High-index overlay for high reflectance DBR gratings in LiNbO3 channel waveguides

A thin overlay of high refractive index material is used to obtain high reflectance DBR waveguides in lithium niobate. Silicon, deposited by e-beam evaporation, is found to be a suitable material for this purpose because of its high refractive index, transparency to 1.3- and 1.5-μm wavelengths, opac...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 9; no. 5; pp. 636 - 638
Main Authors Hussell, C.P., Ramaswamy, R.V.
Format Journal Article
LanguageEnglish
Published IEEE 01.05.1997
Subjects
Distributed Bragg reflectors
Etching
Gratings
Insulation
Lithium niobate
Reflection
Reflectivity
Refractive index
Silicon
Waveguide theory
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Summary:A thin overlay of high refractive index material is used to obtain high reflectance DBR waveguides in lithium niobate. Silicon, deposited by e-beam evaporation, is found to be a suitable material for this purpose because of its high refractive index, transparency to 1.3- and 1.5-μm wavelengths, opacity to the visible spectrum, and ease of etching. Experimental results match the theory extremely well and, to the best of our knowledge, exhibit the highest reflection per unit length from a lithium niobate corrugated waveguide reported to date on on insulator technology, waveguide filters.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.588170