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(a) Experimental geometry of the trapped rainbow experiment: a glass lens was coated on one side with a gold film. The lens was placed with the gold-coated side down on top of a flat glass slide also coated with a gold film. The air gap between these surfaces formed an adiabatically changing optical nano waveguide. (b) Photo of the trapped rainbow experiment: HeNe and Ar:Ion laser light is coupled into the waveguide. (c) Optical microscope image of the trapped rainbow.
Comparison of the optical microscope images of the trapped rainbow effect from Fig. 1(c) (bottom) and the image (top) obtained when only two laser wavelengths (514 and 633 nm) are used for illumination. Individual spectral lines separated by only a few micrometers appear to be well resolved (see Fig. 3).
Cross sections of the optical microscope images along the yellow lines shown in Fig. 2. The zero point of the cross sections starts outside the innermost red ring in Fig. 2. Individual spectral lines are clearly resolved in the bottom plot obtained using 514 and 633 nm illumination. Multiple spectral lines are visible in the top cross section.
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