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—A biosensor application of vertically coupled glass mi-croring resonators with Q ∼ 12 000 is introduced. Using balanced photodetection, very high signal to noise ratios, and thus high sensitivity to refractive index changes (limit of detection of 1.8 × 10 −5 refractive index units), are achieved. Ellipsometry and X-ray pho-toelectron spectroscopy results(More)
Single femtosecond laser pulses are used to modify the surface of c-Si waveguides clad by SiO<sub>2</sub> for permanent tuning of microring resonators. Positive, controllable resonance shifts that vary with fluence are demonstrated, inducing little loss.
Efficient light-to-heat conversion due to ohmic loss in a Au/SiO<sub>2</sub>/SU-8 plasmonic microring resonator was exploited to achieve all-optical switching. We obtained 20 times larger resonance shift in the resonator over similar SU-8 dielectric microrings.
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