17 September 2018 A new technique for producing low-loss BSO waveguides (Conference Presentation)
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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).
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Florent Behague, Florent Bassignot, Ludovic Gauthier-Manuel, Venancio Calero Vila, Fadi Baida, Maria-Pilar Bernal-Artajona, and Nadege Courjal "A new technique for producing low-loss BSO waveguides (Conference Presentation)", Proc. SPIE 10720, Nanophotonic Materials XV, 107200T (17 September 2018); doi: 10.1117/12.2500206; https://doi.org/10.1117/12.2500206


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