among these three structures, we found that the width modulation-based structure has the best focusing performance.
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Acknowledgements
The research work was supported by ‘111’ project from the State Administration of Foreign Experts Affairs and the Ministry of Education of China (B07014), National High Technology Research and Development Program of China (863 Program-No.2009AA044305, 2009AA044204), National Natural Science Foundation of China (No.50905126, 90923038 & 50935001, 60877021, and 61077010), and Natural Science Foundation of Tianjin.
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Liu, Y., Fu, Y., Zhou, X. et al. Experimental Study of Indirect Phase Tuning-Based Plasmonic Structures for Finely Focusing. Plasmonics 6, 227–233 (2011). https://doi.org/10.1007/s11468-010-9192-1
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DOI: https://doi.org/10.1007/s11468-010-9192-1