Article

Applied Physics B

, Volume 106, Issue 3, pp 577-581

Trapped rainbow techniques for spectroscopy on a chip and fluorescence enhancement

  • V. N. SmolyaninovaAffiliated withDepartment of Physics Astronomy and Geosciences, Towson University Email author 
  • , I. I. SmolyaninovAffiliated withDepartment of Electrical and Computer Engineering, University of Maryland
  • , A. V. KildishevAffiliated withBirck Nanotechnology Centre, School of Electrical and Computer Engineering, Purdue University
  • , V. M. ShalaevAffiliated withBirck Nanotechnology Centre, School of Electrical and Computer Engineering, Purdue University

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Abstract

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.