Compact on-Chip Temperature Sensors Based on Dielectric-Loaded Plasmonic Waveguide-Ring Resonators
ABSTRACT The application of a waveguide-ring resonator based on dielectric-loaded surface plasmon-polariton waveguides as a temperature sensor is demonstrated in this paper and the influence of temperature change to the transmission through the waveguide-ring resonator system is comprehensively analyzed. The results show that the roundtrip phase change in the ring resonator due to the temperature change is the major reason for the transmission variation. The performance of the temperature sensor is also discussed and it is shown that for a waveguide-ring resonator with the resonator radius around 5 μm and waveguide-ring gap of 500 nm which gives a footprint around 140 μm2, the temperature sensitivity at the order of 10−2
K can be achieved with the input power of 100 μW within the measurement sensitivity limit of a practical optical detector.
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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.Optics Express 12/2011; 19(27):26423-8. DOI:10.1364/OE.19.026423 · 3.53 Impact Factor
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ABSTRACT: We consider the surface phonon polariton coupling in an SiO2 optical cavity with 250 nm metal (gold (Au)/chrome (Cr)) side walls, and find a temperature dependence of the quality factor, Q=ωo/Δω. By using optical cavities of varying widths between parallel metal walls and FTIR-ATR measurements, we first observe that the quality factor obeys an inverse power law dependence on the width. And by relating the widths to the optical path length, and ultimately to the temperature using the general thermo-optical coefficient, we show the quality factor temperature dependence. We argue that the temperature dependence of the quality factor is a practical and almost universal result that describes the energy dissipative behavior of both mechanically and optically responsive systems.Applied Physics Letters 09/2014; 105(11):114107-114107-4. DOI:10.1063/1.4895071 · 3.52 Impact Factor