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Damman wave zone plate

A zone plate and zone plate technology, which is applied in the field of diffractive optical elements, can solve problems such as uneven intensity distribution and achieve good application prospects

Inactive Publication Date: 2011-05-18
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Obviously, the disadvantage of this axial multifocal system is its inhomogeneous intensity distribution

Method used

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0026] 1. Theoretical design

[0027] see first figure 1 , figure 1 It is a schematic diagram of the focusing optical path of the Damman zone plate of the present invention. Such as figure 1As shown, it is a schematic diagram of a typical focusing imaging optical path after adding the Damman zone plate of the present invention. From left to right, according to the numbers, they are: uniform plane incident wave 001; Damman zone plate 100; aberration-absorbing focusing lens 300; lens focal plane 200. With the focal point of the focusing lens as the center, a cylindrical coordinate system is established, where the optical axis is along the z-axis, and the axial light field distribution near the focal point can be expressed as

[0028] E ( ...

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Abstract

The invention relates to a damman wave zone plate which is characterized in that a phase modulation detail is added in each period of the traditional binary phase-only type (0, pi) zone wave plate structure relative to the square of the radial coordinate so as to generate axial constant-strength distribution of focal spots with any numbers within a certain range. The distribution of a plurality of constant-strength focal spots along the optical axis direction can be widely applied to imaging systems (optical microscopes), optical tweezers, implantable contact lens, and the like with large depth of field-. Besides, the damman wave zone plate in binary phase-only distribution is a series of concentric circle structures intuitively and is easy to process and duplicate. Therefore, the damman wave zone plate has important application prospect in the fields of optical imaging systems and biomedicine.

Description

technical field [0001] The invention relates to a diffractive optical element, in particular to a Damman zone plate, which is used in conjunction with a focusing lens to realize the distribution of multiple focal spots with equal intensity in the axial direction. Background technique [0002] As we all know, the Fresnel zone plate is an ancient optical device, which can focus electromagnetic waves into infinite focal points without a lens, so it is also called a diffractive lens. In practical applications, people often only use its first main focus, because the intensity of other focuses decays rapidly with the increase of the order. In fact, for the binary zone plate, the maximum efficiency of the first main focus is about 40% (when the phase is π). In recent years, a new type of zone plate—fractal zone plate has been proposed [G.Saavedra, W.D.Furlan, and J.A.Monsoriu, Opt.Lett.28, 971-973(2003)]. This zone plate can generate fractal focal spot distribution near the focal...

Claims

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Application Information

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IPC IPC(8): G02B5/18
Inventor 周常河余俊杰
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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