Yaoyu Cao

Publications (3)10.57 Total impact

• Article: Direct laser writing of three-dimensional narrow bandgap and high refractive-index PbSe structures in a solution.

  Zongsong Gan, Yaoyu Cao, Min Gu
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  ABSTRACT: Three-dimensional (3D) micro/nano structures made of narrow electronic bandgap semiconductor materials have important applications in a wide range of disciplines. Direct laser writing (DLW) provides the unparalleled advantage to fabricate 3D arbitrary geometric structures at the micro and nano meter scale. The fabrication of 3D structures within bulk narrow electronic bandgap semiconductor materials by DLW is challenged for the top-down strategy due to their narrow bandgap and high refractive index. Here, we report on the bottom-up strategy for the fabrication of 3D micro/nano structures made from PbSe with an electronic bandgap as narrow as 0.27 eV and a refractive index as high as 4.82 in a solution.
  Optics Express 05/2013; 21(9):11202-8. · 3.59 Impact Factor
• Source

  Available from: Baohua Jia

  Article: High-photosensitive resin for super-resolution direct-laser-writing based on photoinhibited polymerization.

  Yaoyu Cao, Zongsong Gan, Baohua Jia, Richard A Evans, Min Gu
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  ABSTRACT: An ethoxylated bis-phenol-A dimethacrylate based photoresin BPE-100 of relatively high photosensitivity and modulus is used for the creation of sub-50 nm features. This is achieved by using the direct laser writing technique based on the single-photon photoinhibited polymerization. The super-resolution feature is realized by overlapping two laser beams of different wavelengths to enable the wavelength-controlled activation of photoinitiating and photoinhibiting processes in the polymerization. The increased photosensitivity of the photoresin promotes a fast curing speed and enhances the photopolymerization efficiency. Using the photoresin BPE-100, we achieve 40 nm dots for the first time in the super-resolution fabrication technique based on the photoinhibited polymerization, and a minimum linewidth of 130 nm. The influence of the power of the inhibiting laser and the exposure time on the feature size is studied and the results agree well with the prediction obtained from a simulation based on a non-steady-state kinetic model.
  Optics Express 09/2011; 19(20):19486-94. · 3.59 Impact Factor
• Article: Superresolution-focal-volume induced 3.0 Tbytes/disk capacity by focusing a radially polarized beam.

  Xiangping Li, Yaoyu Cao, Min Gu
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  ABSTRACT: This paper reports on the study of the superresolution volume of the focal spot by focusing a radially polarized beam. This feature is achieved by increasing the inner radius of a high NA annular objective to break the diffraction-limited volume of a focal spot. The application of this finding into two-photon induced three-dimensional optical data storage leads to an enhanced photoreduction threshold effect in recording. As such, multilayer subdiffraction optical recording is experimentally demonstrated with an equivalent capacity of 3.0 Tbytes/disk.
  Optics Letters 07/2011; 36(13):2510-2. · 3.40 Impact Factor