Ultrafast Laser Writing of Photonic Microdevices and Invisible Circuits (IMAGE)
Caption
a, the ultrafast laser writing setup. b, microscope images of the top view of a laser-written waveguide (the horizontal line) in ZnSe crystal, seen through different colours. The waveguide becomes practically invisible in the red part of the spectrum (around 625 nm). c, d, e, the light information is guided through a curved waveguide with a radius of curvature of 363 μm. Three-dimensional waveguides with submillimeter bends were not achieved before this work. The images are part of a video available in the Supplementary materials of the article published in Light: Science & Applications. The curved waveguide laser-written in GeS4 glass (d, microscope image of the top view) is schematized in (e) where a part of the green light from an optical fiber enters in the waveguide. The output of the light can be seen on the camera system (c). The bright spot on the right shows the strong guidance of the curved waveguide.
Credit
Jerome Lapointe, Jean-Philippe Bérubé, Yannick Ledemi, Albert Dupont, Vincent Fortin, Younes Messaddeq, and Réal Vallée
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