Resonance-splitting and enhanced notch depth in SOI ring resonators with mutual mode coupling
2008 (English)In: Optics Express, ISSN 1094-4087, Vol. 16, no 7, 4621-4630 p.Article in journal (Refereed) Published
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-mu m-radius ring, notch depth of 40 dB for the 10-mu m-radius ring, and intrinsic Q factor of 2.6 x 10(5) for the 20-mu m-radius ring are demonstrated. Notch depth improvement larger than 25dB has been reached in the 40-39-mu m-radius double-ring structure. The enhanced notch depth and increased modal area for the concentric rings might be promising advantages for bio-sensing applications.
Place, publisher, year, edition, pages
2008. Vol. 16, no 7, 4621-4630 p.
Directional couplers, Resonators, Time domain analysis, Wavelength, Mutual mode coupling, SOI ring resonators
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-8028DOI: 10.1364/OE.16.004621ISI: 000255100400026ScopusID: 2-s2.0-41649120161OAI: oai:DiVA.org:kth-8028DiVA: diva2:13237
QC 20100923. Uppdaterad från submitted till published (20100923).2008-02-222008-02-222010-09-23Bibliographically approved