. "Bar\u00E1nek, Michal" . . . . . "Bouchal, Zden\u011Bk" . . "[BDCE96BB620E]" . "8" . "103501" . . "We demonstrate both theoretically and experimentally that a spiral mask with a finite number of discrete phase levels allows a defocusing induced rotation of the point spread function in the vortex imaging. Two experimental configurations based on a spiral phase modulation of light and a spiral filtering of the spatial spectrum are studied in a unified theoretical treatment. The rotating point spread functions are analyzed in detail for imaging realized by the vortex lens and the 4-f system used in the spiral phase contrast microscopy. The theoretical results are verified by experiments using a spatial light modulator. The method is applicable to a precise focusing and optical imaging allowing depth estimation from diffracted rotation. Apart from implementation simplicity, the main advantages of the method are high energy efficiency, a possibility to operate with either complex amplitude or spatial spectrum of light and variability allowing a simple control of number of lobes of the point spread function."@en . . . . "8"^^ . . "15310" . . . "1990-2573" . . "We demonstrate both theoretically and experimentally that a spiral mask with a finite number of discrete phase levels allows a defocusing induced rotation of the point spread function in the vortex imaging. Two experimental configurations based on a spiral phase modulation of light and a spiral filtering of the spatial spectrum are studied in a unified theoretical treatment. The rotating point spread functions are analyzed in detail for imaging realized by the vortex lens and the 4-f system used in the spiral phase contrast microscopy. The theoretical results are verified by experiments using a spatial light modulator. The method is applicable to a precise focusing and optical imaging allowing depth estimation from diffracted rotation. Apart from implementation simplicity, the main advantages of the method are high energy efficiency, a possibility to operate with either complex amplitude or spatial spectrum of light and variability allowing a simple control of number of lobes of the point spread function." . "Rotating vortex imaging implemented by a quantized spiral phase modulation"@en . . "5/2013" . . . "Rotating vortex imaging implemented by a quantized spiral phase modulation" . "P(TE01020229), S" . "RIV/61989592:15310/13:33144450!RIV14-TA0-15310___" . . "Rotating vortex imaging implemented by a quantized spiral phase modulation"@en . . . "RIV/61989592:15310/13:33144450" . . "beams; tracking; generation; manipulation; localization; point-spread function; liquid-crystal devices; phase modulation; optical vortices; Singular optics"@en . . "2"^^ . . "DE - Spolkov\u00E1 republika N\u011Bmecko" . . "Rotating vortex imaging implemented by a quantized spiral phase modulation" . "Journal of the European Optical Society-Rapid publications (online)" . "10.2971/jeos.2013.13017" . . "2"^^ . "000315518600001" .