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Self-imaging effects in curved gradient index multimode interference structures made by K+-Na+ ion exchange

Błahut M., Froniewski D.

Optica Applicata

2009

Vol. 39, nr 3

445-458

The paper presents an analysis of self-imaging phenomena in gradient multimode interference (MMI) structures produced by K+-Na+ ion exchange in glass. This investigation concerned curved MMI structures with various geometries - for the linear, concave function described by an exponential function, and the convex structure connected with a cosine course. The relations derived characterizing the relative shortening of the length of propagation for N-fold images have been confirmed by numerical simulations using the beam propagation method (BPM) of symmetrically excited gradient splitters 1×2.

Investigations of multimode interference structures made by ion exchange in glass

Błahut M., Kasprzak D.

Optica Applicata

2003

Vol. 33, nr 4

613-626

Experimental results obtained by the visualization method of modal interference in gradient-index multimode interference structures made by Ag+-Na+ and K+-Na+ ion exchange process in glass are presented. The investigation concerns the self-imaging phenomena for symmetrical and paired interference for TE, TM and unpolarized light excitation. A comparison between experimental results obtained and beam propagation method (BPM) simulations is also presented.