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Proceedings Paper

A new technique for producing low-loss BSO waveguides (Conference Presentation)
Author(s): Florent Behague; Florent Bassignot; Ludovic Gauthier-Manuel; Venancio Calero Vila; Fadi Baida; Maria-Pilar Bernal-Artajona; Nadege Courjal
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Paper Abstract

Isotropic sillenite crystals such as Bismuth Silicon Oxide (BSO) present highly interesting opto-electronics properties including electro-optic effect and photorefractivity. BSO is also a highly suitable candidate for sensitive temperature-independent electric field sensors [1]. Then the production of low cost BSO-based optical-waveguides is becoming a major challenge. However, BSO high density (> 7 g.cm3) and non-standard dimensions are a hurdle for standard fabrication approaches such as ion diffusion or exchange and standard clean-room technologies. Here we report for the first time the successful fabrication of low loss BSO ridge waveguides with high index contrast. The proposed technique is based on optical-grade dicing [2], which allows low cost and massive production of photonic devices in different types of material. Ridge waveguides are made in a 15-µm thick chemical mechanical polished thin layer of BSO bonded on a lithium-niobate wafer. Propagation losses, group velocity and modal birefringence of optical modes have been measured by Optical-Coherence-Tomography. The waveguides support both TE and TM guided modes at telecom wavelength (1.55 µm) and present propagation losses lower than 2 dB/cm. This approach promises to be powerful for shaping single crystal thin films even in exotic formats. We expect low loss optical-waveguide in BSO will pave the way toward compact and highly sensitive electric-field sensors, scintillators, LED and laser applications. [1] I. Saniour et al, NMR in Biomedicine,31, (2018). [2] N. Courjal et al, Journal of Physics D: Applied Physics, 305101,(2011).

Paper Details

Date Published: 17 September 2018
Proc. SPIE 10720, Nanophotonic Materials XV, 107200T (17 September 2018); doi: 10.1117/12.2500206
Show Author Affiliations
Florent Behague, FEMTO-ST (France)
Florent Bassignot, FEMTO-ST (France)
Ludovic Gauthier-Manuel, FEMTO-ST (France)
Venancio Calero Vila, FEMTO-ST (France)
Fadi Baida, FEMTO-ST (France)
Maria-Pilar Bernal-Artajona, FEMTO-ST (France)
Nadege Courjal, FEMTO-ST (France)

Published in SPIE Proceedings Vol. 10720:
Nanophotonic Materials XV
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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