Journal
OPTICS EXPRESS
Volume 28, Issue 19, Pages 27839-27849Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.396667
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Funding
- Stiftelsen for Strategisk Forskning [RMA15-0135]
- Knut och Alice Wallenbergs Stiftelse
- Vetenskapsradet
- Swedish Foundation for Strategic Research (SSF) [RMA15-0135] Funding Source: Swedish Foundation for Strategic Research (SSF)
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Grating couplers on thin-film lithium niobate ridge waveguides were designed and fabricated using UV-laser ablation. The calculated coupling efficiency with a sinusoidal grating can be as large as 53% in a 0.5 mu m thin film. The maximum grating depth we fabricated was 130nm, limiting the coupling efficiency to a theoretical value of 18%. We fabricated grating couplers on adhered ridge waveguides of 20 mu m thickness. Coupling light to waveguides on thin-film lithium niobate is still challenging, and here we present a fast, cheap and reliable fabrication alternative. It will benefit the on-chip testing of integrated components developed on this novel and promising material platform. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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