铌酸锂
材料科学
栅栏
光学
薄膜
光电子学
折射率
铌酸钾
衍射光栅
基质(水族馆)
切趾
衍射效率
铁电性
纳米技术
电介质
地质学
物理
海洋学
作者
Jing Huang,Nuo Chen,Kaizhong Chen,Tao Chu
出处
期刊:Optics Letters
[The Optical Society]
日期:2024-01-01
卷期号:49 (2): 222-222
被引量:2
摘要
We demonstrated a low-loss O-band grating coupler on an x-cut thin-film lithium niobate substrate by implementing subwavelength and apodized structures. The subwavelength gratings were used to mitigate the refractive index discontinuity between the input taper and grating region, which was the first application of such a structure for grating coupler optimization on a thin-film lithium niobate substrate. The coupling efficiency was measured to be −1.99 dB/coupler at a wavelength of 1312.8 nm, which was the lowest loss among the reported lithium niobate grating couplers that do not use metal mirrors. The proposed design does not require metal mirrors or any additional material layers and can be easily fabricated with a single-step lithography and etching processes.
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