Carbon Nanotube Array Based Binary Gabor Zone Plate Lenses

Sunan Deng,Kyle Jiang,Haider Butt,Chi Li,Qing Dai,David Benton,Ali K Yetisen,Tahseen Jwad

doi:10.1038/s41598-017-15472-9

Abstract

Diffractive zone plates have a wide range of applications from focusing x-ray to extreme UV radiation. The Gabor zone plate, which suppresses the higher-order foci to a pair of conjugate foci, is an attractive alternative to the conventional Fresnel zone plate. In this work, we developed a novel type of Beynon Gabor zone plate based on perfectly absorbing carbon nanotube forest. Lensing performances of 0, 8 and 20 sector Gabor zone plates were experimentally analyzed. Numerical investigations of Beynon Gabor zone plate configurations were in agreement with the experimental results. A high-contrast focal spot having 487 times higher intensity than the average background was obtained.

Highlights

Diffractive zone plates have a myriad of applications in the short wavelength regime where ordinary glass is opaque[1,2,3]
We show the development of a binary Gabor zone plate (GZP) lens with CNT array
The 0 sector GZP lens behaves analogous to a Fresnel zone plate (FZP) lens with multiple focal points, while the 8 sector GZP lens has only one focal point

Summary

Binary Gabor Zone Plate Lenses

Sunan Deng[1,2], Tahseen Jwad[1], Chi Li3, David Benton[4], Ali K. The Gabor zone plate, which suppresses the higher-order foci to a pair of conjugate foci, is an attractive alternative to the conventional Fresnel zone plate. Diffractive zone plates have a myriad of applications in the short wavelength regime where ordinary glass is opaque[1,2,3] They enable focusing x-ray and extreme UV radiation, such as x-ray microscopy using synchronous sources[4], x-ray astronomy[5], and UV spectroscopy[6,7]. The Gabor zone plate (GZP), which suppresses the higher-order foci to a pair of conjugate foci at f = ± r12/λ 5, is an attractive alternative to the conventional FZP lens. A binary Gabor zone plate consists of transparent and opaque zones with respect to the incident irradiation which allows it to act as a lens. With 650 nm incident light, the lenses can focus light with a spot intensity 487 times higher than the average background

Results and Discussions

Signal noise ratio

Conclusion

Author Contributions

Additional Information