Experimental generation and characterization of Devil’s vortex-lenses

Calatayud, Arnau; Rodrigo, José A.; Remón, Laura; Furlan, Walter D.; Cristóbal, Gabriel; Monsoriu, Juan A.

doi:10.1007/s00340-012-4913-0

Cited by 27 publications

(21 citation statements)

References 19 publications

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“…The procedure to compensate the wavefront distorsions caused by the lack of flatness of the SLM and the other optical components was detailed elsewhere [21]. In addition to the diffractive lenses, a linear phase carrier was modulated on the SLM to avoid the noise originated by the specular reflection (zero order diffraction) and the pixelated structure of the SLM (higher diffraction orders).…”

Section: Resultsmentioning

confidence: 99%

Twin axial vortices generated by Fibonacci lenses

et al. 2013

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Abstract:Optical vortex beams, generated by Diffractive Optical Elements (DOEs), are capable of creating optical traps and other multifunctional micromanipulators for very specific tasks in the microscopic scale. Using the Fibonacci sequence, we have discovered a new family of DOEs that inherently behave as bifocal vortex lenses, and where the ratio of the two focal distances approaches the golden mean. The disctintive optical properties of these Fibonacci vortex lenses are experimentally demonstrated. We believe that the versatility and potential scalability of these lenses may allow for new applications in micro and nanophotonics.

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Section: Resultsmentioning

confidence: 99%

Twin axial vortices generated by Fibonacci lenses

et al. 2013

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“…First wavefront distortions are measured for zero modulation of the SLM. Then, the complex conjugated of the retrieved phase was addressed to the SLM to cancel the unwanted distorsions [14]. In addition, a linear carrier phase is modulated on the SLM in order to avoid the noise originated from the specular reflection (zero order of diffraction), and also the noise caused by high diffraction orders due to its pixelated structure.…”

Section: Experimental Set Upmentioning

confidence: 99%

Through-focus response of multifocal intraocular lenses evaluated with a spatial light modulator

et al. 2012

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“…Singh et al 33 proposed the double phase-image encryption using GTs, in which the structured phase mask is derived from DVFL in the frequency plane. Some recent studies have also introduced structured phase mask based on devil's vortex Fresnel lens (DVFL) 34,35,36,37,38 .…”

Section: Introductionmentioning

confidence: 99%

Optical image encryption technique based on deterministic phase masks

et al. 2016

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Abstract. The double random phase encoding (DRPE) scheme, which is based on a 4f optical correlator system, is considered as a reference for the optical encryption field. In this work, we propose a modification of the classical DRPE scheme based on the use of a novel class of structured phase masks, the deterministic phase masks. In particular, we propose to conduct the encryption process by using two deterministic phase masks, which are built from linear combinations of several sub-keys. For the decryption step, the input image is retrieved by using the complex conjugate of the deterministic phase masks, which were set in the encryption process. This new concept of structured masks gives rise to encryption-decryption keys which are smaller and more compact than those required in the classical DRPE. In addition, we show that our method significantly improves the tolerance of the DRPE method to shifts of the decrypting phase mask -when no shift is applied, it provides similar performance to the DRPE scheme in terms of encryption-decryption results-. This enhanced tolerance to the shift, which is proven by providing numerical simulation results for gray-scale and binary images, may relax the rigidity of an encryptiondecryption experimental implementation set-up. To evaluate the effectiveness of the described method, the meansquare-error (MSE) and the peak signal-to-noise ratio (PSNR) between the input images and the recovered images are calculated. Different studies based on simulated data are also provided to highlight the suitability and robustness of the method when applied to image encryption-decryption processes.

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Experimental generation and characterization of Devil’s vortex-lenses

Cited by 27 publications

References 19 publications

Twin axial vortices generated by Fibonacci lenses

Twin axial vortices generated by Fibonacci lenses

Through-focus response of multifocal intraocular lenses evaluated with a spatial light modulator

Optical image encryption technique based on deterministic phase masks

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