Asymmetrically coupled bus with tunable ring resonators for multiple functionalities: Fano resonance, asymmetrical transmission, and wavelength shifting

Weiqiang Ding; Chengwei Qiu

doi:10.1117/12.905783

2 February 2012 Asymmetrically coupled bus with tunable ring resonators for multiple functionalities: Fano resonance, asymmetrical transmission, and wavelength shifting

Weiqiang Ding, Chengwei Qiu

Author Affiliations +

Proceedings Volume 8264, Integrated Optics: Devices, Materials, and Technologies XVI; 82640L (2012) https://doi.org/10.1117/12.905783
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

Transmission properties of bus waveguides coupled with two nested ring resonators are investigated using the finite difference in time domain (FDTD) method. Both the symmetrical and asymmetrical nested coupling structures are considered and different functionalities are realized in the single structure. Fano resonant transmission spectrums are obtained, of which the parameters can be tuned precisely by changing the position of the inner ring resonator. More importantly, near the Fano resonant wavelength, sharply asymmetrical field localizations in the two ring resonators are obtained when the same signals are incident from different ports. These properties are used to realize optical diodes with an ultra high contrast ratio larger than 2000. We also find that the frequencies of the resonant signals localized in the rings may be shifted due to the dynamic modulation of the coupling coefficients. These structures and properties presented here may find potential applications in nano-photonic systems.

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Weiqiang Ding and Chengwei Qiu "Asymmetrically coupled bus with tunable ring resonators for multiple functionalities: Fano resonance, asymmetrical transmission, and wavelength shifting", Proc. SPIE 8264, Integrated Optics: Devices, Materials, and Technologies XVI, 82640L (2 February 2012); https://doi.org/10.1117/12.905783

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KEYWORDS

Optical isolators

Resonators

Waveguides

Modulation

Refractive index

Diodes

Finite-difference time-domain method

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