Titanium dioxide-assisted metal focusing grating couplers for thin-film lithium niobate waveguides.

IF 3.1 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-04-01 DOI:10.1364/OL.555001

Jungwoo Lee, Min-Suk Kwon

引用次数: 0

Abstract

Thin-film lithium niobate (TFLN)-based photonic integrated circuits (PICs) demand efficient, compact, and simply realizable grating couplers for optimal performance. This work introduces titanium dioxide (TiO₂)-assisted metal focusing grating couplers (TMFGCs) as a promising solution. The TMFGCs leverage a simplified fabrication process based on metal gratings. Moreover, they achieve a smaller footprint compared to previous one-dimensional metal grating couplers (GCs). Theoretical simulations predict a 1.3 dB enhancement in coupling efficiency (CE) due to the integrated TiO₂ structure. Experimental results demonstrate a maximum coupling efficiency of -4.88 dB, with the potential to reach -4.07 dB through refined fabrication techniques. The TMFGCs offer a simple yet effective approach to efficient light coupling in TFLN-based PICs.

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薄膜铌酸锂波导用二氧化钛辅助金属聚焦光栅耦合器。

基于铌酸锂薄膜（TFLN）的光子集成电路（PIC）需要高效、紧凑、易于实现的光栅耦合器，以获得最佳性能。这项研究引入了二氧化钛（TiO2）辅助金属聚焦光栅耦合器（TMFGC），作为一种前景广阔的解决方案。TMFGCs 利用基于金属光栅的简化制造工艺。此外，与以前的一维金属光栅耦合器（GC）相比，它们的占地面积更小。理论模拟预测，由于集成了 TiO2 结构，耦合效率（CE）可提高 1.3 dB。实验结果表明，最大耦合效率为 -4.88 dB，通过改进制造技术，有可能达到 -4.07 dB。TMFGC 为在基于 TFLN 的 PIC 中实现高效光耦合提供了一种简单而有效的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.