Open AccessVariable spatial pattern probe based on offset launch of multimode waveguide for optogenetics
Author(s) -
Na Dong,
Weifeng Jiang,
Xiaohan Sun
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.010921
Subject(s) - multi mode optical fiber , optics , offset (computer science) , waveguide , materials science , coupled mode theory , optical fiber , physics , refractive index , computer science , programming language
We propose and demonstrate experimentally a variable spatial pattern probe based on offset launch at the input facet of multi-mode optical waveguide for the use of optogenetics, which could generate variable spatial patterns with micron scale at the output facet of the waveguide so that the optical stimulating location in the neural tissue can be changed. By using of coupling mode theory, finite element method (FEM) and light diffusion Monte-Carlo method, we simulate their mode patterns and evolvements for TE 00 , TE 10 , TE 20 and TE 11 modes, excited by offset launch at different input point of the probe with core size of 17.8 × 7.8 μm 2 , from the output port to 50μm in the tissue. The experimental chips including array multimode waveguides with different width are fabricated using the Silica-on-Silicon processing. We selectively excite TE 00 , TE 10 , TE 20 and TE 11 modes in the waveguide chip with core size of 17.8 × 7.8 μm 2 , test their patterns and obtain their evolvements. The experimental results are coincident with the simulation results.