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volume fresnel zone plates fabricated by femtosecond laser direct writing

beam propagation modeling of modified volume fresnel zone plates fabricated by femtosecond laser direct writing

beam propagation modeling of modified volume fresnel zone plates fabricated by femtosecond laser direct writing

... Beam propagation modeling of modified volume Fresnel zone plates fabricated by femtosecond laser direct writing Pornsak Srisungsitthisunti,1Okan K. Ersoy,2,*and Xianfan ... 19, 2008 (Doc. ID 101731); published December 24, 2008Light diffraction by volume Fresnel zone plates (VFZPs) is simulated by the Hankel transform beam propaga-tion method (Hankel BPM). The method ... FZP can only be fabri-cated with small diffraction efficiency. The VFZP can be fabricated by femtosecond laser direct writing. This con-cept was experimentally demonstrated with an eight-layer...
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volume fresnel zone plates fabricated by femtosecond laser direct writing

volume fresnel zone plates fabricated by femtosecond laser direct writing

... letter, volume Fresnel zone plates fabricated inside fused silica using femtosecond laser direct writing are demonstrated. A volume zone plate consists of a number of layers of Fresnel zone plates designed ... diffraction efficiency.These volume Fresnel zone plates having various numbers oflayers were fabricated inside fused silica by femtosecond la-ser direct writing. Each volume Fresnel zone plate of ampli-tude ... pla-nar zone plate geometry. In this work, we investigate theeffect of increasing the number of Fresnel zone plates ormodified Fresnel zone plates within a volume, which we call volume zone plates, ...
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optimization of modified volume fresnel zone plate

optimization of modified volume fresnel zone plate

... 2009Modified volume Fresnel zone plates (MVFZPs) fabricated with laser direct writing were optimized for higherdiffraction efficiencies. The Fresnel radii in each layer of a volume zone plate were ... demonstrated high-efficiencyMVFZPs fabricated inside a fused silica by a femtosecond laser direct writing method [1,2]. The MVFZP replacesthe regular Fresnel zones with central rings [1–3]asshown ... 130.3120, 000.4430.1. INTRODUCTIONRecently, modified volume Fresnel zone plates (MVFZPs)consisting of several layers of Fresnel zone plates havebeen developed to improve diffraction efficiency...
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laser direct writing of volume modified fresnel

laser direct writing of volume modified fresnel

... vol-ume zone plates and 1.8ϫ 10−3for the laser processingconditions used for fabricating high NA volume zone plates. B. Low-Numerical-Aperture Volume Zone Plates Phase-type volume Fresnel zone plates ... number of Fresnel zone plates or modified Fresnel zone plates within a volume, which we called volume zone plates, to achieve high dif-fraction efficiency [9]. By using a series of zone plates, ef-2090 ... designed and fabricated low and high NA volume Fresnel zone plates inside a bulk of fused silica by femto-second laser direct writing. A new technique for modified Fresnel zone plates in which...
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optimization of modified volume fresnel zone plate

optimization of modified volume fresnel zone plate

... 2009Modified volume Fresnel zone plates (MVFZPs) fabricated with laser direct writing were optimized for higherdiffraction efficiencies. The Fresnel radii in each layer of a volume zone plate were ... demonstrated high-efficiencyMVFZPs fabricated inside a fused silica by a femtosecond laser direct writing method [1,2]. The MVFZP replacesthe regular Fresnel zones with central rings [1–3]asshown ... 130.3120, 000.4430.1. INTRODUCTIONRecently, modified volume Fresnel zone plates (MVFZPs)consisting of several layers of Fresnel zone plates havebeen developed to improve diffraction efficiency...
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controllable growth offlowerlike zno nanostructures by combining laser direct

controllable growth offlowerlike zno nanostructures by combining laser direct

... for 10 min.2.2. Laser direct writing Micropatterning of the as-prepared substrate was conducted by a femtosecond laser sy stem . A com merci al regenerative amplified Ti:Sapphire laser (RegA 9000, ... flowerlike ZnO nanos-tructures by combining laser direct writing and hydrothermal growthmethod. The control of the as -fabricated ZnO flowerlike structures canbe achieved by altering hydrothermal growth ... nanostruc-tures on GaN/LiAlO2substrates by combining laser direct writing and hy-drothermal method. In contrast with some flowerlike structures whichformed by self-assembly technologies using nanoparticles...
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laser direct writing of silicon field effect transistor sensors

laser direct writing of silicon field effect transistor sensors

... of laser direct writing ofsilicon wires. A laser beam (green) is focused on alocalized spot (red dot) where a silicon wire is synthe-sized. Fresnel phase zone plates were used to focus the laser ... wires aredeposited using laser direct writing in combination withCVD which we previously demonstrated for deposition ofintrinsic SiNWs.15The unique feature of the fabricated Siwires is that ... sub-strate. To achieve small dimensions, the laser beam wasfocused on a diffraction-limited spot as small as 250 nmusing high numerical aperture Fresnel phase zone plates. 15The substrate is a 200 nm-thick...
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plasma formation in fused silica induced by loosely focused femtosecond laser pulse

plasma formation in fused silica induced by loosely focused femtosecond laser pulse

... irradiated by a loosely focused high power femtosecond laser pulse is studied both experimentally and numerically. The experimental measurement ofplasma radiation shows that the laser pulse ... is observed at more than one spot alongthe laser propagation direction. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2183361͔ Femtosecond lasers have been proposed to microma-chine ... the laser beam isfocused near the focal plane when the laser energy is notvery high.14,15In this letter, we report focusing behind the focal planeinside fused silica by loosely focused femtosecond...
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plasma formation in fused silica induced by loosely focused femtosecond laser pulse

plasma formation in fused silica induced by loosely focused femtosecond laser pulse

... irradiated by a loosely focused high power femtosecond laser pulse is studied both experimentally and numerically. The experimental measurement ofplasma radiation shows that the laser pulse ... is observed at more than one spot alongthe laser propagation direction. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2183361͔ Femtosecond lasers have been proposed to microma-chine ... the laser beam isfocused near the focal plane when the laser energy is notvery high.14,15In this letter, we report focusing behind the focal planeinside fused silica by loosely focused femtosecond...
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Volume of retail trade down by 0.8% in euro area ppt

Volume of retail trade down by 0.8% in euro area ppt

... with November 2012 Volume of retail trade down by 0.8% in euro area Down by 0.6% in EU27 In December 2012 compared with November 2012, the volume of retail trade1 fell by 0.8% in the euro ... sales index dropped by 3.4% in the euro area and by 2.0% in the EU27. The average volume of retail trade index for 2012, compared with 2011, fell by 1.7% in the euro area and by 0.6% in the EU27. ... compared with November 2012, “Food, drinks and tobacco” fell by 0.8% in the euro area and by 0.6% in the EU27. The non-food sector declined by 1.0% and 0.7% respectively. Among the Member States...
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