|Table of Contents|

Influence of Single Dielectric Layer on Microscale Spherical Lens Imaging(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2017年02期
Page:
133-
Research Field:
·物理学·
Publishing date:

Info

Title:
Influence of Single Dielectric Layer on Microscale Spherical Lens Imaging
Author(s):
Du Bintao; Wang Tian; Guo Minglei; Xia Yang; Deng Yun; Ye Yonghong
School of Physics and Technology,Nanjing Normal University,Nanjing 210023,China
Keywords:
super-resolution film; microscale lenses; imaging
PACS:
O439
DOI:
10.3969/j.issn.1001-4616.2017.02.022
Abstract:
Imaging by barium titanate glass(BTG)embedded in polydimethylsiloxane(PDMS)film is a common technique to achieve optical super-resolution now. We propose to deposit a dielectric layer between the microsphere lens and the object surface,and study the imaging properties with different SU-8 thicknesses. Our experimental results reveal that the field of view(FOV)increases from 10.8 μm to 13.2 μm when the film thickness increases from 0 to 270 nm. It is found that the SU-8 layer with a thickness around 160 nm can obviously increase the imaging FOV and contrast. Moreover,for different dielectric layers with the same film thickness 160 nm,the SU-8 layer can improve FOV while the TiO2 layer cannot. We also found that the amount of light coupling into the dielectric layer decides the image quality. This phenomenon is explained by the destructive interference effect. Our findings can advance the understanding of the super-resolution imaging mechanisms in microscale lenses.

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Last Update: 2017-06-30