Search results for "Extended depth of focus"

showing 3 items of 3 documents

3D printed diffractive terahertz lenses

2016

[EN] A 3D printer was used to realize custom-made diffractive THz lenses. After testing several materials, phase binary lenses with periodic and aperiodic radial profiles were designed and constructed in polyamide material to work at 0.625 THz. The nonconventional focusing properties of such lenses were assessed by computing and measuring their axial point spread function (PSF). Our results demonstrate that inexpensive 3D printed THz diffractive lenses can be reliably used in focusing and imaging THz systems. Diffractive THz lenses with unprecedented features, such as extended depth of focus or bifocalization, have been demonstrated.

DiffractionPoint spread function3d printedMaterials scienceTerahertz radiationPhase (waves)Diffractive lensesBinary optics02 engineering and technologyDiffraction efficiency01 natural sciences010309 opticsDiffractive lensOpticsImage quality assessment0103 physical sciencesDiffractive opticsExtended depth of focusbusiness.industry021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsTerahertz imagingFISICA APLICADAOptical fabrication0210 nano-technologybusiness
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All-optical super resolved and extended depth of focus imaging with random pinhole array aperture

2008

In this paper, we present a novel approach which allows combining super resolved imaging with extended depth of focus while the result is obtained by all-optical means and no digital processing is required. The presented approach for the super resolved imaging includes attaching a random pinhole array plate to the aperture plane of the imaging system. The energetic efficiency of the system is high and it is much larger than an imaging through a single pinhole which also has extended depth of focus. The super resolving result is obtained by mechanic scanning of the aperture plane with the random plate.

PhysicsExtended depth of focusArray aperturebusiness.industryComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONImage processingSuperresolutionAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsAll opticalOpticsAperture planePinhole (optics)Electrical and Electronic EngineeringPhysical and Theoretical ChemistrybusinessImage resolutionOptics Communications
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Bifractal focusing and imaging properties of Thue-Morse Zone Plates.

2015

We present a new family of Zone Plates (ZPs) designed using the Thue-Morse sequence. The focusing and imaging properties of these aperiodic diffractive lenses coined Thue-Morse Zone Plates (TMZPs) are examined. It is demonstrated that TMZPs produce a pair of self-similar and equally intense foci along the optical axis. As a consequence of this property, under broadband illumination, a TMZP produces two foci with an extended depth of focus and a strong reduction of the chromatic aberration compared with conventional periodic ZPs. This distinctive optical characteristic is experimentally confirmed.

PhysicsExtended depth of focusgenetic structuresbusiness.industryORDERDiffraction efficiencyElectromagnetic radiationAtomic and Molecular Physics and OpticsOptical axisDiffractive lensOpticsAperiodic graphFISICA APLICADAChromatic aberrationbusinessMATEMATICA APLICADAOptics express
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