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Development of photonic crystal cavities to probe biological solutions with nanoscale resolution

Research Area: Super-resolved microscopy enabled by silicon photonics

Main Researcher: Saurav Kumar

Planar photonic crystal cavities are unique optical resonators that can confine light in a sub-wavelength volume and produce at the same time sharp frequency resonances. As a result, a strong light-matter interaction can take place and significantly modify some physical observables. The integration of such cavities on a chip enables the implementation of a highly resolved and sensitive spectrometry.
The research topic is focusing on the design of photonic crystal cavities in view of characterizing biomolecules based on a new technique called dynamic resonant optical frequency shift spectroscopy. The target is to determine the size and shape of single proteins in complex colloidal solutions.

Other people involved:


    International Journals

  1. K. Saurav, N. Le Thomas, Probing the fundamental detection limit of photonic crystal cavities, Optica, 4(7), p.757-763 doi:10.1364/optica.4.000757 (2017)  Download this Publication (1.4MB).
  2. K. Saurav, S. Kumari, N. Le Thomas, CMOS Fabricated Large Array of Free Standing Substrate-Less Photonic Crystal Cavities for Biosensing Applications, IEEE Photonics Journal, 9(2), doi:10.1109/JPHOT.2017.2684627 (2017)  Download this Publication (701KB).
      International Conferences

    1. N. Le Thomas, Fundamental sensing limits of integrated nanophotonic sensors, Latin America Optics & Photonics Conference (OSA - LAOP 2018) (invited), Peru, p.paper Tu2A.1 (2 pages) (2018)  Download this Publication (2MB).
    2. N. Le Thomas, Fundamental thermodynamic noise in integrated photonic sensors, Norwegian PhD Network on Nanotechnology for Microsystems Workshop (invited), Norway, (2018)  Download this Publication (1.2MB).
    3. K. Saurav, S. Kumari, N. Le Thomas, CMOS fabricated large array of free standing substrate-less photonic crystal cavities for biosensing applications, IEEE Photonics Conference (IPC), United States, p.493-501 doi:10.1109/ipcon.2017.8116198 (2017)  Download this Publication (5.9MB).
    4. K. Saurav, N. Le Thomas, Impact of the light coupling on the sensing properties of photonic crystal cavity modes, SPIE Photonics West, United States, p.paper 10077OP doi:10.1117/12.2251199 (2017)  Download this Publication (866KB).
    5. K. Saurav, N. Le Thomas, Imaging of photonic crystal cavity mode via refractive index sensing, Proceedings of the 21st Annual Symposium of the IEEE Photonics Benelux Chapter, Belgium, p.255-258 (2016)  Download this Publication (470KB).
    6. K. Saurav, N. Le Thomas, Mapping nano-object induced perturbations of photonic crystal cavity modes, PECS-XII, United Kingdom, (2016).
    7. K. Saurav, N. Le Thomas, Fabrication of substrate-less planar silicon photonic crystal cavities , Proceedings of the 20th Annual Symposium of the IEEE Photonics Benelux Chapter, (2015).
    8. K. Saurav, N. Le Thomas, On-chip photonic crystal cavity designs for nanoparticle characterization , Taking Detection to the Limit: Biosensing with Optical Microcavities., Germany, (2014)  Download this Publication (195KB).

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