Plasmonic Layer as a Localized Temperature Control Element for Surface Plasmonic Resonance-Based Sensors.

Surface plasmon resonance (SPR) sensing is a well-established high-sensitivity, label-free and real-time detection technique for biomolecular interaction study. Its primary working principle consists of the measurement of the optical refractive index of the medium that is in close vicinity of the sensor surface. Bio-functionalization techniques allow biomolecular events to be located in such a way. Since optical refractive indices of any medium varies with the temperature, the place where the measurement takes place shall be within a temperature-controlled environment in order to ensure any temperature fluctuation is interpreted as a biomolecular event. Since the SPR measurement probes the sensed medium within the penetration depth of the plasmonic wave, which is less or in the order of 1 µm, we propose to use the metallic film constituting the detection surface as a localized heater aiming at controlling finely and quickly the temperature of the sensed medium. The Joule heating principle is then used and the modeling of the heater is reported as well as its validation by thermal IR imaging. Using water as a demonstration medium, SPR measurement results at different temperatures are successfully compared to the theoretical optical refractive index of water versus temperature.

Ultracompact optical filter based on a stub resonator in GaInAsP/InP optical wire technology.

We report on the fabrication and characterization of a very compact filtering structure based on a resonant stub fabricated using optical wire technology in the InP material line. The stub length is close to 1.6 microm and has been designed to get a resonance wavelength close to 1550 nm. The characterization showed a resonance frequency at 1520 nm with a 12 dB resonance peak.

Wide electrical tunability of a GaInAsP/InP microdisk resonator.

We report on the characterization of an InP/InGaAsP-material-based microdisk resonator optical filter. The originality here is constituted by the use of a localized control electrode that is used for the tuning of the resonance wavelength of the filter via the injection of a driving current. Tuning of the resonance wavelength close to 8 nm has been experimentally achieved for a drive current of 80 mA.