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Photonic chips for sensing

We develop and characterize optical integrated circuits based on waveguide photopatterning using classical photolithography or a laser writing system onto polymer or glass materials.

Chips are characterized using a fiber alignment bench to butt-couple incoming (visible to Mid-IR) laser light into the waveguides and measure the output signal with photodetectors, camera and/or spectrum analyzer.

Laser writing setup

Fabrication, characterization, simulation

Previous work permitted to realize hybrid polymer based circuits: MZI thermo-optic switches, MMI couplers, DWDM Phasar multiplexers, MMI humidity[i] and dihydrogen sensors[ii].

SEM images of a star coupler

Waveguiding optical near-field probes were also fabricated using hybrid[iii] polymers.

Actually, the efforts are concentrated on ternary chalcogenide glasses for applications in the infrared spectrum in collaboration with the ChV team of the ICGM physico-chemistry institute.

The ternary glass composition was determined to lower refractive index fluctuations impact, enhance lifetime thanks to thermal stability and extend transparency domain from middle infrared (4 to 20µm) to include near-infrared regions (1µm to 16µm).


Ternary glass composition

Low loss (1.3dB/cm) single mode waveguides at 4.2µm wavelength were developed for carbon dioxyde detection[iv].


Transverse structure design, fabricated waveguides, real modes analysis

Projects, in additional collaboration with COMIC team of ITAP lab part of the IRSTEA, deal with measurements in agriculture for environmental care.

A DigitAg funded project uses water absorption at 1.55µm wavelength for spray deposit drop detection and measurement with the goal to provide a tool for helping to reduce chemical intrans in agriculture[v].

A MUSE funded project aims for bio-functionalization of the glass surface so as to develop biosensors for plants diseases prevention in collaboration with the Biophotonic team of the L2C lab.

[i] R.K.Kribich, B.MacCraith, R.Copperwhite, B.Kolodziejczyk and H.Barry, Novel Chemical/Bio–Sensor platform based on multimode interference couplers, Sensors and Actuators B, vol. 107(1), pp.188–192, May 2005.

[ii] T. Mazingue, M. Lomello-Tafin, C. Hernandez-Rodriguez, M. Passard, L. Goujon, J.-L. Rousset, F. Morfin, F. Bosselet, G. Maulion, R. Kribich, P. Coudray, B. Rolland, T. Wood, J.Le Rouzo, F. Flory, J.-F. Laithier, Pellet photonic innovant gas sensor using catalysis and integrated photonics, Sensors and Actuators B 222, 133–140, January 2016.

[iii] A.Tsigara, B.Mourched, P.Falgayrettes, B.Belier, E.L.Nativel, R.Kribich, P.Etienne, S.Calas, P.Gall–Borrut, Fabrication and mechanical properties of an organo–mineral cantilever–based probe for near–field optical microscopy, Sensors and Actuators A 212 (2014) 12–17, 2014.

[iv] C.Vigreux, M.Vu Thi, G.Maulion, R.Kribich, M.Barillot, V.Kirschner, A.Pradel, Wide-range transmitting chalcogenide films and development of micro-components for infrared integrated optics applications, Optical Materials Express, Vol. 4, Issue 8, pp. 1617–1631, 2014.

[v] C. Vigreux, M. Bathily, R. Escalier, R.K. Kribich, A. Pradel, R. Bendoula, First steps towards the realization of optical sensors to characterize spray deposits of pesticides on the leaves of vine plants, 19th International Conference on Transparent Optical Networks (ICTON), 2017.