Design of axially super-resolving phase filters using the method of generalized projections

After the femtosecond laser was invented, two-photon microfabrication technology has been recognized as an important method to fabricate the nanostructure and microstructure. In this paper, the two-photon microfabrication system is described, and some experiments are done. From the experiment results, it can be seen that the resolution of the two-photon microfabrication system can be improved by the expose time, the laser power, and the diffractive superresolution element (DSE). Finally, some threedimensional (3D) microstructure models are fabricated to show the potential of the two-photon microfabrication method.

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“…The DSE is aimed to sharpen the concentration of the radical photopolymer ξ(t); [18][19][20] its principle is shown in Figure 2.…”

Section: Superresolution Analysis Of the Two-photon Microfabricationmentioning

confidence: 99%

A Type of Two-Photon Microfabrication System and Experimentations

Peng

Feng

2011

ISRN Mechanical Engineering

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“…Another possibility for getting super-resolution in a focal spot is to set, in front of the focusing lens, an absorbing ring [17], or a system of annular dephasing zones [18][19][20]. The main drawback of these methods is that the shrinking of the central spot, in the focal plane, is done to the detriment of the surrounding rings which show their energy increasing [21].…”

Section: Introductionmentioning

confidence: 99%

Strong reducing of the laser focal volume

et al. 2011

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Many applications of lasers seek nowadays for focal spots whose corresponding volume is getting smaller and smaller in order to ensure high spatial resolution. This problem, studied by many research groups around the world, is the core of this research work which deals with controlling the focal volume of a focused laser beam. Indeed, our objective is to develop a new method based on spatial treatment of laser beams, allowing to solve, in an original and efficient manner, two fundamental issues that have not been treated satisfactorily yet, i.e. : (i) The generation of a special laser beam, which has the ability to produce a focal volume smaller than the one resulting from a more common Gaussian beam, when focused by an ordinary lens. The expected reduction factor of the focal volume is in the order of several hundreds, when the existing methods do not exceed few tenths. (ii) The decoupling between transversal and longitudinal resolutions within the focal volume, contrary to Gaussian beams whose depth of field is proportional to the square of its beam-waist radius. The method that it is developed is based on two steps: First, the laser is forced to oscillate on a high-order but single transversal mode TEM p0 , which is secondly spatially beam-shaped thanks a proper Diffractive Optical Element (DOE) that allocates the super-resolution feature².

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“…Therefore, the vectorial behavior of the electricomagnetic fields has to be taken into account for actual optical data storage systems. In the past decades, various filters were also designed using vectorial diffraction theory for different applications, such as axial superresolution for improving sectioning capability in three-dimensional imaging and three-dimensional optical storage [14], transverse superrsolution for all-optical magnetic recording [15], and extension of DOF for sub-micron-scale laser drilling and machining [13]. However, to the best of our knowledge, no studies investigate binary phase filters (BPFs) which can achieve transverse Contents lists available at ScienceDirect…”

Section: Introductionmentioning

confidence: 99%