RT Journal Article
T1 High-Performance Bimodal Evanescent-Field Sensor with Coherent Phase Readout
A1 Torres-Cubillo, Antonia
A1 Luque-González, José Manuel
A1 Sánchez-Postigo, Alejandro
A1 Fernández-Gavela, Adrián
A1 Wanguemert-Pérez, Juan Gonzalo
A1 Molina-Fernández, Íñigo
A1 Halir, Robert
K1 Fotónica
K1 Silicio
K1 Detectores
AB By comparing optical signals travelling through a sensing and a reference arm, interferometric photonic sensors achieve remarkable sensitivities and detection limits using sim- ple single-wavelength laser sources. Sensors based on bimodal waveguides can, in principle, provide the same advantages without requiring a reference arm, by comparing the propagation of two modes travelling through a single sensing waveguide. However, typical implementations of bimodal sensors face two challenges: (i) the abrupt mode excitation and recombination at the sensor input and output is inefficient, unbalanced in power and produces spurious reflections that can mask small sensing signals, (ii) the sinusoidal nature of the output signal can lead to ambiguities in the readout. Here we present a spiralled bimodal refractive index sensor with full mode conversion, multiplexing and demultiplexing and a coherent phase detection, providing an unambiguous linear phase readout with a compact and robust layout. Our sensors have been designed for a 1550 nm central wavelength, fabricated on a silicon nitride platform and validated with bulk sensing experiments, achieving a limit of detection of 1.67 · 10^−7 RIU.
PB IEEE
YR 2023
FD 2023-12-13
LK https://hdl.handle.net/10630/29812
UL https://hdl.handle.net/10630/29812
LA eng
NO A. Torres-Cubillo et al., "High-Performance Bimodal Evanescent-Field Sensor with Coherent Phase Readout," in Journal of Lightwave Technology
NO This work has received funding from the Ministerio de Universidades, Ciencia e Innovacio ́n (FPU19/03330, PID2019- 106747RB-I00, PID2020-115204RB-I00), the Junta de An- daluc ́ıa (Agencia Andaluza del Conocimiento PY18-793, Consejer ́ıa de salud y familia PIN-0113-2020), and project TED2021-130400B-I00/ AEI/10.13039/501100011033/ Unio ́n Europea NextGenerationEU/PRTR.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026