Dr. See Wha Chung Profile

Dr. See Wha Chung

at Univ of Nottingham

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Proceedings Article | 12 March 2019 Paper

Periodical subwavelength light focusing by proximity projection grating structure

Feng Hu, W. See Chung

Proceedings Volume 11023, 110234L (2019) https://doi.org/10.1117/12.2522005

KEYWORDS: Diffraction gratings, Near field, Super resolution, Microscopy, Light wave propagation

Read Abstract +

The authors developed a technique of generating periodical subwavelength light focusing array. In the technique, a proximity projection grating structure (PPGS) is employed. The size of focal spot obtained is dependent on the refractive index of film material used in the PPGS. When the film with the refractive index greater than 4 is used, focal spots with size of can be obtained. Additionally, the subwavelength light focusing will appear periodically along the propagation direction, which leads to the light focusing in both near field and far field. Both simulations and experiments verify the developed technique. The periodical subwavelegnth light focusing array has the potential in super resolution imaging applications.

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