title: Slot-waveguide biochemical sensor.
abstract: 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 microm. 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 2x10(-4) RIU.
authors.affiliation: Instituto de Sistemas Optoelectrónicos y Microtecnología (ISOM), Universidad Politécnica de Madrid, Spain. cbarrios@die.upm.es
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Barrios
authors.forename: Kristinn B
authors.initials: KB
authors.lastname: Gylfason
authors.forename: Benito
authors.initials: B
authors.lastname: Sánchez
authors.forename: Amadeu
authors.initials: A
authors.lastname: Griol
authors.forename: H
authors.initials: H
authors.lastname: Sohlström
authors.forename: M
authors.initials: M
authors.lastname: Holgado
authors.forename: R
authors.initials: R
authors.lastname: Casquel
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods