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.

Date Published: 12 March 2019
PDF: 5 pages
Proc. SPIE 11023, Fifth Symposium on Novel Optoelectronic Detection Technology and Application, 110234L (12 March 2019); doi: 10.1117/12.2522005

Published in SPIE Proceedings Vol. 11023:
Fifth Symposium on Novel Optoelectronic Detection Technology and Application
Qifeng Yu; Wei Huang; You He, Editor(s)