Germanium and silicon based photonics



Silicon photonics is a very attractive research field as it enables the monolithic integration of optical and microelectronic components at the chip-scale. Potential applications can be found in a wide range of technical domains such as IT, sensing, security, and even biotechnologies.

Since its creation, Sinaps lab is highly involved in this research field. Our team is now working on diverse topics, listed below:

  • Si-based photonics:

    Boasting a strong experience in designing and fabricating photonic nanostructures in silicon-on-insulator (SOI), we are currently working on photonic crystal nanocavities with new designs, micro-ring resonators, and photonic nanotweezers development for lab-on-chip applications.

  • Ge-based photonics:

    We investigate germanium as a potential material for light emission by applying large amounts of tensile stress. Our work include process development at the PTA and photoluminescence and photocurrent characterization.

Silica Whispering Gallery Mode (WGM) resonators on-chip


Available facilities




Micro-photoluminescence measurements are performed using a Horiba iHR 320 spectrometer. The pump laser can be focused up to 5µm diameter spot. The emitted signal is collected through an optical fiber and sent to the spectrometer with an extended InGaAs photo-detector at the output. Several setup extensions can be envisioned.



FTIR spectrometry


Our optics lab is equipped with a home-built step-scan FTIR micro-spectrometer using a lock-in amplifier for small signal detection. Its possibilities are micro-photocurrent, micro-electroluminescence and micro-photoluminescence in the 0.9-3.0µm range.




Nanophotonic characterization & optofluidic setup


Our lab has also a photonic characterization bench designed for silicon-based photonics. A tunable laser source working at telecom wavelength makes it possible to study the spectral response of a wide range of integrated photonic micro- and nanostructures.

This setup has been also specially upgraded for on-chip optofluidic applications. It is equipped with microfluidic tools and a home-made fluorescence microscope.





WGM resonator setup


The optical performances of various silica WGM resonators are also characterized @ SiNaPS by coupling the optical WGM to a home-made tapered fiber in the 1500 nm wavelength range. In addition it allows us to study the coupling of light emitters with WGM.

This setup is being upgraded for the gyroscopic application.







FTIR spectrometry


Nanophotonic characterization & optofluidic setup


WGM resonator setup


Main collaborations :


            Université de Dijon, LICB (near-field microscopy, optofluidics)

            CNRS LTM (microfluidics, biology)


            CEA LETI (sensing, Ge photonics)

            LMN Switzerland (Ge photonics)

            ESRF (Ge photonics)


            CEA / LETI / DSIS (Integrated Optical Resonator Gyroscope)

            CNES (Integrated Optical Resonator Gyroscope)


            CEA / LETI / DTSI (SiOCH light emitters)




  • Vincent CALVO
  • Emmanuel PICARD
  • Jean-Baptiste JAGER
  • Nicolas PAUC
  • Emmanuel HADJI



  • Alban GASSENQ,
  • Laurent MILLORD


- Alumni:

  • Benoit CLUZEL
  • Philippe VEHLA
  • Kevin FOUBERT
  • Claude RENAUT
  • Christophe PIN
  • Kevin GUILLOY

Last update : 10/14 2016 (1200)


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