We report an experimental demonstration of an integrated biochemical sensor based on a slot-waveguide microring resonator. The microresonator is fabricated on a Si3N4-SiO2 platform and operates at a wavelength of 1.3 μm. The transmission spectrum of the sensor is measured with different ambient refractive indices ranging from n=1.33 to 1.42. A linear shift of the resonant wavelength with increasing ambient refractive index of 212 nm/refractive index units (RIU) is observed. The sensor detects a minimal refractive index variation of 2×10−4 RIU.
© 2007 Optical Society of America
Original Manuscript: August 6, 2007
Revised Manuscript: September 13, 2007
Manuscript Accepted: September 16, 2007
Published: October 17, 2007
Vol. 2, Iss. 12 Virtual Journal for Biomedical Optics
Carlos A. Barrios, Kristinn B. Gylfason, Benito Sánchez, Amadeu Griol, H. Sohlström, M. Holgado, and R. Casquel, "Slot-waveguide biochemical sensor," Opt. Lett. 32, 3080-3082 (2007)