3d holographic display|14 Article(s)
High speed sub-micrometric microscopy using optical polymer microlens
X. H. Zeng, J. Plain, S. Jradi, P. Renaud Goud, R. Deturche, P. Royer, and R. Bachelot
We report the high speed scanning submicronic microscopy (SSM) using a low cost polymer microlens integrated at the extremity of an optical fiber. These microlenses are fabricated by a free-radical photopolymerization method. Using a polymer microlens with a radius of curvature of 250 nm, a sub-micrometric gold pattern is imaged experimentally by SSM. Different distances between the tip and the sample are used with a high scanning speed of 200 cm/s. In particular, metallic absorption contrasts are described with an optical spatial resolution of 250 nm at the wavelength of 532 nm. Moreover, finite-difference time-domain (FDTD) simulations concerning the focal lengths of microlenses with different geometries and heights support the experimental data.
Chinese Optics Letters
  • Publication Date: Jul. 08, 2021
  • Vol.7 Issue, 10 901 (2009)
Quality evaluation of phase reconstruction in LED-based digital holography
Yi Qin, and Jingang Zhong
Chinese Optics Letters
  • Publication Date: Jul. 09, 2021
  • Vol.7 Issue, 12 1146 (2009)
Method to improve the performance of reflectance diffuse optical imaging based on polygonal optical fibers arrangement
Weitao Li, Zhiyu Qian, and Ting Li
In order to improve the performance of reflectance diffuse optical imaging (rDOI), a novel polynomial geometry (PG) of optical fibers arrangement is proposed. Polynomial geometry is based on the hexagonal geometry (HG) and multicentered double-density (MD) mode. The overlapping sensitivity matrix, area ratio (AR), reconstruction image, two-absorber model, and contrast-to-noise ratio (CNR) in different depths are used to evaluate the performance of PG. The other three geometries including HG, rectangular geometry (RG), and MD mode are also compared with PG. The deformation of the reconstruction images is evaluted by circular ratio (CR). The results prove that the proposed PG has high performance and minimum deformation in quality of reconstruction image in rDOI.
Chinese Optics Letters
  • Publication Date: Jul. 08, 2021
  • Vol.7 Issue, 9 852 (2009)
Optical humidity-sensitive mechanism based on refractive index variation
Zhenyuan Wang, and Zhengtian Gu
A novel composite model is put forward for humidity-sensitive material based on Maxwell-Garnett and effective medium theory. The analytical expression of the relation between effective refractive index and relative humidity is shown with different absorption factors and porosities. The larger the absorption factor is, the higher the refractive index is. The refractive index of humidity-sensitive SiO<sub>2</sub> film decreases with the increase of ceramic material porosity. The sensitivity of optical humidity sensor can reach the magnitude of 10<sup>?3</sup>. In comparison with the experimental humidity-sensing curve by the method of p-polarized reflectance and the analysis of mechanism, theoretical simulation is in agreement with experimental results. Therefore, this composite model is proved to be reasonable which lays new theoretical foundation in further research on optical humidity sensor.
Chinese Optics Letters
  • Publication Date: Jul. 08, 2021
  • Vol.7 Issue, 9 756 (2009)
Advances in the light field displays based on integral imaging and holographic techniques (Invited Paper)
Nam Kim, Md. Ashraful, Le Thanh, Anh-Hoang Phan, Mei-Lan Piao, and Munkh-Uchral Erdenebat
Chinese Optics Letters
  • Publication Date: May. 20, 2014
  • Vol.12 Issue, 6 060005 (2014)
Design of broadband and wide-angle antireflection for solar cells
Wenliang Wang, and Honggang Hao
Chinese Optics Letters
  • Publication Date: Aug. 17, 2021
  • Vol.8 Issue, s1 35 (2010)