Channel waveguides and Mach-Zehnder structures on RbTiOPO4 by Cs+ ion exchange

Identificador:  imarina:9241969

Handle: https://hdl.handle.net/20.500.11797/imarina9241969

Autors:  Butt, M A; Pujol, M C; Sole, R; Rodenas, A; Lifante, G; Wilkinson, J S; Aguilo, M; Diaz, F

Resum:
Cs+ ion exchange in RbTiOPO4 and (Yb,Nb): RTP/RTP(001) has been used to locally increase the refractive indices for waveguide circuit fabrication. Ti masks were fabricated on RTP samples by conventional photolithography. Cs+ exchange was done using a CsNO3 melt at 698 K during 2 h. Elemental analysis confirms an Cs+ profile with a variable depth. Apparently the Cs+ exchange is disfavored in the doped epitaxial sample. The refractive index variation is higher for n(z) than for n(x,y). Near-field images of the guided modes at 633, 1064 and 1520 nm were recorded. The optical characterization shows propagation losses of 5 dB/cm at 1520 nm. (C) 2015 Optical Society of America