Reflection-mode sensing using optical microresonators

Koch, Barry; Yi, Yasha; Zhang, Jun-Ying; Znameroski, Stephen; Smith, Terry
November 2009
Applied Physics Letters;11/16/2009, Vol. 95 Issue 20, p201111
Academic Journal
The authors present an approach for applying optical microring resonators to sensing. The approach relies on the interaction of the resonator with a nanoparticle taggant, which can induce coupling between forward and backward propagating traveling-wave resonant modes of the device. In the conventional four-port Add/Drop filter configuration, such coupling results in significant build-up of output intensity at ports that would normally be “dark.” Because the increased intensity occurs across a wide range of device resonances, the sensor may be interrogated using broadband excitation and with a broadband detector, enabling a low-cost, robust system.


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