高扫描速度和低功耗在实现高性能芯片光学相控阵(OPAs)中变得越来越重要。Nanophotonics新刊封面文章成功地展示了基于薄膜铌酸锂-绝缘体(LNOI)平台的多波导通道集成光学相控阵。基于铌酸锂材料的电光效应，单个移相器的最低功耗为1.11nJ/π，响应时间为14.44ns，功耗低扫描速度高，展现了铌酸锂平台相对其他平台的显著优势。实验上研制出32和48通道铌酸锂薄膜光学相控阵，是目前最大规模基于铌酸锂材料相控阵器件，实现了62.2°×8.8°的二维扫描视场，扫描光束最小发散角为0.33°。这项工作验证了光学相控阵芯片在薄膜铌酸锂平台的进一步规模的扩大以及性能提升的可行性，有望应用于未来的实际场景中。
Fast scanning speed and low-power consumption are becoming progressively more and more important in realizing high-performance chiplet optical phased arrays (OPAs). Here, we successfully demonstrated integrated OPAs with multiple waveguides channels based on thin-film lithium niobate-on-insulator (LNOI) platform. Specifically, two lithium niobate (LN) OPA chips have been implemented with 32 and 48 channels LN waveguides, respectively, enabled by electro-optic modulations, which showcases the low power consumption (1.11 nJ/π) and fast operation speed (14.4 ns), showing obvious advantage of the LNOI platform over others. As results, we experimentally achieved a beam steering with a 62.2° × 8.8° field of view (FOV) and a beam divergence of 2.4° × 1.2° for 32 channels, and a FOV of 40° × 8.8° and a beam divergence of 0.33° × 1.8° for 48 channels. This work also demonstrates the feasibility of LNOI platform in scalable OPA chips.
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