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Experimental analysis of submicrometer optical intensity distributions after an opaque disk

Abstract : Generation of subwavelength beam sizes is a fascinating challenge with several implications. The observation of a 120 nm laser spot in the visible part of the spectrum is reported here. It has a size variation of less than 10% in a distance of 50 µm along the axis of propagation. This so-called Arago spot results from the diffraction of the light from a laser diode by the edges of an absorbing disk. Applications are discussed and hollow beams carrying orbital angular momentum with a 400 nm diameter dark spot in the center are evidenced. This paves the way toward atom lithography via atom guiding or new spectroscopy on forbidden transitions. © 2020 Optical Society of America.
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O. Emile, Janine Emile. Experimental analysis of submicrometer optical intensity distributions after an opaque disk. Applied optics, Optical Society of America, 2020, 59 (6), pp.1678-1683. ⟨10.1364/AO.387699⟩. ⟨hal-02535642⟩

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