Abstract

We report for the first time to our knowledge optical waveguiding in an organic crystalline waveguide produced by ion implantation. Using H+ ions a refractive index barrier suitable for waveguiding has been realized in the highly nonlinear optical organic crystal 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST). The refractive index changes in the waveguiding region as a function of the distance from the surface have been measured. Maximal refractive index changes of up to -0.2 and -0.1 at wavelengths of 633nm and 810nm have been realized, respectively. The waveguide refractive index profiles as a function of the ion fluence have been determined. Planar waveguiding has been demonstrated by polishing sharp edges and using conventional end-fire coupling. The measured losses are approximately 7 dB/cm at 1.57mum.

Highlights

  • Organic electro-optic materials combine very fast nonlinearities with low dielectric constants which result in larger optical bandwidths of over 100 GHz compared to standard inorganic materials used in telecommunication[1]

  • We present the fabrication of planar optical waveguides in an organic crystal by ion implantation

  • We show that the process of H+ and He+ ion implantation in organic crystals is essentially different from the phenomenon in inorganic crystals or polymers

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Summary

Introduction

Organic electro-optic materials combine very fast nonlinearities with low dielectric constants which result in larger optical bandwidths of over 100 GHz compared to standard inorganic materials used in telecommunication[1]. DAST (4-N, N-dimethylamino-4’-N’-methyl stilbazolium tosylate) is a widely investigated organic crystal with large electro-optic coefficients r11 = 77 ± 8 pm/V at 800 nm and r11 = 47 ± 8 pm/V at 1535 nm combined with a low dielectric constant (ε 1 = 5.2)[2, 3]. It is an interesting candidate for high speed applications in telecommunications provided that optical waveguiding is achievable. We present measurements of the refractive index profile and waveguide modes, and demonstrate planar waveguiding by end-fire coupling

Ion implantation experiments
Model of ion implantation
Reflection scan measurement method
Barrier coupling method
Results
Waveguiding experiments
Conclusions

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