Atelier Bonryu(E)

zone plate photography


Gallery: Zone Plate Photographs

Photon Sieve Photography:

Flowers & Park

As described in the Laboratory on Photon Sieve, the degree of freedom to choose parameters of a photon sieve is considerably large and there are various possibilities to design a pattern of a desired photon sieve.  Though this process may be carried out by computer simulation I chose parameter values of a photon sieve intuitively on the basis of the experience on the zone plate photography.  The following photographs are taken by using a photon sieve designed for the wavelength of 550 nm, the focal length of 50 mm, and the zone number of 19.  The diameters of pinholes are chosen to be 1.5 times as large as the corresponding zone width except for the central pinhole because the diameter of a pinhole of a photon sieve can be larger than the zone width of the corresponding zone plate ( Kipp, et al. ).  As determination of the distribution of pinholes along a circumference of a zone is a little complicated, it will be described elsewhere.

During taking these photographs I remarked the following points.  As in the case of the zone plate photography the photogenic object should be as bright as possible.  If the difference of brightness between the object and the background is sufficiently large a sharper and clearer photograph can be taken.  I took photographs by using photon sieves with zone number of 29 and 9, other than that of 19, and surprisingly it was found that the photograph by the zone number of 19 was clearer than that by the zone number of 29.  Moreover, the photograph taken by using a zone plate was far clearer than that by a photon sieve with the same zone number, which seems inconsistent with the theoretical expectation.  I have not solved the reason of the inconsistency but there is a possibility that the resolution of the minicopy film used for making a photon sieve may not be sufficiently good.  It is considered that the best resolution of the minicopy film (for microfilm copy) is around 0.006 -0.008 mm.  However, the radius of the pinholes on the outermost zone is around 0.03 mm and there is a possibility that the pinholes in outer zones do not contribute to the light convergence or even have malign influence.

(Slide show)

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 The following e-books (Amazon Kindle Book) have been published.

ピンホール写真(Pinhole Photography: Japanese Edition)
ゾーンプレート写真(Zoneplate Photography: Japanese Edition)

Soft Light and Shadow (English Edition)
--Zone Plate Photo Album (1) --*Version*=1&*entries*=0*Version*=1&*entries*=0

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(English Edition)

Complete Guide to

Zone Plate


Lensless Photography by Rings of Light

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