title: Fiber-pigtailed temperature sensors based on dielectric-loaded plasmonic waveguide-ring resonators.
abstract: We demonstrate optical fiber-pigtailed temperature sensors based on dielectric-loaded surface plasmon-polariton waveguide-ring resonators (DLSPP-WRRs), whose transmission depends on the ambient temperature. The DLSPP-WRR-based temperature sensors represent polymer ridge waveguides (~1×1 µm(2) in cross section) forming 5-µm-radius rings coupled to straight waveguides fabricated by UV-lithography on a 50-nm-thick gold layer atop a 2.3-µm-thick CYTOP layer covering a Si wafer. A broadband light source is used to characterize the DLSPP-WRR wavelength-dependent transmission in the range of 1480-1600 nm and to select the DLSPP-WRR component for temperature sensing. In- and out-coupling single-mode optical fibers are then glued to the corresponding access (photonic) waveguides made of 10-µm-wide polymer ridges. The sample is heated from 21°C to 46 °C resulting in the transmission change of ~0.7 dB at the operation wavelength of ~1510 nm. The minimum detectable temperature change is estimated to be ~5.1∙10(-3) °C for the bandwidth of 1 Hz when using standard commercial optical detectors.
authors.affiliation: Institute of Technology and Innovation (ITI), University of Southern Denmark, Odense M, Denmark.
authors.forename: Thomas B
authors.initials: TB
authors.lastname: Andersen
authors.forename: Sergey I
authors.initials: SI
authors.lastname: Bozhevolnyi
authors.forename: Laurent
authors.initials: L
authors.lastname: Markey
authors.forename: Alain
authors.initials: A
authors.lastname: Dereux
mesh_terms: D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D013817:Thermography / Q000295:instrumentation*; D014159:Transducers