Trapped rainbow techniques for spectroscopy on a chip and fluorescence enhancement
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- Smolyaninova, V.N., Smolyaninov, I.I., Kildishev, A.V. et al. Appl. Phys. B (2012) 106: 577. doi:10.1007/s00340-011-4856-x
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We report on the experimental demonstration of the broadband “trapped rainbow” in the visible range using arrays of adiabatically tapered optical nanowaveguides. Being a distinct case of the slow light phenomenon, the trapped rainbow effect could be applied to optical signal processing, sensing in such applications as spectroscopy on a chip, and to providing enhanced light-matter interactions. As an example of the latter applications, we have fabricated a large area array of tapered nanowaveguides, which exhibit broadband “trapped rainbow” effect. Considerable fluorescence enhancement due to slow light behavior in the array has been observed.