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Trapped rainbow techniques for spectroscopy on a chip and fluorescence enhancement


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.

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V. Smolyaninova acknowledges support of this research by the NSF grants DMR-0348939 and DMR-1104676; V. Shalaev and A. Kildishev acknowledge support by ARO-MURI award 50342-PH-MUR.

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Correspondence to V. N. Smolyaninova.

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Smolyaninova, V.N., Smolyaninov, I.I., Kildishev, A.V. et al. Trapped rainbow techniques for spectroscopy on a chip and fluorescence enhancement. Appl. Phys. B 106, 577–581 (2012).

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  • Fluorescence Enhancement
  • Microlens Array
  • Waveguide Array
  • Optical Signal Processing
  • Lens Radius