Abstract
A self-written waveguide can dynamically evolve in response to illumination in a photosensitive material.1 We recently reported self-written taper structures created in bulk chalcogenide glass,2 and waveguides have been written in bulk pho- toρolymers.3,4, Although in all these materials illumination increases the refractive index, some materials can exhibit a decrease (for example Ge- doped silica films5) and we recently observed such a decrease in bulk Nd-doped Bk7 glass. Negative index changes allow a new range of wave- E(x,y,t) is the electric field amplitude, and x and y are the transverse coordinates. The beam width at the input face is a, corresponding to a peak-to-peak (PTP) value of the intensity distribution of a 's/2m. In practice a “donut” shaped writing beam can be produced by several different techniques.8
© 2002 Optical Society of America
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