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We present a three-dimensional carpet cloak composed of a 350-nm rod-spacing woodpile photonic crystal with tailored local volume filling fraction. Microscope images under monochromatic illumination reveal excellent cloaking at 700 nm wavelength.
Using a novel photoresist (composed of pentaerythritol triacrylate and isopropyl thioxanthone) that favors stimulated emission depletion by a π‐π* transition and using a two‐color two‐photon excitation scheme, 65‐nm wide lines are achieved. This value is limited by parasitic two‐photon absorption of the continuous‐wave depletion beam. It is estimated that, without this process, line widths of 30 nm...
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