22 February 2018 Subwavelength imaging and control of ultrafast optical near field in nanosized bowtie and ring
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Subwavelength imaging and control of localized near-field distribution under off-resonant excitation within identical gold bowtie structure, and of dark mode distribution within nanoring were demonstrated. The near-field control was established by coherent control of two orthogonally polarized fs laser pulses in bowtie and by varying polarization direction and wavelength of single femtosecond laser beam in the nanoring structure. We found that the hot spot under off-resonant wavelength illumination mainly distributed along the edges of the nanoprism in the bowtie and quadruple mode formation in the nanoring. The obtained results show that the PEEM images correspond generally to the simulated patterns of the plasmonic modes for the both structures and difference exists between experimental and simulated images. The responsible reasons for difference are discussed in terms of band structure near Fermi level and of surface imperfects of the structure. Our finding for the near field control of the nanostructure provides a fundamental understanding of the non-radiative optical near field and will pave the ways for the applications such as sensing, SERS, biomedicine and plasmonic devices.
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Xiaowei Song, Xiaowei Song, Boyu Ji, Boyu Ji, Peng Lang, Peng Lang, Jingquan Lin, Jingquan Lin, } "Subwavelength imaging and control of ultrafast optical near field in nanosized bowtie and ring", Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 1053018 (22 February 2018); doi: 10.1117/12.2287134; https://doi.org/10.1117/12.2287134

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