Open AccessBidirectional subwavelength slit splitter for THz surface plasmons
Author(s) -
Qiaoqiang Gan,
Zhan Fu,
Yujie J. Ding,
F. J. Bartoli
Publication year - 2007
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.018050
Subject(s) - optics , finite difference time domain method , slit , terahertz radiation , surface plasmon , grating , splitter , beam splitter , physics , diffraction grating , excitation , plasmon , near and far field , surface plasmon polariton , surface wave , laser , quantum mechanics
We have conducted a feasibility study of a frequency splitter operating at THz frequencies, based on a bidirectional subwavelength slit simulated using two-dimensional finite difference time domain (FDTD) techniques. The near-field wave emanating from the narrow slit serves as a subwavelength-scaled excitation source. By placing two optimized grating structures on the opposite sides of the slit, the THz waves at different frequencies are guided in the two desired directions. Confinement of the optical field is illustrated for different surface structures.