Visible light red, green, and blue multiplexer by sputter-deposited thin-film lithium niobate

Atsushi Shimura; Jiro Yoshinari; Hiroki Hara; Hiroshi Take; Tetsuya Mino; Shigeru Mieda; Takashi Kikukawa; Katsumi Kawasaki; Yasuhiro Takagi; Hideaki Fukuzawa

doi:10.1117/1.APN.4.5.056001

Advanced Photonics Nexus, Volume. 4, Issue 5, 056001(2025)

Visible light red, green, and blue multiplexer by sputter-deposited thin-film lithium niobate

Atsushi Shimura^*, Jiro Yoshinari, Hiroki Hara, Hiroshi Take, Tetsuya Mino, Shigeru Mieda, Takashi Kikukawa, Katsumi Kawasaki, Yasuhiro Takagi, and Hideaki Fukuzawa

Author Affiliations

TDK Corporation, Advanced Products Development Center, Technology and Intellectual Property HQ, Ichikawa-city, Japan

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Fig. 1. Schematic of the sputter-deposited TFLN RGB multiplexer: (a) top view image and (b) cross-sectional image.

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Fig. 2. Color map indicating the intensity distribution of the propagation mode through the RGB multiplexer: (a) green, (b) blue, and (c) red.

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Fig. 3. Simulation results for the multiplexer loss: (a) $L_{1}$ dependence and (b) $L_{2}$ dependence.

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Fig. 4. Schematic of the RGB multiplexer measurement system.

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Fig. 5. Schematic of the RGB multiplexer sample: (a)–(c) cross-sectional SEM images of a TFLN waveguide.

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Fig. 6. Experimental images of the propagation of the red, green, and blue monochromatic laser lights through the RGB multiplexer.

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Fig. 7. Experimental images of propagation of the combined laser lights through the RGB multiplexer: (a) magenta, (b) yellow, (c) cyan, and (d) white.

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Fig. 8. Chromaticity diagram generated by the red, green, and blue laser lights propagating through the RGB multiplexer.

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Table 1. Parameters used to design the sputter-deposited TFLN RGB multiplexer.
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Table 1. Parameters used to design the sputter-deposited TFLN RGB multiplexer.
$T_{LN}$ ( $μ m$ ) $W_{top}$ ( $μ m$ ) $W_{bottom}$ ( $μ m$ ) $T_{slab}$ ( $μ m$ ) $W_{1}$ ( $μ m$ ) $W_{Arm}$ ( $μ m$ ) $W_{Gap}$ ( $μ m$ ) $L_{1}$ ( $μ m$ ) $L_{2}$ ( $μ m$ )
0.7 2.0 2.2 0.1 6.5 2.0 1.5 620 1680

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Atsushi Shimura, Jiro Yoshinari, Hiroki Hara, Hiroshi Take, Tetsuya Mino, Shigeru Mieda, Takashi Kikukawa, Katsumi Kawasaki, Yasuhiro Takagi, Hideaki Fukuzawa, "Visible light red, green, and blue multiplexer by sputter-deposited thin-film lithium niobate," Adv. Photon. Nexus 4, 056001 (2025)

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