Development of mid-IR waveguides to implement high resolution spectrometers in integrated optics

Myriam Bonduelle; Guillermo Martin; Alain Morand; Javier R. Vazquez de Aldana; Carolina Romero Vázquez; Nadège Courjal; Antoine Coste

doi:10.1117/12.2629859

29 August 2022 Development of mid-IR waveguides to implement high resolution spectrometers in integrated optics

Myriam Bonduelle, Guillermo Martin, Alain Morand, Javier R. Vazquez de Aldana, Carolina Romero Vázquez, Nadège Courjal, Antoine Coste

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121885R (2022) https://doi.org/10.1117/12.2629859
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

This work aims to present a new miniature spectrometer in the mid InfraRed (L Band), using the SWIFTS (Stationary Wave Integrated Fourier Transform Spectrometer) technology. A stationary wave obtained by injecting light on both sides of a channel waveguide (Gabor configuration) is sampled using nano-scattering centres (grooves) on the surface of the waveguide. A single groove per scattering centre will radiate the sampled signal with wide angular distribution, which is not compatible with the buried detection area of infrared detectors, resulting in crosstalk between pixels. An implementation of multiple grooves (antenna) for each sampling centre is proposed as a solution to improve directivity towards the detector pixel by narrowing the scattering angle of the extracted light. Here, the results are obtained using a Lithium Niobate (LiNbO3) substrate, as its electro-optic properties allow for an active modulation of the phase, and the technology explored for its fabrication is Direct Laser Writing, that allows to have buried 3D waveguides and nanogrooves. In order to integrate the detector in the device, different configurations are explored so as to obtain a robust and high-resolution device useful mainly for astronomical applications such as spectro-interferometry.

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Myriam Bonduelle, Guillermo Martin, Alain Morand, Javier R. Vazquez de Aldana, Carolina Romero Vázquez, Nadège Courjal, and Antoine Coste "Development of mid-IR waveguides to implement high resolution spectrometers in integrated optics", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121885R (29 August 2022); https://doi.org/10.1117/12.2629859

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