Reactive Ion Etching on (Yb,Nb):RbTiOPO₄/RbTiOPO₄ epitaxial layers for the fabrication of Y-splitters and Mach-Zehnder Interferometers

Abstract

Rubidium titanyl phosphate RbTiOPO₄ (RTP) belongs to a highly diverse and versatile structural family and because of its large non-linear optical coefficients, wide transparency, high laser damage threshold, high chemical stability and low dielectric constants, this material is highly attractive for electro-optic applications such as modulators and Q-switches. RTP has a similar non-linear optical coefficient to KTP but, unlike KTP, it can be doped with Yb³⁺ ions to obtain a high enough concentration to allow efficient laser action. Because of all these interesting properties, RTP is a strong candidate as a platform material for integrated photonics. Reactive ion etching (RIE) is a commonly used method in etching of semiconductors, but there is little literature available on the plasma-based etching of RTP. Moreover, single-mode rib waveguides have been successfully fabricated in (Yb,Nb):RTP by RIE. In this work, (Yb,Nb):RbTiOPO₄/RbTiOPO₄ (001) epitaxial layers have been structured by RIE by using a combination of Ar and SF₆ gases. The refractive index contrasts between the (Yb,Nb):RbTiOPO4 layer and the RbTiOPO₄ substrate at 1.55 microns have been measured.

More information

Identifiers

ORCID for G.S. Murugan: orcid.org/0000-0002-2733-3273

ORCID for D.P. Shepherd: orcid.org/0000-0002-4561-8184

ORCID for J.S. Wilkinson: orcid.org/0000-0003-4712-1697

Catalogue record

Export record