Fabrication of spatial modulated second order nonlinear structures and quasi-phase matched second harmonic generation in a poled azo-copolymer planar waveguide.
This work demonstrates that arbitrary types of spatially modulated second-order susceptibility (chi((2)) structures such as 1D and 2D, periodic and quasi-periodic structures can be obtained by using the combination of corona poling and direct laser writing (DLW) techniques. The fabrication technique is based on the photodepoling of azo-dye molecules caused by one-photon or two-photon absorption during the DLW process. Polarization and second harmonic generation (SHG) images of the fabricated structures were measured by electrostatic force microscope and SHG mapping techniques, respectively. Furthermore, quasi-phase-matched (QPM) enhanced SHG from a 1D periodically poled azo-copolymer planar waveguide is demonstrated using an optical parametric oscillator laser by scanning wavelength from 1500 to 1600 nm. The resonant wavelength of the QPM enhanced SHG is peaked at 1537 nm with FWHM is congruent to 2.5 nm.
Lin
Jian Hung
JH
Department of Physics, National Chung Cheng University, Ming Hsiung, Chia Yi 621, Taiwan.
Lai
Ngoc Diep
ND
Chiu
Chau Han
CH
Lin
Chi-Yuan
CY
Rieger
Georg W
GW
Young
Jeff F
JF
Chien
Forest Shih-Sen
FS
Hsu
Chia Chen
CC
D001391:Azo Compounds / Q000737:chemistry*; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D055095:Optics and Photonics / Q000295:instrumentation*; D009991:Oscillometry / Q000295:instrumentation*; D011108:Polymers / Q000737:chemistry*
D001391:Azo Compounds; D011108:Polymers