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Raman spectroscopy on a siliconnitride waveguide platform

Research Area: Photonic integrated circuits for the visible/near IR , Silicon photonics for lab-on-chip spectroscopy

Main Researcher: Ashim Dhakal

Raman spectroscopy provides spectrum of the vibrational energy of the chemical bonds of the molecules and therefore provides an accurate means for identification of the molecules or their concentration. However, Raman signal is very weak due to its very small scattering cross section. On the one hand, owing to enhancement of the field near the waveguides, and long interaction length, Raman signal can be enhanced significantly using waveguides. On the other hand, the waveguides can be structured to form cavities for further enhancement. Thus, photonic waveguides provide an excellent means for efficient, cost-effective and small form-factor Raman spectroscopy. We use silicon-nitride (Si3N4) based waveguides and other integrated photonic elements such as ring resonators, DBRs, etc fabricated using advanced CMOS processing techniques for on-chip Raman spectroscopy on the analyte placed in the close proximity to the waveguides.

Other people involved:

Related Research Projects

Publications

    International Journals

  1. A. Dhakal, P.C. Wuytens, A. Raza, N. Le Thomas, R. Baets, Silicon Nitride Background in Nanophotonic Waveguide Enhanced Raman Spectroscopy, Materials, 10(140), (2017)  Download this Publication (1.6MB).
  2. A. Dhakal, P.C. Wuytens, F. Peyskens, K. Jans, N. Le Thomas, R. Baets, Nanophotonic waveguide enhanced Raman spectroscopy of biological submonolayers, ACS Photonics, 3(12), p.2141-2149 (2016).
  3. F. Peyskens, A. Dhakal, P. Van Dorpe, N. Le Thomas, R. Baets, Surface Enhanced Raman Spectroscopy Using a Single Mode Nanophotonic-Plasmonic Platform, ACS Photonics, 3(1), p.102-108 (2016).
  4. A. Subramanian, E.M.P. Ryckeboer, A. Dhakal, F. Peyskens, A. Malik, B. Kuyken, H. Zhao, S. Pathak, A. Ruocco, A. De Groote, P.C. Wuytens, D. Martens, F. Leo, W. Xie, U.D. Dave, M. Muneeb, Pol Van Dorpe, Joris Van Campenhout, W. Bogaerts, P. Bienstman, N. Le Thomas, D. Van Thourhout, Zeger Hens, G. Roelkens, R. Baets, Silicon and silicon nitride photonic circuits for spectroscopic sensing on-a-chip , Photonics Research (invited), 5(3), p.B47 (2015)  Download this Publication (1.5MB).
  5. A. Dhakal, A. Subramanian, P.C. Wuytens, F. Peyskens, N. Le Thomas, R. Baets, Evanescent excitation and collection of spontaneous Raman spectra using silicon nitride nanophotonic waveguides, Optics Letters, 39(13), p.4025-4028 (2014).
      International Conferences

    1. E.M.P. Ryckeboer, D. Martens, H. D'heer, P. Bienstman, D. Van Thourhout, R. Baets, Optofluidic devices based on Silicon photonics, EOS World of Photonics Congress (invited), (2017).
    2. P.C. Wuytens, A.G. Skirtach, R. Baets, Nanotriangle Decorated Silicon Nitride Waveguides for Integrated Surface-Enhanced Raman Spectroscopy, CLEO: Science and Innovations 2017, STh1M(8), United States, (2017)  Download this Publication (392KB).
    3. A. Raza, P.C. Wuytens, F. Peyskens, S. Clemmen, P. V. Dorpe, R. Baets, On-chip Enhanced Raman spectroscopy using metal slot waveguide, European Conference on Integrated Optics (ECIO), 19(T7.4), Netherlands, (2017).
    4. S. Clemmen, A. Raza, A. Dhakal, F. Peyskens, A. Subramanian, P, Van Dorpe, P.C. Wuytens, H. Zhao, E.M.P. Ryckeboer, S. Severi, N. Le Thomas, R. Baets, Spectroscopic sensing with silicon nitride photonic integrated circuits, Photonics West 2017, Proc. SPIE 10106, Integrated Optics: Devices, Materials, and Technologies XXI (invited), United States, p.101060T (2017)  Download this Publication (1.6MB).
    5. R. Baets, Brillouin and Raman scattering in silicon and silicon nitride photonic integrated circuits, 17th International Conference Laser Optics 2016 (invited), Russia, (2016).
    6. S. Clemmen, H. Zhao, F. Peyskens, A. Dhakal, P.C. Wuytens, A. Subramanian, N. Le Thomas, R. Baets, Coherent anti-Stokes Raman spectroscopy on chip, 28th IEEE Photonics Conference (IPC 2015) (invited), United States, p.623 (2015).
    7. S. Clemmen, H. Zhao, F. Peyskens, A. Dhakal, P.C. Wuytens, A. Subramanian, N. Le Thomas, R. Baets, Coherent anti-Stokes Raman spectroscopy on chip, 28th IEEE Photonics Conference (IPC 2015), United States, p.623-624 (2015)  Download this Publication (169KB).
    8. A. Dhakal, F. Peyskens, A. Subramanian, N. Le Thomas, R. Baets, Enhanced Spontaneous Raman Signal Collected Evanescently by Silicon Nitride Slot Waveguides, CLEO: 2015 - Laser Science to Photonic Applications, United States, p.paper STh4H.3 (2015).
    9. P.C. Wuytens, A. M. Yashchenok, A. Subramanian, R. Baets, A. G. Skirtach, Label-free monitoring of microcapsule-enabled intracellular release using gold-nanoparticle coated microchips , International Conference on Raman Spectroscopy, Germany, p.Mop-HS4-1 (2014).
    10. P.C. Wuytens, A. M. Yashchenok, A. Subramanian, R. Baets, A.G. Skirtach, Label-free monitoring of microcapsule-enabled intracellular release using goldnanoparticle coated microchips, Surface Enhanced Spectroscopies 2014, Germany, p.158 (2014)  Download this Publication (1.4MB).
        National Conferences

      1. P.C. Wuytens, A. Raza, H. Zhao, N. Turk, F. Peyskens, X. Nie, A. Dhakal, E.M.P. Ryckeboer, S. Clemmen, N. Le Thomas, R. Baets, On-chip Raman Spectroscopy, FEA Research Syposium 2017, Belgium, (2017)  Download this Publication (5MB).

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