Open AccessTunable guided-mode resonances in coupled gratings
Author(s) -
Hahn Young Song,
Sangin Kim,
Robert Magnusson
Publication year - 2009
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.17.023544
Subject(s) - optics , coupled mode theory , rigorous coupled wave analysis , guided mode resonance , coupling (piping) , resonance (particle physics) , wavelength , materials science , mode coupling , mode (computer interface) , diffraction grating , optoelectronics , physics , refractive index , computer science , particle physics , metallurgy , operating system
We present a rigorous numerical analysis on tunable characteristics of guided-mode resonances (GMRs) in coupled gratings. Two schemes of strong and negligible evanescent coupling of guided modes are treated. Both show wide range tunability. In the case of strong evanescent coupling, independent control of the center wavelength and the linwidth of the resonance is obtained via variations of a gap size between the gratings and lateral alignment conditions. We believe that this characteristic will provide a useful means to realize a tunable filter in conjunction with micro/nano-electromechanical system technologies. We also present a generalized theoretical analysis on the tunable characteristics of the GMRs in coupled gratings, which is qualitatively in good agreement with the numerical analysis.