Open AccessResonance-splitting and enhanced notch depth in SOI ring resonators with mutual mode coupling
Author(s) -
Ziyang Zhang,
Matteo Dainese,
Lech Wosinski,
Min Qiu
Publication year - 2008
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.16.004621
Subject(s) - optics , radius , resonator , resonance (particle physics) , coupling (piping) , materials science , wavelength , coupling coefficient of resonators , silicon on insulator , ring (chemistry) , physics , optoelectronics , atomic physics , chemistry , silicon , computer security , organic chemistry , computer science , metallurgy
Resonance-splitting and enhanced notch depth are experimentally demonstrated in micro-ring resonators on SOI platform as a result of the mutual mode coupling. This coupling can be generated either by the nanometer-scaled gratings along the ring sidewalls or by evanescent directional coupling between two concentric rings. The transmission spectra are fitted using the time-domain coupled mode analysis. Split-wavelength separation of 0.68 nm for the 5-microm-radius ring, notch depth of 40 dB for the 10-microm-radius ring, and intrinsic Q factor of 2.6 x 10(5) for the 20-microm-radius ring are demonstrated. Notch depth improvement larger than 25 dB has been reached in the 40-39-microm-radius double-ring structure. The enhanced notch depth and increased modal area for the concentric rings might be promising advantages for bio-sensing applications.