Ngoc Diep Lai

By Ngoc Diep Lai, Jian Hung Lin, Danh Bich Do,Wen Ping Liang, Yu Di Huang, Tsao Shih Zheng, Yi Ya Huang, Chia Chen Hsu

Part of the book: Holography

By Xiao Wu, Thi Thanh Ngan Nguyen, Isabelle Ledoux-Rak, Chi Thanh Nguyen and Ngoc Diep Lai

Part of the book: Holography

By Dam Thuy Trang Nguyen, Mai Trang Do, Qinggle Li, Quang Cong Tong, Thi Huong Au and Ngoc Diep Lai

A simple and low-cost technique called low one-photon absorption (LOPA) direct laser writing (DLW) is demonstrated as an efficient method for structuration of multidimensional submicrostructures. Starting from the diffraction theory of the electromagnetic field distribution of a tightly focused beam, the crucial conditions for LOPA-based DLW are theoretically investigated, and then experimentally demonstrated using a simple optical confocal microscope. Various 1D, 2D, and 3D submicrostructures were successfully fabricated in different materials, such as commercial SU8 photoresist and magnetic nanocomposite. The advantages and drawbacks of this LOPA-based DLW technique were also studied and compared with the conventional two-photon absorption based DLW. Several methods were proposed to overcome the existing problem of the DLW, such as the dose accumulation and shrinkage effect, resulting in uniform structures with a small lattice constant. The LOPA-based DLW technique should be useful for the fabrication of functionalized structures, such as magneto-photonic and plasmon photonic crystals and devices, which could be interesting for numerous applications.

Part of the book: Theoretical Foundations and Application of Photonic Crystals

By Quang Cong Tong, Fei Mao, Mai Hoang Luong, Minh Thanh Do, Rasta Ghasemi, Tran Quoc Tien, Tho Duc Nguyen and Ngoc Diep Lai

Surface plasmon resonance has attracted more and more attention thanks to its wide range of applications in numerous fields (physics, chemistry, biology, etc.). In this chapter, we present different aspects, from theoretical calculation and experimental fabrication to applications demonstration, related to arbitrary shape plasmonic nanostructures. First, numerical calculations based on finite-difference time-domain method were realized to investigate the plasmonic properties of gold nanostructures having various size and shapes. Then the direct laser writing method was demonstrated as an excellent tool for fabrication on demand of arbitrary nanostructures. Plasmonic structures were obtained indirectly by a standard lift-off method from a polymeric template and directly by tightly focusing a continuous-wave laser beam onto a metallic thin film. Finally, demonstration of various applications of fabricated plasmonic structures, namely plasmonic-based data storage, color nanoprinter, tunable filters, and plasmonic-magneto-optics sensors will be shown.

Part of the book: Plasmonics